Mercurial > hg > CbC > CbC_gcc
annotate gcc/config/mmix/mmix.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Definitions of target machine for GNU compiler, for MMIX. |
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2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
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3 2010 |
| 0 | 4 Free Software Foundation, Inc. |
| 5 Contributed by Hans-Peter Nilsson (hp@bitrange.com) | |
| 6 | |
| 7 This file is part of GCC. | |
| 8 | |
| 9 GCC is free software; you can redistribute it and/or modify | |
| 10 it under the terms of the GNU General Public License as published by | |
| 11 the Free Software Foundation; either version 3, or (at your option) | |
| 12 any later version. | |
| 13 | |
| 14 GCC is distributed in the hope that it will be useful, | |
| 15 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 GNU General Public License for more details. | |
| 18 | |
| 19 You should have received a copy of the GNU General Public License | |
| 20 along with GCC; see the file COPYING3. If not see | |
| 21 <http://www.gnu.org/licenses/>. */ | |
| 22 | |
| 23 #include "config.h" | |
| 24 #include "system.h" | |
| 25 #include "coretypes.h" | |
| 26 #include "tm.h" | |
| 27 #include "rtl.h" | |
| 28 #include "regs.h" | |
| 29 #include "hard-reg-set.h" | |
| 30 #include "hashtab.h" | |
| 31 #include "insn-config.h" | |
| 32 #include "output.h" | |
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33 #include "basic-block.h" |
| 0 | 34 #include "flags.h" |
| 35 #include "tree.h" | |
| 36 #include "function.h" | |
| 37 #include "expr.h" | |
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38 #include "diagnostic-core.h" |
| 0 | 39 #include "recog.h" |
| 40 #include "ggc.h" | |
| 41 #include "dwarf2.h" | |
| 42 #include "debug.h" | |
| 43 #include "tm_p.h" | |
| 44 #include "integrate.h" | |
| 45 #include "target.h" | |
| 46 #include "target-def.h" | |
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47 #include "df.h" |
| 0 | 48 |
| 49 /* First some local helper definitions. */ | |
| 50 #define MMIX_FIRST_GLOBAL_REGNUM 32 | |
| 51 | |
| 52 /* We'd need a current_function_has_landing_pad. It's marked as such when | |
| 53 a nonlocal_goto_receiver is expanded. Not just a C++ thing, but | |
| 54 mostly. */ | |
| 55 #define MMIX_CFUN_HAS_LANDING_PAD (cfun->machine->has_landing_pad != 0) | |
| 56 | |
| 57 /* We have no means to tell DWARF 2 about the register stack, so we need | |
| 58 to store the return address on the stack if an exception can get into | |
| 59 this function. FIXME: Narrow condition. Before any whole-function | |
| 60 analysis, df_regs_ever_live_p () isn't initialized. We know it's up-to-date | |
| 61 after reload_completed; it may contain incorrect information some time | |
| 62 before that. Within a RTL sequence (after a call to start_sequence, | |
| 63 such as in RTL expanders), leaf_function_p doesn't see all insns | |
| 64 (perhaps any insn). But regs_ever_live is up-to-date when | |
| 65 leaf_function_p () isn't, so we "or" them together to get accurate | |
| 66 information. FIXME: Some tweak to leaf_function_p might be | |
| 67 preferable. */ | |
| 68 #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS \ | |
| 69 (flag_exceptions \ | |
| 70 && ((reload_completed && df_regs_ever_live_p (MMIX_rJ_REGNUM)) \ | |
| 71 || !leaf_function_p ())) | |
| 72 | |
| 73 #define IS_MMIX_EH_RETURN_DATA_REG(REGNO) \ | |
| 74 (crtl->calls_eh_return \ | |
| 75 && (EH_RETURN_DATA_REGNO (0) == REGNO \ | |
| 76 || EH_RETURN_DATA_REGNO (1) == REGNO \ | |
| 77 || EH_RETURN_DATA_REGNO (2) == REGNO \ | |
| 78 || EH_RETURN_DATA_REGNO (3) == REGNO)) | |
| 79 | |
| 80 /* For the default ABI, we rename registers at output-time to fill the gap | |
| 81 between the (statically partitioned) saved registers and call-clobbered | |
| 82 registers. In effect this makes unused call-saved registers to be used | |
| 83 as call-clobbered registers. The benefit comes from keeping the number | |
| 84 of local registers (value of rL) low, since there's a cost of | |
| 85 increasing rL and clearing unused (unset) registers with lower numbers. | |
| 86 Don't translate while outputting the prologue. */ | |
| 87 #define MMIX_OUTPUT_REGNO(N) \ | |
| 88 (TARGET_ABI_GNU \ | |
| 89 || (int) (N) < MMIX_RETURN_VALUE_REGNUM \ | |
| 90 || (int) (N) > MMIX_LAST_STACK_REGISTER_REGNUM \ | |
| 91 || cfun == NULL \ | |
| 92 || cfun->machine == NULL \ | |
| 93 || cfun->machine->in_prologue \ | |
| 94 ? (N) : ((N) - MMIX_RETURN_VALUE_REGNUM \ | |
| 95 + cfun->machine->highest_saved_stack_register + 1)) | |
| 96 | |
| 97 /* The %d in "POP %d,0". */ | |
| 98 #define MMIX_POP_ARGUMENT() \ | |
| 99 ((! TARGET_ABI_GNU \ | |
| 100 && crtl->return_rtx != NULL \ | |
| 101 && ! cfun->returns_struct) \ | |
| 102 ? (GET_CODE (crtl->return_rtx) == PARALLEL \ | |
| 103 ? GET_NUM_ELEM (XVEC (crtl->return_rtx, 0)) : 1) \ | |
| 104 : 0) | |
| 105 | |
| 106 /* The canonical saved comparison operands for non-cc0 machines, set in | |
| 107 the compare expander. */ | |
| 108 rtx mmix_compare_op0; | |
| 109 rtx mmix_compare_op1; | |
| 110 | |
| 111 /* Declarations of locals. */ | |
| 112 | |
| 113 /* Intermediate for insn output. */ | |
| 114 static int mmix_output_destination_register; | |
| 115 | |
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116 static void mmix_option_override (void); |
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117 static void mmix_asm_output_source_filename (FILE *, const char *); |
| 0 | 118 static void mmix_output_shiftvalue_op_from_str |
| 119 (FILE *, const char *, HOST_WIDEST_INT); | |
| 120 static void mmix_output_shifted_value (FILE *, HOST_WIDEST_INT); | |
| 121 static void mmix_output_condition (FILE *, rtx, int); | |
| 122 static HOST_WIDEST_INT mmix_intval (rtx); | |
| 123 static void mmix_output_octa (FILE *, HOST_WIDEST_INT, int); | |
| 124 static bool mmix_assemble_integer (rtx, unsigned int, int); | |
| 125 static struct machine_function *mmix_init_machine_status (void); | |
| 126 static void mmix_encode_section_info (tree, rtx, int); | |
| 127 static const char *mmix_strip_name_encoding (const char *); | |
| 128 static void mmix_emit_sp_add (HOST_WIDE_INT offset); | |
| 129 static void mmix_target_asm_function_prologue (FILE *, HOST_WIDE_INT); | |
| 130 static void mmix_target_asm_function_end_prologue (FILE *); | |
| 131 static void mmix_target_asm_function_epilogue (FILE *, HOST_WIDE_INT); | |
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132 static bool mmix_legitimate_address_p (enum machine_mode, rtx, bool); |
| 0 | 133 static void mmix_reorg (void); |
| 134 static void mmix_asm_output_mi_thunk | |
| 135 (FILE *, tree, HOST_WIDE_INT, HOST_WIDE_INT, tree); | |
| 136 static void mmix_setup_incoming_varargs | |
| 137 (CUMULATIVE_ARGS *, enum machine_mode, tree, int *, int); | |
| 138 static void mmix_file_start (void); | |
| 139 static void mmix_file_end (void); | |
| 140 static bool mmix_rtx_costs (rtx, int, int, int *, bool); | |
| 141 static rtx mmix_struct_value_rtx (tree, int); | |
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142 static enum machine_mode mmix_promote_function_mode (const_tree, |
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143 enum machine_mode, |
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144 int *, const_tree, int); |
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145 static void mmix_function_arg_advance (CUMULATIVE_ARGS *, enum machine_mode, |
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146 const_tree, bool); |
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147 static rtx mmix_function_arg_1 (const CUMULATIVE_ARGS *, enum machine_mode, |
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148 const_tree, bool, bool); |
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149 static rtx mmix_function_incoming_arg (CUMULATIVE_ARGS *, enum machine_mode, |
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150 const_tree, bool); |
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151 static rtx mmix_function_arg (CUMULATIVE_ARGS *, enum machine_mode, |
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152 const_tree, bool); |
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153 static rtx mmix_function_value (const_tree, const_tree, bool); |
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154 static rtx mmix_libcall_value (enum machine_mode, const_rtx); |
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155 static bool mmix_function_value_regno_p (const unsigned int); |
| 0 | 156 static bool mmix_pass_by_reference (CUMULATIVE_ARGS *, |
| 157 enum machine_mode, const_tree, bool); | |
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158 static bool mmix_frame_pointer_required (void); |
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159 static void mmix_asm_trampoline_template (FILE *); |
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160 static void mmix_trampoline_init (rtx, tree, rtx); |
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161 static void mmix_conditional_register_usage (void); |
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162 |
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163 /* TARGET_OPTION_OPTIMIZATION_TABLE. */ |
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164 |
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165 static const struct default_options mmix_option_optimization_table[] = |
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166 { |
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167 { OPT_LEVELS_1_PLUS, OPT_fregmove, NULL, 1 }, |
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168 { OPT_LEVELS_2_PLUS, OPT_fomit_frame_pointer, NULL, 1 }, |
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169 { OPT_LEVELS_NONE, 0, NULL, 0 } |
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170 }; |
| 0 | 171 |
| 172 /* Target structure macros. Listed by node. See `Using and Porting GCC' | |
| 173 for a general description. */ | |
| 174 | |
| 175 /* Node: Function Entry */ | |
| 176 | |
| 177 #undef TARGET_ASM_BYTE_OP | |
| 178 #define TARGET_ASM_BYTE_OP NULL | |
| 179 #undef TARGET_ASM_ALIGNED_HI_OP | |
| 180 #define TARGET_ASM_ALIGNED_HI_OP NULL | |
| 181 #undef TARGET_ASM_ALIGNED_SI_OP | |
| 182 #define TARGET_ASM_ALIGNED_SI_OP NULL | |
| 183 #undef TARGET_ASM_ALIGNED_DI_OP | |
| 184 #define TARGET_ASM_ALIGNED_DI_OP NULL | |
| 185 #undef TARGET_ASM_INTEGER | |
| 186 #define TARGET_ASM_INTEGER mmix_assemble_integer | |
| 187 | |
| 188 #undef TARGET_ASM_FUNCTION_PROLOGUE | |
| 189 #define TARGET_ASM_FUNCTION_PROLOGUE mmix_target_asm_function_prologue | |
| 190 | |
| 191 #undef TARGET_ASM_FUNCTION_END_PROLOGUE | |
| 192 #define TARGET_ASM_FUNCTION_END_PROLOGUE mmix_target_asm_function_end_prologue | |
| 193 | |
| 194 #undef TARGET_ASM_FUNCTION_EPILOGUE | |
| 195 #define TARGET_ASM_FUNCTION_EPILOGUE mmix_target_asm_function_epilogue | |
| 196 | |
| 197 #undef TARGET_ENCODE_SECTION_INFO | |
| 198 #define TARGET_ENCODE_SECTION_INFO mmix_encode_section_info | |
| 199 #undef TARGET_STRIP_NAME_ENCODING | |
| 200 #define TARGET_STRIP_NAME_ENCODING mmix_strip_name_encoding | |
| 201 | |
| 202 #undef TARGET_ASM_OUTPUT_MI_THUNK | |
| 203 #define TARGET_ASM_OUTPUT_MI_THUNK mmix_asm_output_mi_thunk | |
| 204 #undef TARGET_ASM_CAN_OUTPUT_MI_THUNK | |
| 205 #define TARGET_ASM_CAN_OUTPUT_MI_THUNK default_can_output_mi_thunk_no_vcall | |
| 206 #undef TARGET_ASM_FILE_START | |
| 207 #define TARGET_ASM_FILE_START mmix_file_start | |
| 208 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE | |
| 209 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true | |
| 210 #undef TARGET_ASM_FILE_END | |
| 211 #define TARGET_ASM_FILE_END mmix_file_end | |
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212 #undef TARGET_ASM_OUTPUT_SOURCE_FILENAME |
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213 #define TARGET_ASM_OUTPUT_SOURCE_FILENAME mmix_asm_output_source_filename |
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214 |
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215 #undef TARGET_CONDITIONAL_REGISTER_USAGE |
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216 #define TARGET_CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage |
| 0 | 217 |
| 218 #undef TARGET_RTX_COSTS | |
| 219 #define TARGET_RTX_COSTS mmix_rtx_costs | |
| 220 #undef TARGET_ADDRESS_COST | |
| 221 #define TARGET_ADDRESS_COST hook_int_rtx_bool_0 | |
| 222 | |
| 223 #undef TARGET_MACHINE_DEPENDENT_REORG | |
| 224 #define TARGET_MACHINE_DEPENDENT_REORG mmix_reorg | |
| 225 | |
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226 #undef TARGET_PROMOTE_FUNCTION_MODE |
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227 #define TARGET_PROMOTE_FUNCTION_MODE mmix_promote_function_mode |
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228 |
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229 #undef TARGET_FUNCTION_VALUE |
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230 #define TARGET_FUNCTION_VALUE mmix_function_value |
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231 #undef TARGET_LIBCALL_VALUE |
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232 #define TARGET_LIBCALL_VALUE mmix_libcall_value |
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233 #undef TARGET_FUNCTION_VALUE_REGNO_P |
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234 #define TARGET_FUNCTION_VALUE_REGNO_P mmix_function_value_regno_p |
| 0 | 235 |
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236 #undef TARGET_FUNCTION_ARG |
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237 #define TARGET_FUNCTION_ARG mmix_function_arg |
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238 #undef TARGET_FUNCTION_INCOMING_ARG |
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239 #define TARGET_FUNCTION_INCOMING_ARG mmix_function_incoming_arg |
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240 #undef TARGET_FUNCTION_ARG_ADVANCE |
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241 #define TARGET_FUNCTION_ARG_ADVANCE mmix_function_arg_advance |
| 0 | 242 #undef TARGET_STRUCT_VALUE_RTX |
| 243 #define TARGET_STRUCT_VALUE_RTX mmix_struct_value_rtx | |
| 244 #undef TARGET_SETUP_INCOMING_VARARGS | |
| 245 #define TARGET_SETUP_INCOMING_VARARGS mmix_setup_incoming_varargs | |
| 246 #undef TARGET_PASS_BY_REFERENCE | |
| 247 #define TARGET_PASS_BY_REFERENCE mmix_pass_by_reference | |
| 248 #undef TARGET_CALLEE_COPIES | |
| 249 #define TARGET_CALLEE_COPIES hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true | |
| 250 #undef TARGET_DEFAULT_TARGET_FLAGS | |
| 251 #define TARGET_DEFAULT_TARGET_FLAGS TARGET_DEFAULT | |
| 252 | |
|
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253 #undef TARGET_LEGITIMATE_ADDRESS_P |
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254 #define TARGET_LEGITIMATE_ADDRESS_P mmix_legitimate_address_p |
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255 |
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256 #undef TARGET_FRAME_POINTER_REQUIRED |
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257 #define TARGET_FRAME_POINTER_REQUIRED mmix_frame_pointer_required |
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258 |
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259 #undef TARGET_ASM_TRAMPOLINE_TEMPLATE |
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260 #define TARGET_ASM_TRAMPOLINE_TEMPLATE mmix_asm_trampoline_template |
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261 #undef TARGET_TRAMPOLINE_INIT |
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262 #define TARGET_TRAMPOLINE_INIT mmix_trampoline_init |
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263 |
|
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264 #undef TARGET_OPTION_OVERRIDE |
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265 #define TARGET_OPTION_OVERRIDE mmix_option_override |
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266 #undef TARGET_OPTION_OPTIMIZATION_TABLE |
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267 #define TARGET_OPTION_OPTIMIZATION_TABLE mmix_option_optimization_table |
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268 |
| 0 | 269 struct gcc_target targetm = TARGET_INITIALIZER; |
| 270 | |
| 271 /* Functions that are expansions for target macros. | |
| 272 See Target Macros in `Using and Porting GCC'. */ | |
| 273 | |
|
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274 /* TARGET_OPTION_OVERRIDE. */ |
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275 |
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276 static void |
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277 mmix_option_override (void) |
| 0 | 278 { |
| 279 /* Should we err or should we warn? Hmm. At least we must neutralize | |
| 280 it. For example the wrong kind of case-tables will be generated with | |
| 281 PIC; we use absolute address items for mmixal compatibility. FIXME: | |
| 282 They could be relative if we just elide them to after all pertinent | |
| 283 labels. */ | |
| 284 if (flag_pic) | |
| 285 { | |
| 286 warning (0, "-f%s not supported: ignored", (flag_pic > 1) ? "PIC" : "pic"); | |
| 287 flag_pic = 0; | |
| 288 } | |
| 289 } | |
| 290 | |
| 291 /* INIT_EXPANDERS. */ | |
| 292 | |
| 293 void | |
| 294 mmix_init_expanders (void) | |
| 295 { | |
| 296 init_machine_status = mmix_init_machine_status; | |
| 297 } | |
| 298 | |
| 299 /* Set the per-function data. */ | |
| 300 | |
| 301 static struct machine_function * | |
| 302 mmix_init_machine_status (void) | |
| 303 { | |
|
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304 return ggc_alloc_cleared_machine_function (); |
| 0 | 305 } |
| 306 | |
| 307 /* DATA_ALIGNMENT. | |
| 308 We have trouble getting the address of stuff that is located at other | |
| 309 than 32-bit alignments (GETA requirements), so try to give everything | |
| 310 at least 32-bit alignment. */ | |
| 311 | |
| 312 int | |
| 313 mmix_data_alignment (tree type ATTRIBUTE_UNUSED, int basic_align) | |
| 314 { | |
| 315 if (basic_align < 32) | |
| 316 return 32; | |
| 317 | |
| 318 return basic_align; | |
| 319 } | |
| 320 | |
| 321 /* CONSTANT_ALIGNMENT. */ | |
| 322 | |
| 323 int | |
| 324 mmix_constant_alignment (tree constant ATTRIBUTE_UNUSED, int basic_align) | |
| 325 { | |
| 326 if (basic_align < 32) | |
| 327 return 32; | |
| 328 | |
| 329 return basic_align; | |
| 330 } | |
| 331 | |
| 332 /* LOCAL_ALIGNMENT. */ | |
| 333 | |
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334 unsigned |
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335 mmix_local_alignment (tree type ATTRIBUTE_UNUSED, unsigned basic_align) |
| 0 | 336 { |
| 337 if (basic_align < 32) | |
| 338 return 32; | |
| 339 | |
| 340 return basic_align; | |
| 341 } | |
| 342 | |
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343 /* TARGET_CONDITIONAL_REGISTER_USAGE. */ |
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344 |
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345 static void |
| 0 | 346 mmix_conditional_register_usage (void) |
| 347 { | |
| 348 int i; | |
| 349 | |
| 350 if (TARGET_ABI_GNU) | |
| 351 { | |
| 352 static const int gnu_abi_reg_alloc_order[] | |
| 353 = MMIX_GNU_ABI_REG_ALLOC_ORDER; | |
| 354 | |
| 355 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 356 reg_alloc_order[i] = gnu_abi_reg_alloc_order[i]; | |
| 357 | |
| 358 /* Change the default from the mmixware ABI. For the GNU ABI, | |
| 359 $15..$30 are call-saved just as $0..$14. There must be one | |
| 360 call-clobbered local register for the "hole" that holds the | |
| 361 number of saved local registers saved by PUSHJ/PUSHGO during the | |
| 362 function call, receiving the return value at return. So best is | |
| 363 to use the highest, $31. It's already marked call-clobbered for | |
| 364 the mmixware ABI. */ | |
| 365 for (i = 15; i <= 30; i++) | |
| 366 call_used_regs[i] = 0; | |
| 367 | |
| 368 /* "Unfix" the parameter registers. */ | |
| 369 for (i = MMIX_RESERVED_GNU_ARG_0_REGNUM; | |
| 370 i < MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS; | |
| 371 i++) | |
| 372 fixed_regs[i] = 0; | |
| 373 } | |
| 374 | |
| 375 /* Step over the ":" in special register names. */ | |
| 376 if (! TARGET_TOPLEVEL_SYMBOLS) | |
| 377 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 378 if (reg_names[i][0] == ':') | |
| 379 reg_names[i]++; | |
| 380 } | |
| 381 | |
| 382 /* INCOMING_REGNO and OUTGOING_REGNO worker function. | |
| 383 Those two macros must only be applied to function argument | |
| 384 registers. FIXME: for their current use in gcc, it'd be better | |
| 385 with an explicit specific additional FUNCTION_INCOMING_ARG_REGNO_P | |
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386 a'la TARGET_FUNCTION_ARG / TARGET_FUNCTION_INCOMING_ARG instead of |
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387 forcing the target to commit to a fixed mapping and for any |
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388 unspecified register use. */ |
| 0 | 389 |
| 390 int | |
| 391 mmix_opposite_regno (int regno, int incoming) | |
| 392 { | |
| 393 if (!mmix_function_arg_regno_p (regno, incoming)) | |
| 394 return regno; | |
| 395 | |
| 396 return | |
| 397 regno - (incoming | |
| 398 ? MMIX_FIRST_INCOMING_ARG_REGNUM - MMIX_FIRST_ARG_REGNUM | |
| 399 : MMIX_FIRST_ARG_REGNUM - MMIX_FIRST_INCOMING_ARG_REGNUM); | |
| 400 } | |
| 401 | |
| 402 /* LOCAL_REGNO. | |
| 403 All registers that are part of the register stack and that will be | |
| 404 saved are local. */ | |
| 405 | |
| 406 int | |
| 407 mmix_local_regno (int regno) | |
| 408 { | |
| 409 return regno <= MMIX_LAST_STACK_REGISTER_REGNUM && !call_used_regs[regno]; | |
| 410 } | |
| 411 | |
| 412 /* PREFERRED_RELOAD_CLASS. | |
| 413 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ | |
| 414 | |
| 415 enum reg_class | |
| 416 mmix_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, enum reg_class rclass) | |
| 417 { | |
| 418 /* FIXME: Revisit. */ | |
| 419 return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
| 420 ? REMAINDER_REG : rclass; | |
| 421 } | |
| 422 | |
| 423 /* PREFERRED_OUTPUT_RELOAD_CLASS. | |
| 424 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ | |
| 425 | |
| 426 enum reg_class | |
| 427 mmix_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED, | |
| 428 enum reg_class rclass) | |
| 429 { | |
| 430 /* FIXME: Revisit. */ | |
| 431 return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
| 432 ? REMAINDER_REG : rclass; | |
| 433 } | |
| 434 | |
| 435 /* SECONDARY_RELOAD_CLASS. | |
| 436 We need to reload regs of REMAINDER_REG and HIMULT_REG elsewhere. */ | |
| 437 | |
| 438 enum reg_class | |
| 439 mmix_secondary_reload_class (enum reg_class rclass, | |
| 440 enum machine_mode mode ATTRIBUTE_UNUSED, | |
| 441 rtx x ATTRIBUTE_UNUSED, | |
| 442 int in_p ATTRIBUTE_UNUSED) | |
| 443 { | |
| 444 if (rclass == REMAINDER_REG | |
| 445 || rclass == HIMULT_REG | |
| 446 || rclass == SYSTEM_REGS) | |
| 447 return GENERAL_REGS; | |
| 448 | |
| 449 return NO_REGS; | |
| 450 } | |
| 451 | |
| 452 /* CONST_OK_FOR_LETTER_P. */ | |
| 453 | |
| 454 int | |
| 455 mmix_const_ok_for_letter_p (HOST_WIDE_INT value, int c) | |
| 456 { | |
| 457 return | |
| 458 (c == 'I' ? value >= 0 && value <= 255 | |
| 459 : c == 'J' ? value >= 0 && value <= 65535 | |
| 460 : c == 'K' ? value <= 0 && value >= -255 | |
| 461 : c == 'L' ? mmix_shiftable_wyde_value (value) | |
| 462 : c == 'M' ? value == 0 | |
| 463 : c == 'N' ? mmix_shiftable_wyde_value (~value) | |
| 464 : c == 'O' ? (value == 3 || value == 5 || value == 9 | |
| 465 || value == 17) | |
| 466 : 0); | |
| 467 } | |
| 468 | |
| 469 /* CONST_DOUBLE_OK_FOR_LETTER_P. */ | |
| 470 | |
| 471 int | |
| 472 mmix_const_double_ok_for_letter_p (rtx value, int c) | |
| 473 { | |
| 474 return | |
| 475 (c == 'G' ? value == CONST0_RTX (GET_MODE (value)) | |
| 476 : 0); | |
| 477 } | |
| 478 | |
| 479 /* EXTRA_CONSTRAINT. | |
| 480 We need this since our constants are not always expressible as | |
| 481 CONST_INT:s, but rather often as CONST_DOUBLE:s. */ | |
| 482 | |
| 483 int | |
| 484 mmix_extra_constraint (rtx x, int c, int strict) | |
| 485 { | |
| 486 HOST_WIDEST_INT value; | |
| 487 | |
| 488 /* When checking for an address, we need to handle strict vs. non-strict | |
| 489 register checks. Don't use address_operand, but instead its | |
| 490 equivalent (its callee, which it is just a wrapper for), | |
| 491 memory_operand_p and the strict-equivalent strict_memory_address_p. */ | |
| 492 if (c == 'U') | |
| 493 return | |
| 494 strict | |
| 495 ? strict_memory_address_p (Pmode, x) | |
| 496 : memory_address_p (Pmode, x); | |
| 497 | |
| 498 /* R asks whether x is to be loaded with GETA or something else. Right | |
| 499 now, only a SYMBOL_REF and LABEL_REF can fit for | |
| 500 TARGET_BASE_ADDRESSES. | |
| 501 | |
| 502 Only constant symbolic addresses apply. With TARGET_BASE_ADDRESSES, | |
| 503 we just allow straight LABEL_REF or SYMBOL_REFs with SYMBOL_REF_FLAG | |
| 504 set right now; only function addresses and code labels. If we change | |
| 505 to let SYMBOL_REF_FLAG be set on other symbols, we have to check | |
| 506 inside CONST expressions. When TARGET_BASE_ADDRESSES is not in | |
| 507 effect, a "raw" constant check together with mmix_constant_address_p | |
| 508 is all that's needed; we want all constant addresses to be loaded | |
| 509 with GETA then. */ | |
| 510 if (c == 'R') | |
| 511 return | |
| 512 GET_CODE (x) != CONST_INT && GET_CODE (x) != CONST_DOUBLE | |
| 513 && mmix_constant_address_p (x) | |
| 514 && (! TARGET_BASE_ADDRESSES | |
| 515 || (GET_CODE (x) == LABEL_REF | |
| 516 || (GET_CODE (x) == SYMBOL_REF && SYMBOL_REF_FLAG (x)))); | |
| 517 | |
| 518 if (GET_CODE (x) != CONST_DOUBLE || GET_MODE (x) != VOIDmode) | |
| 519 return 0; | |
| 520 | |
| 521 value = mmix_intval (x); | |
| 522 | |
| 523 /* We used to map Q->J, R->K, S->L, T->N, U->O, but we don't have to any | |
| 524 more ('U' taken for address_operand, 'R' similarly). Some letters map | |
| 525 outside of CONST_INT, though; we still use 'S' and 'T'. */ | |
| 526 if (c == 'S') | |
| 527 return mmix_shiftable_wyde_value (value); | |
| 528 else if (c == 'T') | |
| 529 return mmix_shiftable_wyde_value (~value); | |
| 530 return 0; | |
| 531 } | |
| 532 | |
| 533 /* DYNAMIC_CHAIN_ADDRESS. */ | |
| 534 | |
| 535 rtx | |
| 536 mmix_dynamic_chain_address (rtx frame) | |
| 537 { | |
| 538 /* FIXME: the frame-pointer is stored at offset -8 from the current | |
| 539 frame-pointer. Unfortunately, the caller assumes that a | |
| 540 frame-pointer is present for *all* previous frames. There should be | |
| 541 a way to say that that cannot be done, like for RETURN_ADDR_RTX. */ | |
| 542 return plus_constant (frame, -8); | |
| 543 } | |
| 544 | |
| 545 /* STARTING_FRAME_OFFSET. */ | |
| 546 | |
| 547 int | |
| 548 mmix_starting_frame_offset (void) | |
| 549 { | |
| 550 /* The old frame pointer is in the slot below the new one, so | |
| 551 FIRST_PARM_OFFSET does not need to depend on whether the | |
| 552 frame-pointer is needed or not. We have to adjust for the register | |
| 553 stack pointer being located below the saved frame pointer. | |
| 554 Similarly, we store the return address on the stack too, for | |
| 555 exception handling, and always if we save the register stack pointer. */ | |
| 556 return | |
| 557 (-8 | |
| 558 + (MMIX_CFUN_HAS_LANDING_PAD | |
| 559 ? -16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? -8 : 0))); | |
| 560 } | |
| 561 | |
| 562 /* RETURN_ADDR_RTX. */ | |
| 563 | |
| 564 rtx | |
| 565 mmix_return_addr_rtx (int count, rtx frame ATTRIBUTE_UNUSED) | |
| 566 { | |
| 567 return count == 0 | |
| 568 ? (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS | |
| 569 /* FIXME: Set frame_alias_set on the following. (Why?) | |
| 570 See mmix_initial_elimination_offset for the reason we can't use | |
| 571 get_hard_reg_initial_val for both. Always using a stack slot | |
| 572 and not a register would be suboptimal. */ | |
| 573 ? validize_mem (gen_rtx_MEM (Pmode, plus_constant (frame_pointer_rtx, -16))) | |
| 574 : get_hard_reg_initial_val (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)) | |
| 575 : NULL_RTX; | |
| 576 } | |
| 577 | |
| 578 /* SETUP_FRAME_ADDRESSES. */ | |
| 579 | |
| 580 void | |
| 581 mmix_setup_frame_addresses (void) | |
| 582 { | |
| 583 /* Nothing needed at the moment. */ | |
| 584 } | |
| 585 | |
| 586 /* The difference between the (imaginary) frame pointer and the stack | |
| 587 pointer. Used to eliminate the frame pointer. */ | |
| 588 | |
| 589 int | |
| 590 mmix_initial_elimination_offset (int fromreg, int toreg) | |
| 591 { | |
| 592 int regno; | |
| 593 int fp_sp_offset | |
| 594 = (get_frame_size () + crtl->outgoing_args_size + 7) & ~7; | |
| 595 | |
| 596 /* There is no actual offset between these two virtual values, but for | |
| 597 the frame-pointer, we have the old one in the stack position below | |
| 598 it, so the offset for the frame-pointer to the stack-pointer is one | |
| 599 octabyte larger. */ | |
| 600 if (fromreg == MMIX_ARG_POINTER_REGNUM | |
| 601 && toreg == MMIX_FRAME_POINTER_REGNUM) | |
| 602 return 0; | |
| 603 | |
| 604 /* The difference is the size of local variables plus the size of | |
| 605 outgoing function arguments that would normally be passed as | |
| 606 registers but must be passed on stack because we're out of | |
| 607 function-argument registers. Only global saved registers are | |
| 608 counted; the others go on the register stack. | |
| 609 | |
| 610 The frame-pointer is counted too if it is what is eliminated, as we | |
| 611 need to balance the offset for it from STARTING_FRAME_OFFSET. | |
| 612 | |
| 613 Also add in the slot for the register stack pointer we save if we | |
| 614 have a landing pad. | |
| 615 | |
| 616 Unfortunately, we can't access $0..$14, from unwinder code easily, so | |
| 617 store the return address in a frame slot too. FIXME: Only for | |
| 618 non-leaf functions. FIXME: Always with a landing pad, because it's | |
| 619 hard to know whether we need the other at the time we know we need | |
| 620 the offset for one (and have to state it). It's a kludge until we | |
| 621 can express the register stack in the EH frame info. | |
| 622 | |
| 623 We have to do alignment here; get_frame_size will not return a | |
| 624 multiple of STACK_BOUNDARY. FIXME: Add note in manual. */ | |
| 625 | |
| 626 for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
| 627 regno <= 255; | |
| 628 regno++) | |
| 629 if ((df_regs_ever_live_p (regno) && ! call_used_regs[regno]) | |
| 630 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 631 fp_sp_offset += 8; | |
| 632 | |
| 633 return fp_sp_offset | |
| 634 + (MMIX_CFUN_HAS_LANDING_PAD | |
| 635 ? 16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? 8 : 0)) | |
| 636 + (fromreg == MMIX_ARG_POINTER_REGNUM ? 0 : 8); | |
| 637 } | |
| 638 | |
|
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639 static void |
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640 mmix_function_arg_advance (CUMULATIVE_ARGS *argsp, enum machine_mode mode, |
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641 const_tree type, bool named ATTRIBUTE_UNUSED) |
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642 { |
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643 int arg_size = MMIX_FUNCTION_ARG_SIZE (mode, type); |
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644 |
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645 argsp->regs = ((targetm.calls.must_pass_in_stack (mode, type) |
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646 || (arg_size > 8 |
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647 && !TARGET_LIBFUNC |
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648 && !argsp->lib)) |
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649 ? (MMIX_MAX_ARGS_IN_REGS) + 1 |
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650 : argsp->regs + (7 + arg_size) / 8); |
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651 } |
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652 |
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653 /* Helper function for mmix_function_arg and mmix_function_incoming_arg. */ |
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654 |
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655 static rtx |
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656 mmix_function_arg_1 (const CUMULATIVE_ARGS *argsp, |
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657 enum machine_mode mode, |
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658 const_tree type, |
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659 bool named ATTRIBUTE_UNUSED, |
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660 bool incoming) |
| 0 | 661 { |
| 662 /* Last-argument marker. */ | |
| 663 if (type == void_type_node) | |
| 664 return (argsp->regs < MMIX_MAX_ARGS_IN_REGS) | |
| 665 ? gen_rtx_REG (mode, | |
| 666 (incoming | |
| 667 ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
| 668 : MMIX_FIRST_ARG_REGNUM) + argsp->regs) | |
| 669 : NULL_RTX; | |
| 670 | |
| 671 return (argsp->regs < MMIX_MAX_ARGS_IN_REGS | |
| 672 && !targetm.calls.must_pass_in_stack (mode, type) | |
| 673 && (GET_MODE_BITSIZE (mode) <= 64 | |
| 674 || argsp->lib | |
| 675 || TARGET_LIBFUNC)) | |
| 676 ? gen_rtx_REG (mode, | |
| 677 (incoming | |
| 678 ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
| 679 : MMIX_FIRST_ARG_REGNUM) | |
| 680 + argsp->regs) | |
| 681 : NULL_RTX; | |
| 682 } | |
| 683 | |
|
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684 /* Return an rtx for a function argument to go in a register, and 0 for |
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685 one that must go on stack. */ |
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686 |
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687 static rtx |
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688 mmix_function_arg (CUMULATIVE_ARGS *argsp, |
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689 enum machine_mode mode, |
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690 const_tree type, |
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691 bool named) |
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692 { |
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693 return mmix_function_arg_1 (argsp, mode, type, named, false); |
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694 } |
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695 |
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696 static rtx |
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697 mmix_function_incoming_arg (CUMULATIVE_ARGS *argsp, |
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698 enum machine_mode mode, |
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699 const_tree type, |
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700 bool named) |
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701 { |
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702 return mmix_function_arg_1 (argsp, mode, type, named, true); |
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703 } |
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704 |
| 0 | 705 /* Returns nonzero for everything that goes by reference, 0 for |
| 706 everything that goes by value. */ | |
| 707 | |
| 708 static bool | |
| 709 mmix_pass_by_reference (CUMULATIVE_ARGS *argsp, enum machine_mode mode, | |
| 710 const_tree type, bool named ATTRIBUTE_UNUSED) | |
| 711 { | |
| 712 /* FIXME: Check: I'm not sure the must_pass_in_stack check is | |
| 713 necessary. */ | |
| 714 if (targetm.calls.must_pass_in_stack (mode, type)) | |
| 715 return true; | |
| 716 | |
| 717 if (MMIX_FUNCTION_ARG_SIZE (mode, type) > 8 | |
| 718 && !TARGET_LIBFUNC | |
| 719 && (!argsp || !argsp->lib)) | |
| 720 return true; | |
| 721 | |
| 722 return false; | |
| 723 } | |
| 724 | |
| 725 /* Return nonzero if regno is a register number where a parameter is | |
| 726 passed, and 0 otherwise. */ | |
| 727 | |
| 728 int | |
| 729 mmix_function_arg_regno_p (int regno, int incoming) | |
| 730 { | |
| 731 int first_arg_regnum | |
| 732 = incoming ? MMIX_FIRST_INCOMING_ARG_REGNUM : MMIX_FIRST_ARG_REGNUM; | |
| 733 | |
| 734 return regno >= first_arg_regnum | |
| 735 && regno < first_arg_regnum + MMIX_MAX_ARGS_IN_REGS; | |
| 736 } | |
| 737 | |
|
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738 /* Implements TARGET_FUNCTION_VALUE. */ |
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739 |
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740 static rtx |
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741 mmix_function_value (const_tree valtype, |
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742 const_tree func ATTRIBUTE_UNUSED, |
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743 bool outgoing) |
| 0 | 744 { |
| 745 enum machine_mode mode = TYPE_MODE (valtype); | |
| 746 enum machine_mode cmode; | |
| 747 int first_val_regnum = MMIX_OUTGOING_RETURN_VALUE_REGNUM; | |
| 748 rtx vec[MMIX_MAX_REGS_FOR_VALUE]; | |
| 749 int i; | |
| 750 int nregs; | |
| 751 | |
|
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752 if (!outgoing) |
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753 return gen_rtx_REG (mode, MMIX_RETURN_VALUE_REGNUM); |
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754 |
| 0 | 755 /* Return values that fit in a register need no special handling. |
| 756 There's no register hole when parameters are passed in global | |
| 757 registers. */ | |
| 758 if (TARGET_ABI_GNU | |
| 759 || GET_MODE_BITSIZE (mode) <= BITS_PER_WORD) | |
| 760 return | |
| 761 gen_rtx_REG (mode, MMIX_OUTGOING_RETURN_VALUE_REGNUM); | |
| 762 | |
| 763 if (COMPLEX_MODE_P (mode)) | |
| 764 /* A complex type, made up of components. */ | |
| 765 cmode = TYPE_MODE (TREE_TYPE (valtype)); | |
| 766 else | |
| 767 { | |
| 768 /* Of the other larger-than-register modes, we only support | |
| 769 scalar mode TImode. (At least, that's the only one that's | |
| 770 been rudimentally tested.) Make sure we're alerted for | |
| 771 unexpected cases. */ | |
| 772 if (mode != TImode) | |
| 773 sorry ("support for mode %qs", GET_MODE_NAME (mode)); | |
| 774 | |
| 775 /* In any case, we will fill registers to the natural size. */ | |
| 776 cmode = DImode; | |
| 777 } | |
| 778 | |
| 779 nregs = ((GET_MODE_BITSIZE (mode) + BITS_PER_WORD - 1) / BITS_PER_WORD); | |
| 780 | |
| 781 /* We need to take care of the effect of the register hole on return | |
| 782 values of large sizes; the last register will appear as the first | |
| 783 register, with the rest shifted. (For complex modes, this is just | |
| 784 swapped registers.) */ | |
| 785 | |
| 786 if (nregs > MMIX_MAX_REGS_FOR_VALUE) | |
| 787 internal_error ("too large function value type, needs %d registers,\ | |
| 788 have only %d registers for this", nregs, MMIX_MAX_REGS_FOR_VALUE); | |
| 789 | |
| 790 /* FIXME: Maybe we should handle structure values like this too | |
| 791 (adjusted for BLKmode), perhaps for both ABI:s. */ | |
| 792 for (i = 0; i < nregs - 1; i++) | |
| 793 vec[i] | |
| 794 = gen_rtx_EXPR_LIST (VOIDmode, | |
| 795 gen_rtx_REG (cmode, first_val_regnum + i), | |
| 796 GEN_INT ((i + 1) * BITS_PER_UNIT)); | |
| 797 | |
| 798 vec[nregs - 1] | |
| 799 = gen_rtx_EXPR_LIST (VOIDmode, | |
| 800 gen_rtx_REG (cmode, first_val_regnum + nregs - 1), | |
| 801 const0_rtx); | |
| 802 | |
| 803 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nregs, vec)); | |
| 804 } | |
| 805 | |
|
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806 /* Implements TARGET_LIBCALL_VALUE. */ |
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807 |
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808 static rtx |
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809 mmix_libcall_value (enum machine_mode mode, |
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810 const_rtx fun ATTRIBUTE_UNUSED) |
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811 { |
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812 return gen_rtx_REG (mode, MMIX_RETURN_VALUE_REGNUM); |
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813 } |
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814 |
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815 /* Implements TARGET_FUNCTION_VALUE_REGNO_P. */ |
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816 |
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817 static bool |
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818 mmix_function_value_regno_p (const unsigned int regno) |
| 0 | 819 { |
| 820 return regno == MMIX_RETURN_VALUE_REGNUM; | |
| 821 } | |
| 822 | |
| 823 /* EH_RETURN_DATA_REGNO. */ | |
| 824 | |
| 825 int | |
| 826 mmix_eh_return_data_regno (int n) | |
| 827 { | |
| 828 if (n >= 0 && n < 4) | |
| 829 return MMIX_EH_RETURN_DATA_REGNO_START + n; | |
| 830 | |
| 831 return INVALID_REGNUM; | |
| 832 } | |
| 833 | |
| 834 /* EH_RETURN_STACKADJ_RTX. */ | |
| 835 | |
| 836 rtx | |
| 837 mmix_eh_return_stackadj_rtx (void) | |
| 838 { | |
| 839 return gen_rtx_REG (Pmode, MMIX_EH_RETURN_STACKADJ_REGNUM); | |
| 840 } | |
| 841 | |
| 842 /* EH_RETURN_HANDLER_RTX. */ | |
| 843 | |
| 844 rtx | |
| 845 mmix_eh_return_handler_rtx (void) | |
| 846 { | |
| 847 return gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM); | |
| 848 } | |
| 849 | |
| 850 /* ASM_PREFERRED_EH_DATA_FORMAT. */ | |
| 851 | |
| 852 int | |
| 853 mmix_asm_preferred_eh_data_format (int code ATTRIBUTE_UNUSED, | |
| 854 int global ATTRIBUTE_UNUSED) | |
| 855 { | |
| 856 /* This is the default (was at 2001-07-20). Revisit when needed. */ | |
| 857 return DW_EH_PE_absptr; | |
| 858 } | |
| 859 | |
| 860 /* Make a note that we've seen the beginning of the prologue. This | |
| 861 matters to whether we'll translate register numbers as calculated by | |
| 862 mmix_reorg. */ | |
| 863 | |
| 864 static void | |
| 865 mmix_target_asm_function_prologue (FILE *stream ATTRIBUTE_UNUSED, | |
| 866 HOST_WIDE_INT framesize ATTRIBUTE_UNUSED) | |
| 867 { | |
| 868 cfun->machine->in_prologue = 1; | |
| 869 } | |
| 870 | |
| 871 /* Make a note that we've seen the end of the prologue. */ | |
| 872 | |
| 873 static void | |
| 874 mmix_target_asm_function_end_prologue (FILE *stream ATTRIBUTE_UNUSED) | |
| 875 { | |
| 876 cfun->machine->in_prologue = 0; | |
| 877 } | |
| 878 | |
| 879 /* Implement TARGET_MACHINE_DEPENDENT_REORG. No actual rearrangements | |
| 880 done here; just virtually by calculating the highest saved stack | |
| 881 register number used to modify the register numbers at output time. */ | |
| 882 | |
| 883 static void | |
| 884 mmix_reorg (void) | |
| 885 { | |
| 886 int regno; | |
| 887 | |
| 888 /* We put the number of the highest saved register-file register in a | |
| 889 location convenient for the call-patterns to output. Note that we | |
| 890 don't tell dwarf2 about these registers, since it can't restore them | |
| 891 anyway. */ | |
| 892 for (regno = MMIX_LAST_STACK_REGISTER_REGNUM; | |
| 893 regno >= 0; | |
| 894 regno--) | |
| 895 if ((df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
| 896 || (regno == MMIX_FRAME_POINTER_REGNUM && frame_pointer_needed)) | |
| 897 break; | |
| 898 | |
| 899 /* Regardless of whether they're saved (they might be just read), we | |
| 900 mustn't include registers that carry parameters. We could scan the | |
| 901 insns to see whether they're actually used (and indeed do other less | |
| 902 trivial register usage analysis and transformations), but it seems | |
| 903 wasteful to optimize for unused parameter registers. As of | |
| 904 2002-04-30, df_regs_ever_live_p (n) seems to be set for only-reads too, but | |
| 905 that might change. */ | |
| 906 if (!TARGET_ABI_GNU && regno < crtl->args.info.regs - 1) | |
| 907 { | |
| 908 regno = crtl->args.info.regs - 1; | |
| 909 | |
| 910 /* We don't want to let this cause us to go over the limit and make | |
| 911 incoming parameter registers be misnumbered and treating the last | |
| 912 parameter register and incoming return value register call-saved. | |
| 913 Stop things at the unmodified scheme. */ | |
| 914 if (regno > MMIX_RETURN_VALUE_REGNUM - 1) | |
| 915 regno = MMIX_RETURN_VALUE_REGNUM - 1; | |
| 916 } | |
| 917 | |
| 918 cfun->machine->highest_saved_stack_register = regno; | |
| 919 } | |
| 920 | |
| 921 /* TARGET_ASM_FUNCTION_EPILOGUE. */ | |
| 922 | |
| 923 static void | |
| 924 mmix_target_asm_function_epilogue (FILE *stream, | |
| 925 HOST_WIDE_INT locals_size ATTRIBUTE_UNUSED) | |
| 926 { | |
| 927 /* Emit an \n for readability of the generated assembly. */ | |
| 928 fputc ('\n', stream); | |
| 929 } | |
| 930 | |
| 931 /* TARGET_ASM_OUTPUT_MI_THUNK. */ | |
| 932 | |
| 933 static void | |
| 934 mmix_asm_output_mi_thunk (FILE *stream, | |
| 935 tree fndecl ATTRIBUTE_UNUSED, | |
| 936 HOST_WIDE_INT delta, | |
| 937 HOST_WIDE_INT vcall_offset ATTRIBUTE_UNUSED, | |
| 938 tree func) | |
| 939 { | |
| 940 /* If you define TARGET_STRUCT_VALUE_RTX that returns 0 (i.e. pass | |
| 941 location of structure to return as invisible first argument), you | |
| 942 need to tweak this code too. */ | |
| 943 const char *regname = reg_names[MMIX_FIRST_INCOMING_ARG_REGNUM]; | |
| 944 | |
| 945 if (delta >= 0 && delta < 65536) | |
| 946 fprintf (stream, "\tINCL %s,%d\n", regname, (int)delta); | |
| 947 else if (delta < 0 && delta >= -255) | |
| 948 fprintf (stream, "\tSUBU %s,%s,%d\n", regname, regname, (int)-delta); | |
| 949 else | |
| 950 { | |
| 951 mmix_output_register_setting (stream, 255, delta, 1); | |
| 952 fprintf (stream, "\tADDU %s,%s,$255\n", regname, regname); | |
| 953 } | |
| 954 | |
| 955 fprintf (stream, "\tJMP "); | |
| 956 assemble_name (stream, XSTR (XEXP (DECL_RTL (func), 0), 0)); | |
| 957 fprintf (stream, "\n"); | |
| 958 } | |
| 959 | |
| 960 /* FUNCTION_PROFILER. */ | |
| 961 | |
| 962 void | |
| 963 mmix_function_profiler (FILE *stream ATTRIBUTE_UNUSED, | |
| 964 int labelno ATTRIBUTE_UNUSED) | |
| 965 { | |
| 966 sorry ("function_profiler support for MMIX"); | |
| 967 } | |
| 968 | |
| 969 /* Worker function for TARGET_SETUP_INCOMING_VARARGS. For the moment, | |
| 970 let's stick to pushing argument registers on the stack. Later, we | |
| 971 can parse all arguments in registers, to improve performance. */ | |
| 972 | |
| 973 static void | |
| 974 mmix_setup_incoming_varargs (CUMULATIVE_ARGS *args_so_farp, | |
| 975 enum machine_mode mode, | |
| 976 tree vartype, | |
| 977 int *pretend_sizep, | |
| 978 int second_time ATTRIBUTE_UNUSED) | |
| 979 { | |
| 980 /* The last named variable has been handled, but | |
| 981 args_so_farp has not been advanced for it. */ | |
| 982 if (args_so_farp->regs + 1 < MMIX_MAX_ARGS_IN_REGS) | |
| 983 *pretend_sizep = (MMIX_MAX_ARGS_IN_REGS - (args_so_farp->regs + 1)) * 8; | |
| 984 | |
| 985 /* We assume that one argument takes up one register here. That should | |
| 986 be true until we start messing with multi-reg parameters. */ | |
| 987 if ((7 + (MMIX_FUNCTION_ARG_SIZE (mode, vartype))) / 8 != 1) | |
| 988 internal_error ("MMIX Internal: Last named vararg would not fit in a register"); | |
| 989 } | |
| 990 | |
|
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991 /* TARGET_ASM_TRAMPOLINE_TEMPLATE. */ |
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992 |
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993 static void |
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994 mmix_asm_trampoline_template (FILE *stream) |
| 0 | 995 { |
| 996 /* Read a value into the static-chain register and jump somewhere. The | |
| 997 static chain is stored at offset 16, and the function address is | |
| 998 stored at offset 24. */ | |
|
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999 |
| 0 | 1000 fprintf (stream, "\tGETA $255,1F\n\t"); |
|
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1001 fprintf (stream, "LDOU %s,$255,0\n\t", reg_names[MMIX_STATIC_CHAIN_REGNUM]); |
| 0 | 1002 fprintf (stream, "LDOU $255,$255,8\n\t"); |
| 1003 fprintf (stream, "GO $255,$255,0\n"); | |
| 1004 fprintf (stream, "1H\tOCTA 0\n\t"); | |
| 1005 fprintf (stream, "OCTA 0\n"); | |
| 1006 } | |
| 1007 | |
|
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1008 /* TARGET_TRAMPOLINE_INIT. */ |
| 0 | 1009 /* Set the static chain and function pointer field in the trampoline. |
| 1010 We also SYNCID here to be sure (doesn't matter in the simulator, but | |
| 1011 some day it will). */ | |
| 1012 | |
|
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1013 static void |
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1014 mmix_trampoline_init (rtx m_tramp, tree fndecl, rtx static_chain) |
| 0 | 1015 { |
|
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1016 rtx fnaddr = XEXP (DECL_RTL (fndecl), 0); |
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1017 rtx mem; |
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1018 |
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1019 emit_block_move (m_tramp, assemble_trampoline_template (), |
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1020 GEN_INT (2*UNITS_PER_WORD), BLOCK_OP_NORMAL); |
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1021 |
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1022 mem = adjust_address (m_tramp, DImode, 2*UNITS_PER_WORD); |
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1023 emit_move_insn (mem, static_chain); |
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1024 mem = adjust_address (m_tramp, DImode, 3*UNITS_PER_WORD); |
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1025 emit_move_insn (mem, fnaddr); |
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1026 |
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1027 mem = adjust_address (m_tramp, DImode, 0); |
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1028 emit_insn (gen_sync_icache (mem, GEN_INT (TRAMPOLINE_SIZE - 1))); |
| 0 | 1029 } |
| 1030 | |
| 1031 /* We must exclude constant addresses that have an increment that is not a | |
| 1032 multiple of four bytes because of restrictions of the GETA | |
| 1033 instruction, unless TARGET_BASE_ADDRESSES. */ | |
| 1034 | |
| 1035 int | |
| 1036 mmix_constant_address_p (rtx x) | |
| 1037 { | |
| 1038 RTX_CODE code = GET_CODE (x); | |
| 1039 int addend = 0; | |
| 1040 /* When using "base addresses", anything constant goes. */ | |
| 1041 int constant_ok = TARGET_BASE_ADDRESSES != 0; | |
| 1042 | |
| 1043 switch (code) | |
| 1044 { | |
| 1045 case LABEL_REF: | |
| 1046 case SYMBOL_REF: | |
| 1047 return 1; | |
| 1048 | |
| 1049 case HIGH: | |
| 1050 /* FIXME: Don't know how to dissect these. Avoid them for now, | |
| 1051 except we know they're constants. */ | |
| 1052 return constant_ok; | |
| 1053 | |
| 1054 case CONST_INT: | |
| 1055 addend = INTVAL (x); | |
| 1056 break; | |
| 1057 | |
| 1058 case CONST_DOUBLE: | |
| 1059 if (GET_MODE (x) != VOIDmode) | |
| 1060 /* Strange that we got here. FIXME: Check if we do. */ | |
| 1061 return constant_ok; | |
| 1062 addend = CONST_DOUBLE_LOW (x); | |
| 1063 break; | |
| 1064 | |
| 1065 case CONST: | |
| 1066 /* Note that expressions with arithmetic on forward references don't | |
| 1067 work in mmixal. People using gcc assembly code with mmixal might | |
| 1068 need to move arrays and such to before the point of use. */ | |
| 1069 if (GET_CODE (XEXP (x, 0)) == PLUS) | |
| 1070 { | |
| 1071 rtx x0 = XEXP (XEXP (x, 0), 0); | |
| 1072 rtx x1 = XEXP (XEXP (x, 0), 1); | |
| 1073 | |
| 1074 if ((GET_CODE (x0) == SYMBOL_REF | |
| 1075 || GET_CODE (x0) == LABEL_REF) | |
| 1076 && (GET_CODE (x1) == CONST_INT | |
| 1077 || (GET_CODE (x1) == CONST_DOUBLE | |
| 1078 && GET_MODE (x1) == VOIDmode))) | |
| 1079 addend = mmix_intval (x1); | |
| 1080 else | |
| 1081 return constant_ok; | |
| 1082 } | |
| 1083 else | |
| 1084 return constant_ok; | |
| 1085 break; | |
| 1086 | |
| 1087 default: | |
| 1088 return 0; | |
| 1089 } | |
| 1090 | |
| 1091 return constant_ok || (addend & 3) == 0; | |
| 1092 } | |
| 1093 | |
|
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1094 /* Return 1 if the address is OK, otherwise 0. */ |
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1095 |
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1096 bool |
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1097 mmix_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED, |
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1098 rtx x, |
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1099 bool strict_checking) |
| 0 | 1100 { |
| 1101 #define MMIX_REG_OK(X) \ | |
| 1102 ((strict_checking \ | |
| 1103 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
| 1104 || (reg_renumber[REGNO (X)] > 0 \ | |
| 1105 && reg_renumber[REGNO (X)] <= MMIX_LAST_GENERAL_REGISTER))) \ | |
| 1106 || (!strict_checking \ | |
| 1107 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
| 1108 || REGNO (X) >= FIRST_PSEUDO_REGISTER \ | |
| 1109 || REGNO (X) == ARG_POINTER_REGNUM))) | |
| 1110 | |
| 1111 /* We only accept: | |
| 1112 (mem reg) | |
| 1113 (mem (plus reg reg)) | |
| 1114 (mem (plus reg 0..255)). | |
| 1115 unless TARGET_BASE_ADDRESSES, in which case we accept all | |
| 1116 (mem constant_address) too. */ | |
| 1117 | |
| 1118 | |
| 1119 /* (mem reg) */ | |
| 1120 if (REG_P (x) && MMIX_REG_OK (x)) | |
| 1121 return 1; | |
| 1122 | |
| 1123 if (GET_CODE(x) == PLUS) | |
| 1124 { | |
| 1125 rtx x1 = XEXP (x, 0); | |
| 1126 rtx x2 = XEXP (x, 1); | |
| 1127 | |
| 1128 /* Try swapping the order. FIXME: Do we need this? */ | |
| 1129 if (! REG_P (x1)) | |
| 1130 { | |
| 1131 rtx tem = x1; | |
| 1132 x1 = x2; | |
| 1133 x2 = tem; | |
| 1134 } | |
| 1135 | |
| 1136 /* (mem (plus (reg?) (?))) */ | |
| 1137 if (!REG_P (x1) || !MMIX_REG_OK (x1)) | |
| 1138 return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); | |
| 1139 | |
| 1140 /* (mem (plus (reg) (reg?))) */ | |
| 1141 if (REG_P (x2) && MMIX_REG_OK (x2)) | |
| 1142 return 1; | |
| 1143 | |
| 1144 /* (mem (plus (reg) (0..255?))) */ | |
| 1145 if (GET_CODE (x2) == CONST_INT | |
| 1146 && CONST_OK_FOR_LETTER_P (INTVAL (x2), 'I')) | |
| 1147 return 1; | |
| 1148 | |
| 1149 return 0; | |
| 1150 } | |
| 1151 | |
| 1152 return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); | |
| 1153 } | |
| 1154 | |
| 1155 /* LEGITIMATE_CONSTANT_P. */ | |
| 1156 | |
| 1157 int | |
| 1158 mmix_legitimate_constant_p (rtx x) | |
| 1159 { | |
| 1160 RTX_CODE code = GET_CODE (x); | |
| 1161 | |
| 1162 /* We must allow any number due to the way the cse passes works; if we | |
| 1163 do not allow any number here, general_operand will fail, and insns | |
| 1164 will fatally fail recognition instead of "softly". */ | |
| 1165 if (code == CONST_INT || code == CONST_DOUBLE) | |
| 1166 return 1; | |
| 1167 | |
| 1168 return CONSTANT_ADDRESS_P (x); | |
| 1169 } | |
| 1170 | |
| 1171 /* SELECT_CC_MODE. */ | |
| 1172 | |
| 1173 enum machine_mode | |
| 1174 mmix_select_cc_mode (RTX_CODE op, rtx x, rtx y ATTRIBUTE_UNUSED) | |
| 1175 { | |
| 1176 /* We use CCmode, CC_UNSmode, CC_FPmode, CC_FPEQmode and CC_FUNmode to | |
| 1177 output different compare insns. Note that we do not check the | |
| 1178 validity of the comparison here. */ | |
| 1179 | |
| 1180 if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) | |
| 1181 { | |
| 1182 if (op == ORDERED || op == UNORDERED || op == UNGE | |
| 1183 || op == UNGT || op == UNLE || op == UNLT) | |
| 1184 return CC_FUNmode; | |
| 1185 | |
| 1186 if (op == EQ || op == NE) | |
| 1187 return CC_FPEQmode; | |
| 1188 | |
| 1189 return CC_FPmode; | |
| 1190 } | |
| 1191 | |
| 1192 if (op == GTU || op == LTU || op == GEU || op == LEU) | |
| 1193 return CC_UNSmode; | |
| 1194 | |
| 1195 return CCmode; | |
| 1196 } | |
| 1197 | |
| 1198 /* REVERSIBLE_CC_MODE. */ | |
| 1199 | |
| 1200 int | |
| 1201 mmix_reversible_cc_mode (enum machine_mode mode) | |
| 1202 { | |
| 1203 /* That is, all integer and the EQ, NE, ORDERED and UNORDERED float | |
| 1204 compares. */ | |
| 1205 return mode != CC_FPmode; | |
| 1206 } | |
| 1207 | |
| 1208 /* TARGET_RTX_COSTS. */ | |
| 1209 | |
| 1210 static bool | |
| 1211 mmix_rtx_costs (rtx x ATTRIBUTE_UNUSED, | |
| 1212 int code ATTRIBUTE_UNUSED, | |
| 1213 int outer_code ATTRIBUTE_UNUSED, | |
| 1214 int *total ATTRIBUTE_UNUSED, | |
| 1215 bool speed ATTRIBUTE_UNUSED) | |
| 1216 { | |
| 1217 /* For the time being, this is just a stub and we'll accept the | |
| 1218 generic calculations, until we can do measurements, at least. | |
| 1219 Say we did not modify any calculated costs. */ | |
| 1220 return false; | |
| 1221 } | |
| 1222 | |
| 1223 /* REGISTER_MOVE_COST. */ | |
| 1224 | |
| 1225 int | |
| 1226 mmix_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED, | |
| 1227 enum reg_class from, | |
| 1228 enum reg_class to) | |
| 1229 { | |
| 1230 return (from == GENERAL_REGS && from == to) ? 2 : 3; | |
| 1231 } | |
| 1232 | |
| 1233 /* Note that we don't have a TEXT_SECTION_ASM_OP, because it has to be a | |
| 1234 compile-time constant; it's used in an asm in crtstuff.c, compiled for | |
| 1235 the target. */ | |
| 1236 | |
| 1237 /* DATA_SECTION_ASM_OP. */ | |
| 1238 | |
| 1239 const char * | |
| 1240 mmix_data_section_asm_op (void) | |
| 1241 { | |
| 1242 return "\t.data ! mmixal:= 8H LOC 9B"; | |
| 1243 } | |
| 1244 | |
| 1245 static void | |
| 1246 mmix_encode_section_info (tree decl, rtx rtl, int first) | |
| 1247 { | |
| 1248 /* Test for an external declaration, and do nothing if it is one. */ | |
| 1249 if ((TREE_CODE (decl) == VAR_DECL | |
| 1250 && (DECL_EXTERNAL (decl) || TREE_PUBLIC (decl))) | |
| 1251 || (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))) | |
| 1252 ; | |
| 1253 else if (first && DECL_P (decl)) | |
| 1254 { | |
| 1255 /* For non-visible declarations, add a "@" prefix, which we skip | |
| 1256 when the label is output. If the label does not have this | |
| 1257 prefix, a ":" is output if -mtoplevel-symbols. | |
| 1258 | |
| 1259 Note that this does not work for data that is declared extern and | |
| 1260 later defined as static. If there's code in between, that code | |
| 1261 will refer to the extern declaration, and vice versa. This just | |
| 1262 means that when -mtoplevel-symbols is in use, we can just handle | |
| 1263 well-behaved ISO-compliant code. */ | |
| 1264 | |
| 1265 const char *str = XSTR (XEXP (rtl, 0), 0); | |
| 1266 int len = strlen (str); | |
| 1267 char *newstr = XALLOCAVEC (char, len + 2); | |
| 1268 newstr[0] = '@'; | |
| 1269 strcpy (newstr + 1, str); | |
| 1270 XSTR (XEXP (rtl, 0), 0) = ggc_alloc_string (newstr, len + 1); | |
| 1271 } | |
| 1272 | |
| 1273 /* Set SYMBOL_REF_FLAG for things that we want to access with GETA. We | |
| 1274 may need different options to reach for different things with GETA. | |
| 1275 For now, functions and things we know or have been told are constant. */ | |
| 1276 if (TREE_CODE (decl) == FUNCTION_DECL | |
| 1277 || TREE_CONSTANT (decl) | |
| 1278 || (TREE_CODE (decl) == VAR_DECL | |
| 1279 && TREE_READONLY (decl) | |
| 1280 && !TREE_SIDE_EFFECTS (decl) | |
| 1281 && (!DECL_INITIAL (decl) | |
| 1282 || TREE_CONSTANT (DECL_INITIAL (decl))))) | |
| 1283 SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; | |
| 1284 } | |
| 1285 | |
| 1286 static const char * | |
| 1287 mmix_strip_name_encoding (const char *name) | |
| 1288 { | |
| 1289 for (; (*name == '@' || *name == '*'); name++) | |
| 1290 ; | |
| 1291 | |
| 1292 return name; | |
| 1293 } | |
| 1294 | |
| 1295 /* TARGET_ASM_FILE_START. | |
| 1296 We just emit a little comment for the time being. */ | |
| 1297 | |
| 1298 static void | |
| 1299 mmix_file_start (void) | |
| 1300 { | |
| 1301 default_file_start (); | |
| 1302 | |
| 1303 fputs ("! mmixal:= 8H LOC Data_Section\n", asm_out_file); | |
| 1304 | |
| 1305 /* Make sure each file starts with the text section. */ | |
| 1306 switch_to_section (text_section); | |
| 1307 } | |
| 1308 | |
| 1309 /* TARGET_ASM_FILE_END. */ | |
| 1310 | |
| 1311 static void | |
| 1312 mmix_file_end (void) | |
| 1313 { | |
| 1314 /* Make sure each file ends with the data section. */ | |
| 1315 switch_to_section (data_section); | |
| 1316 } | |
| 1317 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1318 /* TARGET_ASM_OUTPUT_SOURCE_FILENAME. */ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1319 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1320 static void |
| 0 | 1321 mmix_asm_output_source_filename (FILE *stream, const char *name) |
| 1322 { | |
| 1323 fprintf (stream, "# 1 "); | |
| 1324 OUTPUT_QUOTED_STRING (stream, name); | |
| 1325 fprintf (stream, "\n"); | |
| 1326 } | |
| 1327 | |
| 1328 /* OUTPUT_QUOTED_STRING. */ | |
| 1329 | |
| 1330 void | |
| 1331 mmix_output_quoted_string (FILE *stream, const char *string, int length) | |
| 1332 { | |
| 1333 const char * string_end = string + length; | |
| 1334 static const char *const unwanted_chars = "\"[]\\"; | |
| 1335 | |
| 1336 /* Output "any character except newline and double quote character". We | |
| 1337 play it safe and avoid all control characters too. We also do not | |
| 1338 want [] as characters, should input be passed through m4 with [] as | |
| 1339 quotes. Further, we avoid "\", because the GAS port handles it as a | |
| 1340 quoting character. */ | |
| 1341 while (string < string_end) | |
| 1342 { | |
| 1343 if (*string | |
| 1344 && (unsigned char) *string < 128 | |
| 1345 && !ISCNTRL (*string) | |
| 1346 && strchr (unwanted_chars, *string) == NULL) | |
| 1347 { | |
| 1348 fputc ('"', stream); | |
| 1349 while (*string | |
| 1350 && (unsigned char) *string < 128 | |
| 1351 && !ISCNTRL (*string) | |
| 1352 && strchr (unwanted_chars, *string) == NULL | |
| 1353 && string < string_end) | |
| 1354 { | |
| 1355 fputc (*string, stream); | |
| 1356 string++; | |
| 1357 } | |
| 1358 fputc ('"', stream); | |
| 1359 if (string < string_end) | |
| 1360 fprintf (stream, ","); | |
| 1361 } | |
| 1362 if (string < string_end) | |
| 1363 { | |
| 1364 fprintf (stream, "#%x", *string & 255); | |
| 1365 string++; | |
| 1366 if (string < string_end) | |
| 1367 fprintf (stream, ","); | |
| 1368 } | |
| 1369 } | |
| 1370 } | |
| 1371 | |
| 1372 /* Target hook for assembling integer objects. Use mmix_print_operand | |
| 1373 for WYDE and TETRA. Use mmix_output_octa to output 8-byte | |
| 1374 CONST_DOUBLEs. */ | |
| 1375 | |
| 1376 static bool | |
| 1377 mmix_assemble_integer (rtx x, unsigned int size, int aligned_p) | |
| 1378 { | |
| 1379 if (aligned_p) | |
| 1380 switch (size) | |
| 1381 { | |
| 1382 /* We handle a limited number of types of operands in here. But | |
| 1383 that's ok, because we can punt to generic functions. We then | |
| 1384 pretend that aligned data isn't needed, so the usual .<pseudo> | |
| 1385 syntax is used (which works for aligned data too). We actually | |
| 1386 *must* do that, since we say we don't have simple aligned | |
| 1387 pseudos, causing this function to be called. We just try and | |
| 1388 keep as much compatibility as possible with mmixal syntax for | |
| 1389 normal cases (i.e. without GNU extensions and C only). */ | |
| 1390 case 1: | |
| 1391 if (GET_CODE (x) != CONST_INT) | |
| 1392 { | |
| 1393 aligned_p = 0; | |
| 1394 break; | |
| 1395 } | |
| 1396 fputs ("\tBYTE\t", asm_out_file); | |
| 1397 mmix_print_operand (asm_out_file, x, 'B'); | |
| 1398 fputc ('\n', asm_out_file); | |
| 1399 return true; | |
| 1400 | |
| 1401 case 2: | |
| 1402 if (GET_CODE (x) != CONST_INT) | |
| 1403 { | |
| 1404 aligned_p = 0; | |
| 1405 break; | |
| 1406 } | |
| 1407 fputs ("\tWYDE\t", asm_out_file); | |
| 1408 mmix_print_operand (asm_out_file, x, 'W'); | |
| 1409 fputc ('\n', asm_out_file); | |
| 1410 return true; | |
| 1411 | |
| 1412 case 4: | |
| 1413 if (GET_CODE (x) != CONST_INT) | |
| 1414 { | |
| 1415 aligned_p = 0; | |
| 1416 break; | |
| 1417 } | |
| 1418 fputs ("\tTETRA\t", asm_out_file); | |
| 1419 mmix_print_operand (asm_out_file, x, 'L'); | |
| 1420 fputc ('\n', asm_out_file); | |
| 1421 return true; | |
| 1422 | |
| 1423 case 8: | |
| 1424 /* We don't get here anymore for CONST_DOUBLE, because DImode | |
| 1425 isn't expressed as CONST_DOUBLE, and DFmode is handled | |
| 1426 elsewhere. */ | |
| 1427 gcc_assert (GET_CODE (x) != CONST_DOUBLE); | |
| 1428 assemble_integer_with_op ("\tOCTA\t", x); | |
| 1429 return true; | |
| 1430 } | |
| 1431 return default_assemble_integer (x, size, aligned_p); | |
| 1432 } | |
| 1433 | |
| 1434 /* ASM_OUTPUT_ASCII. */ | |
| 1435 | |
| 1436 void | |
| 1437 mmix_asm_output_ascii (FILE *stream, const char *string, int length) | |
| 1438 { | |
| 1439 while (length > 0) | |
| 1440 { | |
| 1441 int chunk_size = length > 60 ? 60 : length; | |
| 1442 fprintf (stream, "\tBYTE "); | |
| 1443 mmix_output_quoted_string (stream, string, chunk_size); | |
| 1444 string += chunk_size; | |
| 1445 length -= chunk_size; | |
| 1446 fprintf (stream, "\n"); | |
| 1447 } | |
| 1448 } | |
| 1449 | |
| 1450 /* ASM_OUTPUT_ALIGNED_COMMON. */ | |
| 1451 | |
| 1452 void | |
| 1453 mmix_asm_output_aligned_common (FILE *stream, | |
| 1454 const char *name, | |
| 1455 int size, | |
| 1456 int align) | |
| 1457 { | |
| 1458 /* This is mostly the elfos.h one. There doesn't seem to be a way to | |
| 1459 express this in a mmixal-compatible way. */ | |
| 1460 fprintf (stream, "\t.comm\t"); | |
| 1461 assemble_name (stream, name); | |
| 1462 fprintf (stream, ",%u,%u ! mmixal-incompatible COMMON\n", | |
| 1463 size, align / BITS_PER_UNIT); | |
| 1464 } | |
| 1465 | |
| 1466 /* ASM_OUTPUT_ALIGNED_LOCAL. */ | |
| 1467 | |
| 1468 void | |
| 1469 mmix_asm_output_aligned_local (FILE *stream, | |
| 1470 const char *name, | |
| 1471 int size, | |
| 1472 int align) | |
| 1473 { | |
| 1474 switch_to_section (data_section); | |
| 1475 | |
| 1476 ASM_OUTPUT_ALIGN (stream, exact_log2 (align/BITS_PER_UNIT)); | |
| 1477 assemble_name (stream, name); | |
| 1478 fprintf (stream, "\tLOC @+%d\n", size); | |
| 1479 } | |
| 1480 | |
| 1481 /* ASM_OUTPUT_LABEL. */ | |
| 1482 | |
| 1483 void | |
| 1484 mmix_asm_output_label (FILE *stream, const char *name) | |
| 1485 { | |
| 1486 assemble_name (stream, name); | |
| 1487 fprintf (stream, "\tIS @\n"); | |
| 1488 } | |
| 1489 | |
| 1490 /* ASM_OUTPUT_INTERNAL_LABEL. */ | |
| 1491 | |
| 1492 void | |
| 1493 mmix_asm_output_internal_label (FILE *stream, const char *name) | |
| 1494 { | |
| 1495 assemble_name_raw (stream, name); | |
| 1496 fprintf (stream, "\tIS @\n"); | |
| 1497 } | |
| 1498 | |
| 1499 /* ASM_DECLARE_REGISTER_GLOBAL. */ | |
| 1500 | |
| 1501 void | |
| 1502 mmix_asm_declare_register_global (FILE *stream ATTRIBUTE_UNUSED, | |
| 1503 tree decl ATTRIBUTE_UNUSED, | |
| 1504 int regno ATTRIBUTE_UNUSED, | |
| 1505 const char *name ATTRIBUTE_UNUSED) | |
| 1506 { | |
| 1507 /* Nothing to do here, but there *will* be, therefore the framework is | |
| 1508 here. */ | |
| 1509 } | |
| 1510 | |
| 1511 /* ASM_WEAKEN_LABEL. */ | |
| 1512 | |
| 1513 void | |
| 1514 mmix_asm_weaken_label (FILE *stream ATTRIBUTE_UNUSED, | |
| 1515 const char *name ATTRIBUTE_UNUSED) | |
| 1516 { | |
| 1517 fprintf (stream, "\t.weak "); | |
| 1518 assemble_name (stream, name); | |
| 1519 fprintf (stream, " ! mmixal-incompatible\n"); | |
| 1520 } | |
| 1521 | |
| 1522 /* MAKE_DECL_ONE_ONLY. */ | |
| 1523 | |
| 1524 void | |
| 1525 mmix_make_decl_one_only (tree decl) | |
| 1526 { | |
| 1527 DECL_WEAK (decl) = 1; | |
| 1528 } | |
| 1529 | |
| 1530 /* ASM_OUTPUT_LABELREF. | |
| 1531 Strip GCC's '*' and our own '@'. No order is assumed. */ | |
| 1532 | |
| 1533 void | |
| 1534 mmix_asm_output_labelref (FILE *stream, const char *name) | |
| 1535 { | |
| 1536 int is_extern = 1; | |
| 1537 | |
| 1538 for (; (*name == '@' || *name == '*'); name++) | |
| 1539 if (*name == '@') | |
| 1540 is_extern = 0; | |
| 1541 | |
| 1542 asm_fprintf (stream, "%s%U%s", | |
| 1543 is_extern && TARGET_TOPLEVEL_SYMBOLS ? ":" : "", | |
| 1544 name); | |
| 1545 } | |
| 1546 | |
| 1547 /* ASM_OUTPUT_DEF. */ | |
| 1548 | |
| 1549 void | |
| 1550 mmix_asm_output_def (FILE *stream, const char *name, const char *value) | |
| 1551 { | |
| 1552 assemble_name (stream, name); | |
| 1553 fprintf (stream, "\tIS "); | |
| 1554 assemble_name (stream, value); | |
| 1555 fputc ('\n', stream); | |
| 1556 } | |
| 1557 | |
| 1558 /* PRINT_OPERAND. */ | |
| 1559 | |
| 1560 void | |
| 1561 mmix_print_operand (FILE *stream, rtx x, int code) | |
| 1562 { | |
| 1563 /* When we add support for different codes later, we can, when needed, | |
| 1564 drop through to the main handler with a modified operand. */ | |
| 1565 rtx modified_x = x; | |
| 1566 int regno = x != NULL_RTX && REG_P (x) ? REGNO (x) : 0; | |
| 1567 | |
| 1568 switch (code) | |
| 1569 { | |
| 1570 /* Unrelated codes are in alphabetic order. */ | |
| 1571 | |
| 1572 case '+': | |
| 1573 /* For conditional branches, output "P" for a probable branch. */ | |
| 1574 if (TARGET_BRANCH_PREDICT) | |
| 1575 { | |
| 1576 x = find_reg_note (current_output_insn, REG_BR_PROB, 0); | |
| 1577 if (x && INTVAL (XEXP (x, 0)) > REG_BR_PROB_BASE / 2) | |
| 1578 putc ('P', stream); | |
| 1579 } | |
| 1580 return; | |
| 1581 | |
| 1582 case '.': | |
| 1583 /* For the %d in POP %d,0. */ | |
| 1584 fprintf (stream, "%d", MMIX_POP_ARGUMENT ()); | |
| 1585 return; | |
| 1586 | |
| 1587 case 'B': | |
| 1588 if (GET_CODE (x) != CONST_INT) | |
| 1589 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
| 1590 fprintf (stream, "%d", (int) (INTVAL (x) & 0xff)); | |
| 1591 return; | |
| 1592 | |
| 1593 case 'H': | |
| 1594 /* Highpart. Must be general register, and not the last one, as | |
| 1595 that one cannot be part of a consecutive register pair. */ | |
| 1596 if (regno > MMIX_LAST_GENERAL_REGISTER - 1) | |
| 1597 internal_error ("MMIX Internal: Bad register: %d", regno); | |
| 1598 | |
| 1599 /* This is big-endian, so the high-part is the first one. */ | |
| 1600 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
| 1601 return; | |
| 1602 | |
| 1603 case 'L': | |
| 1604 /* Lowpart. Must be CONST_INT or general register, and not the last | |
| 1605 one, as that one cannot be part of a consecutive register pair. */ | |
| 1606 if (GET_CODE (x) == CONST_INT) | |
| 1607 { | |
| 1608 fprintf (stream, "#%lx", | |
| 1609 (unsigned long) (INTVAL (x) | |
| 1610 & ((unsigned int) 0x7fffffff * 2 + 1))); | |
| 1611 return; | |
| 1612 } | |
| 1613 | |
| 1614 if (GET_CODE (x) == SYMBOL_REF) | |
| 1615 { | |
| 1616 output_addr_const (stream, x); | |
| 1617 return; | |
| 1618 } | |
| 1619 | |
| 1620 if (regno > MMIX_LAST_GENERAL_REGISTER - 1) | |
| 1621 internal_error ("MMIX Internal: Bad register: %d", regno); | |
| 1622 | |
| 1623 /* This is big-endian, so the low-part is + 1. */ | |
| 1624 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno) + 1]); | |
| 1625 return; | |
| 1626 | |
| 1627 /* Can't use 'a' because that's a generic modifier for address | |
| 1628 output. */ | |
| 1629 case 'A': | |
| 1630 mmix_output_shiftvalue_op_from_str (stream, "ANDN", | |
| 1631 ~(unsigned HOST_WIDEST_INT) | |
| 1632 mmix_intval (x)); | |
| 1633 return; | |
| 1634 | |
| 1635 case 'i': | |
| 1636 mmix_output_shiftvalue_op_from_str (stream, "INC", | |
| 1637 (unsigned HOST_WIDEST_INT) | |
| 1638 mmix_intval (x)); | |
| 1639 return; | |
| 1640 | |
| 1641 case 'o': | |
| 1642 mmix_output_shiftvalue_op_from_str (stream, "OR", | |
| 1643 (unsigned HOST_WIDEST_INT) | |
| 1644 mmix_intval (x)); | |
| 1645 return; | |
| 1646 | |
| 1647 case 's': | |
| 1648 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 1649 (unsigned HOST_WIDEST_INT) | |
| 1650 mmix_intval (x)); | |
| 1651 return; | |
| 1652 | |
| 1653 case 'd': | |
| 1654 case 'D': | |
| 1655 mmix_output_condition (stream, x, (code == 'D')); | |
| 1656 return; | |
| 1657 | |
| 1658 case 'e': | |
| 1659 /* Output an extra "e" to make fcmpe, fune. */ | |
| 1660 if (TARGET_FCMP_EPSILON) | |
| 1661 fprintf (stream, "e"); | |
| 1662 return; | |
| 1663 | |
| 1664 case 'm': | |
| 1665 /* Output the number minus 1. */ | |
| 1666 if (GET_CODE (x) != CONST_INT) | |
| 1667 { | |
| 1668 fatal_insn ("MMIX Internal: Bad value for 'm', not a CONST_INT", | |
| 1669 x); | |
| 1670 } | |
| 1671 fprintf (stream, HOST_WIDEST_INT_PRINT_DEC, | |
| 1672 (HOST_WIDEST_INT) (mmix_intval (x) - 1)); | |
| 1673 return; | |
| 1674 | |
| 1675 case 'p': | |
| 1676 /* Store the number of registers we want to save. This was setup | |
| 1677 by the prologue. The actual operand contains the number of | |
| 1678 registers to pass, but we don't use it currently. Anyway, we | |
| 1679 need to output the number of saved registers here. */ | |
| 1680 fprintf (stream, "%d", | |
| 1681 cfun->machine->highest_saved_stack_register + 1); | |
| 1682 return; | |
| 1683 | |
| 1684 case 'r': | |
| 1685 /* Store the register to output a constant to. */ | |
| 1686 if (! REG_P (x)) | |
| 1687 fatal_insn ("MMIX Internal: Expected a register, not this", x); | |
| 1688 mmix_output_destination_register = MMIX_OUTPUT_REGNO (regno); | |
| 1689 return; | |
| 1690 | |
| 1691 case 'I': | |
| 1692 /* Output the constant. Note that we use this for floats as well. */ | |
| 1693 if (GET_CODE (x) != CONST_INT | |
| 1694 && (GET_CODE (x) != CONST_DOUBLE | |
| 1695 || (GET_MODE (x) != VOIDmode && GET_MODE (x) != DFmode | |
| 1696 && GET_MODE (x) != SFmode))) | |
| 1697 fatal_insn ("MMIX Internal: Expected a constant, not this", x); | |
| 1698 mmix_output_register_setting (stream, | |
| 1699 mmix_output_destination_register, | |
| 1700 mmix_intval (x), 0); | |
| 1701 return; | |
| 1702 | |
| 1703 case 'U': | |
| 1704 /* An U for unsigned, if TARGET_ZERO_EXTEND. Ignore the operand. */ | |
| 1705 if (TARGET_ZERO_EXTEND) | |
| 1706 putc ('U', stream); | |
| 1707 return; | |
| 1708 | |
| 1709 case 'v': | |
| 1710 mmix_output_shifted_value (stream, (HOST_WIDEST_INT) mmix_intval (x)); | |
| 1711 return; | |
| 1712 | |
| 1713 case 'V': | |
| 1714 mmix_output_shifted_value (stream, (HOST_WIDEST_INT) ~mmix_intval (x)); | |
| 1715 return; | |
| 1716 | |
| 1717 case 'W': | |
| 1718 if (GET_CODE (x) != CONST_INT) | |
| 1719 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
| 1720 fprintf (stream, "#%x", (int) (INTVAL (x) & 0xffff)); | |
| 1721 return; | |
| 1722 | |
| 1723 case 0: | |
| 1724 /* Nothing to do. */ | |
| 1725 break; | |
| 1726 | |
| 1727 default: | |
| 1728 /* Presumably there's a missing case above if we get here. */ | |
| 1729 internal_error ("MMIX Internal: Missing %qc case in mmix_print_operand", code); | |
| 1730 } | |
| 1731 | |
| 1732 switch (GET_CODE (modified_x)) | |
| 1733 { | |
| 1734 case REG: | |
| 1735 regno = REGNO (modified_x); | |
| 1736 if (regno >= FIRST_PSEUDO_REGISTER) | |
| 1737 internal_error ("MMIX Internal: Bad register: %d", regno); | |
| 1738 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
| 1739 return; | |
| 1740 | |
| 1741 case MEM: | |
| 1742 output_address (XEXP (modified_x, 0)); | |
| 1743 return; | |
| 1744 | |
| 1745 case CONST_INT: | |
| 1746 /* For -2147483648, mmixal complains that the constant does not fit | |
| 1747 in 4 bytes, so let's output it as hex. Take care to handle hosts | |
| 1748 where HOST_WIDE_INT is longer than an int. | |
| 1749 | |
| 1750 Print small constants +-255 using decimal. */ | |
| 1751 | |
| 1752 if (INTVAL (modified_x) > -256 && INTVAL (modified_x) < 256) | |
| 1753 fprintf (stream, "%d", (int) (INTVAL (modified_x))); | |
| 1754 else | |
| 1755 fprintf (stream, "#%x", | |
| 1756 (int) (INTVAL (modified_x)) & (unsigned int) ~0); | |
| 1757 return; | |
| 1758 | |
| 1759 case CONST_DOUBLE: | |
| 1760 /* Do somewhat as CONST_INT. */ | |
| 1761 mmix_output_octa (stream, mmix_intval (modified_x), 0); | |
| 1762 return; | |
| 1763 | |
| 1764 case CONST: | |
| 1765 output_addr_const (stream, modified_x); | |
| 1766 return; | |
| 1767 | |
| 1768 default: | |
| 1769 /* No need to test for all strange things. Let output_addr_const do | |
| 1770 it for us. */ | |
| 1771 if (CONSTANT_P (modified_x) | |
| 1772 /* Strangely enough, this is not included in CONSTANT_P. | |
| 1773 FIXME: Ask/check about sanity here. */ | |
| 1774 || GET_CODE (modified_x) == CODE_LABEL) | |
| 1775 { | |
| 1776 output_addr_const (stream, modified_x); | |
| 1777 return; | |
| 1778 } | |
| 1779 | |
| 1780 /* We need the original here. */ | |
| 1781 fatal_insn ("MMIX Internal: Cannot decode this operand", x); | |
| 1782 } | |
| 1783 } | |
| 1784 | |
| 1785 /* PRINT_OPERAND_PUNCT_VALID_P. */ | |
| 1786 | |
| 1787 int | |
| 1788 mmix_print_operand_punct_valid_p (int code ATTRIBUTE_UNUSED) | |
| 1789 { | |
| 1790 /* A '+' is used for branch prediction, similar to other ports. */ | |
| 1791 return code == '+' | |
| 1792 /* A '.' is used for the %d in the POP %d,0 return insn. */ | |
| 1793 || code == '.'; | |
| 1794 } | |
| 1795 | |
| 1796 /* PRINT_OPERAND_ADDRESS. */ | |
| 1797 | |
| 1798 void | |
| 1799 mmix_print_operand_address (FILE *stream, rtx x) | |
| 1800 { | |
| 1801 if (REG_P (x)) | |
| 1802 { | |
| 1803 /* I find the generated assembly code harder to read without | |
| 1804 the ",0". */ | |
| 1805 fprintf (stream, "%s,0", reg_names[MMIX_OUTPUT_REGNO (REGNO (x))]); | |
| 1806 return; | |
| 1807 } | |
| 1808 else if (GET_CODE (x) == PLUS) | |
| 1809 { | |
| 1810 rtx x1 = XEXP (x, 0); | |
| 1811 rtx x2 = XEXP (x, 1); | |
| 1812 | |
| 1813 if (REG_P (x1)) | |
| 1814 { | |
| 1815 fprintf (stream, "%s,", reg_names[MMIX_OUTPUT_REGNO (REGNO (x1))]); | |
| 1816 | |
| 1817 if (REG_P (x2)) | |
| 1818 { | |
| 1819 fprintf (stream, "%s", | |
| 1820 reg_names[MMIX_OUTPUT_REGNO (REGNO (x2))]); | |
| 1821 return; | |
| 1822 } | |
| 1823 else if (GET_CODE (x2) == CONST_INT | |
| 1824 && CONST_OK_FOR_LETTER_P (INTVAL (x2), 'I')) | |
| 1825 { | |
| 1826 output_addr_const (stream, x2); | |
| 1827 return; | |
| 1828 } | |
| 1829 } | |
| 1830 } | |
| 1831 | |
| 1832 if (TARGET_BASE_ADDRESSES && mmix_legitimate_constant_p (x)) | |
| 1833 { | |
| 1834 output_addr_const (stream, x); | |
| 1835 return; | |
| 1836 } | |
| 1837 | |
| 1838 fatal_insn ("MMIX Internal: This is not a recognized address", x); | |
| 1839 } | |
| 1840 | |
| 1841 /* ASM_OUTPUT_REG_PUSH. */ | |
| 1842 | |
| 1843 void | |
| 1844 mmix_asm_output_reg_push (FILE *stream, int regno) | |
| 1845 { | |
| 1846 fprintf (stream, "\tSUBU %s,%s,8\n\tSTOU %s,%s,0\n", | |
| 1847 reg_names[MMIX_STACK_POINTER_REGNUM], | |
| 1848 reg_names[MMIX_STACK_POINTER_REGNUM], | |
| 1849 reg_names[MMIX_OUTPUT_REGNO (regno)], | |
| 1850 reg_names[MMIX_STACK_POINTER_REGNUM]); | |
| 1851 } | |
| 1852 | |
| 1853 /* ASM_OUTPUT_REG_POP. */ | |
| 1854 | |
| 1855 void | |
| 1856 mmix_asm_output_reg_pop (FILE *stream, int regno) | |
| 1857 { | |
| 1858 fprintf (stream, "\tLDOU %s,%s,0\n\tINCL %s,8\n", | |
| 1859 reg_names[MMIX_OUTPUT_REGNO (regno)], | |
| 1860 reg_names[MMIX_STACK_POINTER_REGNUM], | |
| 1861 reg_names[MMIX_STACK_POINTER_REGNUM]); | |
| 1862 } | |
| 1863 | |
| 1864 /* ASM_OUTPUT_ADDR_DIFF_ELT. */ | |
| 1865 | |
| 1866 void | |
| 1867 mmix_asm_output_addr_diff_elt (FILE *stream, | |
| 1868 rtx body ATTRIBUTE_UNUSED, | |
| 1869 int value, | |
| 1870 int rel) | |
| 1871 { | |
| 1872 fprintf (stream, "\tTETRA L%d-L%d\n", value, rel); | |
| 1873 } | |
| 1874 | |
| 1875 /* ASM_OUTPUT_ADDR_VEC_ELT. */ | |
| 1876 | |
| 1877 void | |
| 1878 mmix_asm_output_addr_vec_elt (FILE *stream, int value) | |
| 1879 { | |
| 1880 fprintf (stream, "\tOCTA L:%d\n", value); | |
| 1881 } | |
| 1882 | |
| 1883 /* ASM_OUTPUT_SKIP. */ | |
| 1884 | |
| 1885 void | |
| 1886 mmix_asm_output_skip (FILE *stream, int nbytes) | |
| 1887 { | |
| 1888 fprintf (stream, "\tLOC @+%d\n", nbytes); | |
| 1889 } | |
| 1890 | |
| 1891 /* ASM_OUTPUT_ALIGN. */ | |
| 1892 | |
| 1893 void | |
| 1894 mmix_asm_output_align (FILE *stream, int power) | |
| 1895 { | |
| 1896 /* We need to record the needed alignment of this section in the object, | |
| 1897 so we have to output an alignment directive. Use a .p2align (not | |
| 1898 .align) so people will never have to wonder about whether the | |
| 1899 argument is in number of bytes or the log2 thereof. We do it in | |
| 1900 addition to the LOC directive, so nothing needs tweaking when | |
| 1901 copy-pasting assembly into mmixal. */ | |
| 1902 fprintf (stream, "\t.p2align %d\n", power); | |
| 1903 fprintf (stream, "\tLOC @+(%d-@)&%d\n", 1 << power, (1 << power) - 1); | |
| 1904 } | |
| 1905 | |
| 1906 /* DBX_REGISTER_NUMBER. */ | |
| 1907 | |
|
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1908 unsigned |
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1909 mmix_dbx_register_number (unsigned regno) |
| 0 | 1910 { |
| 1911 /* Adjust the register number to the one it will be output as, dammit. | |
| 1912 It'd be nice if we could check the assumption that we're filling a | |
| 1913 gap, but every register between the last saved register and parameter | |
| 1914 registers might be a valid parameter register. */ | |
| 1915 regno = MMIX_OUTPUT_REGNO (regno); | |
| 1916 | |
| 1917 /* We need to renumber registers to get the number of the return address | |
| 1918 register in the range 0..255. It is also space-saving if registers | |
| 1919 mentioned in the call-frame information (which uses this function by | |
| 1920 defaulting DWARF_FRAME_REGNUM to DBX_REGISTER_NUMBER) are numbered | |
| 1921 0 .. 63. So map 224 .. 256+15 -> 0 .. 47 and 0 .. 223 -> 48..223+48. */ | |
| 1922 return regno >= 224 ? (regno - 224) : (regno + 48); | |
| 1923 } | |
| 1924 | |
| 1925 /* End of target macro support functions. | |
| 1926 | |
| 1927 Now the MMIX port's own functions. First the exported ones. */ | |
| 1928 | |
| 1929 /* Wrapper for get_hard_reg_initial_val since integrate.h isn't included | |
| 1930 from insn-emit.c. */ | |
| 1931 | |
| 1932 rtx | |
| 1933 mmix_get_hard_reg_initial_val (enum machine_mode mode, int regno) | |
| 1934 { | |
| 1935 return get_hard_reg_initial_val (mode, regno); | |
| 1936 } | |
| 1937 | |
| 1938 /* Nonzero when the function epilogue is simple enough that a single | |
| 1939 "POP %d,0" should be used even within the function. */ | |
| 1940 | |
| 1941 int | |
| 1942 mmix_use_simple_return (void) | |
| 1943 { | |
| 1944 int regno; | |
| 1945 | |
| 1946 int stack_space_to_allocate | |
| 1947 = (crtl->outgoing_args_size | |
| 1948 + crtl->args.pretend_args_size | |
| 1949 + get_frame_size () + 7) & ~7; | |
| 1950 | |
| 1951 if (!TARGET_USE_RETURN_INSN || !reload_completed) | |
| 1952 return 0; | |
| 1953 | |
| 1954 for (regno = 255; | |
| 1955 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 1956 regno--) | |
| 1957 /* Note that we assume that the frame-pointer-register is one of these | |
| 1958 registers, in which case we don't count it here. */ | |
| 1959 if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 1960 && df_regs_ever_live_p (regno) && !call_used_regs[regno])) | |
| 1961 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 1962 return 0; | |
| 1963 | |
| 1964 if (frame_pointer_needed) | |
| 1965 stack_space_to_allocate += 8; | |
| 1966 | |
| 1967 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 1968 stack_space_to_allocate += 16; | |
| 1969 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 1970 stack_space_to_allocate += 8; | |
| 1971 | |
| 1972 return stack_space_to_allocate == 0; | |
| 1973 } | |
| 1974 | |
| 1975 | |
| 1976 /* Expands the function prologue into RTX. */ | |
| 1977 | |
| 1978 void | |
| 1979 mmix_expand_prologue (void) | |
| 1980 { | |
| 1981 HOST_WIDE_INT locals_size = get_frame_size (); | |
| 1982 int regno; | |
| 1983 HOST_WIDE_INT stack_space_to_allocate | |
| 1984 = (crtl->outgoing_args_size | |
| 1985 + crtl->args.pretend_args_size | |
| 1986 + locals_size + 7) & ~7; | |
| 1987 HOST_WIDE_INT offset = -8; | |
| 1988 | |
| 1989 /* Add room needed to save global non-register-stack registers. */ | |
| 1990 for (regno = 255; | |
| 1991 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 1992 regno--) | |
| 1993 /* Note that we assume that the frame-pointer-register is one of these | |
| 1994 registers, in which case we don't count it here. */ | |
| 1995 if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 1996 && df_regs_ever_live_p (regno) && !call_used_regs[regno])) | |
| 1997 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 1998 stack_space_to_allocate += 8; | |
| 1999 | |
| 2000 /* If we do have a frame-pointer, add room for it. */ | |
| 2001 if (frame_pointer_needed) | |
| 2002 stack_space_to_allocate += 8; | |
| 2003 | |
| 2004 /* If we have a non-local label, we need to be able to unwind to it, so | |
| 2005 store the current register stack pointer. Also store the return | |
| 2006 address if we do that. */ | |
| 2007 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2008 stack_space_to_allocate += 16; | |
| 2009 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2010 /* If we do have a saved return-address slot, add room for it. */ | |
| 2011 stack_space_to_allocate += 8; | |
| 2012 | |
| 2013 /* Make sure we don't get an unaligned stack. */ | |
| 2014 if ((stack_space_to_allocate % 8) != 0) | |
| 2015 internal_error ("stack frame not a multiple of 8 bytes: %wd", | |
| 2016 stack_space_to_allocate); | |
| 2017 | |
| 2018 if (crtl->args.pretend_args_size) | |
| 2019 { | |
| 2020 int mmix_first_vararg_reg | |
| 2021 = (MMIX_FIRST_INCOMING_ARG_REGNUM | |
| 2022 + (MMIX_MAX_ARGS_IN_REGS | |
| 2023 - crtl->args.pretend_args_size / 8)); | |
| 2024 | |
| 2025 for (regno | |
| 2026 = MMIX_FIRST_INCOMING_ARG_REGNUM + MMIX_MAX_ARGS_IN_REGS - 1; | |
| 2027 regno >= mmix_first_vararg_reg; | |
| 2028 regno--) | |
| 2029 { | |
| 2030 if (offset < 0) | |
| 2031 { | |
| 2032 HOST_WIDE_INT stack_chunk | |
| 2033 = stack_space_to_allocate > (256 - 8) | |
| 2034 ? (256 - 8) : stack_space_to_allocate; | |
| 2035 | |
| 2036 mmix_emit_sp_add (-stack_chunk); | |
| 2037 offset += stack_chunk; | |
| 2038 stack_space_to_allocate -= stack_chunk; | |
| 2039 } | |
| 2040 | |
| 2041 /* These registers aren't actually saved (as in "will be | |
| 2042 restored"), so don't tell DWARF2 they're saved. */ | |
| 2043 emit_move_insn (gen_rtx_MEM (DImode, | |
| 2044 plus_constant (stack_pointer_rtx, | |
| 2045 offset)), | |
| 2046 gen_rtx_REG (DImode, regno)); | |
| 2047 offset -= 8; | |
| 2048 } | |
| 2049 } | |
| 2050 | |
| 2051 /* Store the frame-pointer. */ | |
| 2052 | |
| 2053 if (frame_pointer_needed) | |
| 2054 { | |
| 2055 rtx insn; | |
| 2056 | |
| 2057 if (offset < 0) | |
| 2058 { | |
| 2059 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
| 2060 HOST_WIDE_INT stack_chunk | |
| 2061 = stack_space_to_allocate > (256 - 8 - 8) | |
| 2062 ? (256 - 8 - 8) : stack_space_to_allocate; | |
| 2063 | |
| 2064 mmix_emit_sp_add (-stack_chunk); | |
| 2065 | |
| 2066 offset += stack_chunk; | |
| 2067 stack_space_to_allocate -= stack_chunk; | |
| 2068 } | |
| 2069 | |
| 2070 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
| 2071 plus_constant (stack_pointer_rtx, | |
| 2072 offset)), | |
| 2073 hard_frame_pointer_rtx); | |
| 2074 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2075 insn = emit_insn (gen_adddi3 (hard_frame_pointer_rtx, | |
| 2076 stack_pointer_rtx, | |
| 2077 GEN_INT (offset + 8))); | |
| 2078 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2079 offset -= 8; | |
| 2080 } | |
| 2081 | |
| 2082 if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2083 { | |
| 2084 rtx tmpreg, retreg; | |
| 2085 rtx insn; | |
| 2086 | |
| 2087 /* Store the return-address, if one is needed on the stack. We | |
| 2088 usually store it in a register when needed, but that doesn't work | |
| 2089 with -fexceptions. */ | |
| 2090 | |
| 2091 if (offset < 0) | |
| 2092 { | |
| 2093 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
| 2094 HOST_WIDE_INT stack_chunk | |
| 2095 = stack_space_to_allocate > (256 - 8 - 8) | |
| 2096 ? (256 - 8 - 8) : stack_space_to_allocate; | |
| 2097 | |
| 2098 mmix_emit_sp_add (-stack_chunk); | |
| 2099 | |
| 2100 offset += stack_chunk; | |
| 2101 stack_space_to_allocate -= stack_chunk; | |
| 2102 } | |
| 2103 | |
| 2104 tmpreg = gen_rtx_REG (DImode, 255); | |
| 2105 retreg = gen_rtx_REG (DImode, MMIX_rJ_REGNUM); | |
| 2106 | |
| 2107 /* Dwarf2 code is confused by the use of a temporary register for | |
| 2108 storing the return address, so we have to express it as a note, | |
| 2109 which we attach to the actual store insn. */ | |
| 2110 emit_move_insn (tmpreg, retreg); | |
| 2111 | |
| 2112 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
| 2113 plus_constant (stack_pointer_rtx, | |
| 2114 offset)), | |
| 2115 tmpreg); | |
| 2116 RTX_FRAME_RELATED_P (insn) = 1; | |
|
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2117 add_reg_note (insn, REG_FRAME_RELATED_EXPR, |
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2118 gen_rtx_SET (VOIDmode, |
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2119 gen_rtx_MEM (DImode, |
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2120 plus_constant (stack_pointer_rtx, |
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2121 offset)), |
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|
2122 retreg)); |
| 0 | 2123 |
| 2124 offset -= 8; | |
| 2125 } | |
| 2126 else if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2127 offset -= 8; | |
| 2128 | |
| 2129 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2130 { | |
| 2131 /* Store the register defining the numbering of local registers, so | |
| 2132 we know how long to unwind the register stack. */ | |
| 2133 | |
| 2134 if (offset < 0) | |
| 2135 { | |
| 2136 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
| 2137 HOST_WIDE_INT stack_chunk | |
| 2138 = stack_space_to_allocate > (256 - 8 - 8) | |
| 2139 ? (256 - 8 - 8) : stack_space_to_allocate; | |
| 2140 | |
| 2141 mmix_emit_sp_add (-stack_chunk); | |
| 2142 | |
| 2143 offset += stack_chunk; | |
| 2144 stack_space_to_allocate -= stack_chunk; | |
| 2145 } | |
| 2146 | |
| 2147 /* We don't tell dwarf2 about this one; we just have it to unwind | |
| 2148 the register stack at landing pads. FIXME: It's a kludge because | |
| 2149 we can't describe the effect of the PUSHJ and PUSHGO insns on the | |
| 2150 register stack at the moment. Best thing would be to handle it | |
| 2151 like stack-pointer offsets. Better: some hook into dwarf2out.c | |
| 2152 to produce DW_CFA_expression:s that specify the increment of rO, | |
| 2153 and unwind it at eh_return (preferred) or at the landing pad. | |
| 2154 Then saves to $0..$G-1 could be specified through that register. */ | |
| 2155 | |
| 2156 emit_move_insn (gen_rtx_REG (DImode, 255), | |
| 2157 gen_rtx_REG (DImode, | |
| 2158 MMIX_rO_REGNUM)); | |
| 2159 emit_move_insn (gen_rtx_MEM (DImode, | |
| 2160 plus_constant (stack_pointer_rtx, offset)), | |
| 2161 gen_rtx_REG (DImode, 255)); | |
| 2162 offset -= 8; | |
| 2163 } | |
| 2164 | |
| 2165 /* After the return-address and the frame-pointer, we have the local | |
| 2166 variables. They're the ones that may have an "unaligned" size. */ | |
| 2167 offset -= (locals_size + 7) & ~7; | |
| 2168 | |
| 2169 /* Now store all registers that are global, i.e. not saved by the | |
| 2170 register file machinery. | |
| 2171 | |
| 2172 It is assumed that the frame-pointer is one of these registers, so it | |
| 2173 is explicitly excluded in the count. */ | |
| 2174 | |
| 2175 for (regno = 255; | |
| 2176 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 2177 regno--) | |
| 2178 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 2179 && df_regs_ever_live_p (regno) && ! call_used_regs[regno]) | |
| 2180 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 2181 { | |
| 2182 rtx insn; | |
| 2183 | |
| 2184 if (offset < 0) | |
| 2185 { | |
| 2186 HOST_WIDE_INT stack_chunk | |
| 2187 = (stack_space_to_allocate > (256 - offset - 8) | |
| 2188 ? (256 - offset - 8) : stack_space_to_allocate); | |
| 2189 | |
| 2190 mmix_emit_sp_add (-stack_chunk); | |
| 2191 offset += stack_chunk; | |
| 2192 stack_space_to_allocate -= stack_chunk; | |
| 2193 } | |
| 2194 | |
| 2195 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
| 2196 plus_constant (stack_pointer_rtx, | |
| 2197 offset)), | |
| 2198 gen_rtx_REG (DImode, regno)); | |
| 2199 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2200 offset -= 8; | |
| 2201 } | |
| 2202 | |
| 2203 /* Finally, allocate room for outgoing args and local vars if room | |
| 2204 wasn't allocated above. */ | |
| 2205 if (stack_space_to_allocate) | |
| 2206 mmix_emit_sp_add (-stack_space_to_allocate); | |
| 2207 } | |
| 2208 | |
| 2209 /* Expands the function epilogue into RTX. */ | |
| 2210 | |
| 2211 void | |
| 2212 mmix_expand_epilogue (void) | |
| 2213 { | |
| 2214 HOST_WIDE_INT locals_size = get_frame_size (); | |
| 2215 int regno; | |
| 2216 HOST_WIDE_INT stack_space_to_deallocate | |
| 2217 = (crtl->outgoing_args_size | |
| 2218 + crtl->args.pretend_args_size | |
| 2219 + locals_size + 7) & ~7; | |
| 2220 | |
| 2221 /* The first address to access is beyond the outgoing_args area. */ | |
| 2222 HOST_WIDE_INT offset = crtl->outgoing_args_size; | |
| 2223 | |
| 2224 /* Add the space for global non-register-stack registers. | |
| 2225 It is assumed that the frame-pointer register can be one of these | |
| 2226 registers, in which case it is excluded from the count when needed. */ | |
| 2227 for (regno = 255; | |
| 2228 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 2229 regno--) | |
| 2230 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 2231 && df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
| 2232 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 2233 stack_space_to_deallocate += 8; | |
| 2234 | |
| 2235 /* Add in the space for register stack-pointer. If so, always add room | |
| 2236 for the saved PC. */ | |
| 2237 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2238 stack_space_to_deallocate += 16; | |
| 2239 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2240 /* If we have a saved return-address slot, add it in. */ | |
| 2241 stack_space_to_deallocate += 8; | |
| 2242 | |
| 2243 /* Add in the frame-pointer. */ | |
| 2244 if (frame_pointer_needed) | |
| 2245 stack_space_to_deallocate += 8; | |
| 2246 | |
| 2247 /* Make sure we don't get an unaligned stack. */ | |
| 2248 if ((stack_space_to_deallocate % 8) != 0) | |
| 2249 internal_error ("stack frame not a multiple of octabyte: %wd", | |
| 2250 stack_space_to_deallocate); | |
| 2251 | |
| 2252 /* We will add back small offsets to the stack pointer as we go. | |
| 2253 First, we restore all registers that are global, i.e. not saved by | |
| 2254 the register file machinery. */ | |
| 2255 | |
| 2256 for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
| 2257 regno <= 255; | |
| 2258 regno++) | |
| 2259 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 2260 && df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
| 2261 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 2262 { | |
| 2263 if (offset > 255) | |
| 2264 { | |
| 2265 mmix_emit_sp_add (offset); | |
| 2266 stack_space_to_deallocate -= offset; | |
| 2267 offset = 0; | |
| 2268 } | |
| 2269 | |
| 2270 emit_move_insn (gen_rtx_REG (DImode, regno), | |
| 2271 gen_rtx_MEM (DImode, | |
| 2272 plus_constant (stack_pointer_rtx, | |
| 2273 offset))); | |
| 2274 offset += 8; | |
| 2275 } | |
| 2276 | |
| 2277 /* Here is where the local variables were. As in the prologue, they | |
| 2278 might be of an unaligned size. */ | |
| 2279 offset += (locals_size + 7) & ~7; | |
| 2280 | |
| 2281 /* The saved register stack pointer is just below the frame-pointer | |
| 2282 register. We don't need to restore it "manually"; the POP | |
| 2283 instruction does that. */ | |
| 2284 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2285 offset += 16; | |
| 2286 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2287 /* The return-address slot is just below the frame-pointer register. | |
| 2288 We don't need to restore it because we don't really use it. */ | |
| 2289 offset += 8; | |
| 2290 | |
| 2291 /* Get back the old frame-pointer-value. */ | |
| 2292 if (frame_pointer_needed) | |
| 2293 { | |
| 2294 if (offset > 255) | |
| 2295 { | |
| 2296 mmix_emit_sp_add (offset); | |
| 2297 | |
| 2298 stack_space_to_deallocate -= offset; | |
| 2299 offset = 0; | |
| 2300 } | |
| 2301 | |
| 2302 emit_move_insn (hard_frame_pointer_rtx, | |
| 2303 gen_rtx_MEM (DImode, | |
| 2304 plus_constant (stack_pointer_rtx, | |
| 2305 offset))); | |
| 2306 offset += 8; | |
| 2307 } | |
| 2308 | |
| 2309 /* We do not need to restore pretended incoming args, just add back | |
| 2310 offset to sp. */ | |
| 2311 if (stack_space_to_deallocate != 0) | |
| 2312 mmix_emit_sp_add (stack_space_to_deallocate); | |
| 2313 | |
| 2314 if (crtl->calls_eh_return) | |
| 2315 /* Adjust the (normal) stack-pointer to that of the receiver. | |
| 2316 FIXME: It would be nice if we could also adjust the register stack | |
| 2317 here, but we need to express it through DWARF 2 too. */ | |
| 2318 emit_insn (gen_adddi3 (stack_pointer_rtx, stack_pointer_rtx, | |
| 2319 gen_rtx_REG (DImode, | |
| 2320 MMIX_EH_RETURN_STACKADJ_REGNUM))); | |
| 2321 } | |
| 2322 | |
| 2323 /* Output an optimal sequence for setting a register to a specific | |
| 2324 constant. Used in an alternative for const_ints in movdi, and when | |
| 2325 using large stack-frame offsets. | |
| 2326 | |
| 2327 Use do_begin_end to say if a line-starting TAB and newline before the | |
| 2328 first insn and after the last insn is wanted. */ | |
| 2329 | |
| 2330 void | |
| 2331 mmix_output_register_setting (FILE *stream, | |
| 2332 int regno, | |
| 2333 HOST_WIDEST_INT value, | |
| 2334 int do_begin_end) | |
| 2335 { | |
| 2336 if (do_begin_end) | |
| 2337 fprintf (stream, "\t"); | |
| 2338 | |
| 2339 if (mmix_shiftable_wyde_value ((unsigned HOST_WIDEST_INT) value)) | |
| 2340 { | |
| 2341 /* First, the one-insn cases. */ | |
| 2342 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 2343 (unsigned HOST_WIDEST_INT) | |
| 2344 value); | |
| 2345 fprintf (stream, " %s,", reg_names[regno]); | |
| 2346 mmix_output_shifted_value (stream, (unsigned HOST_WIDEST_INT) value); | |
| 2347 } | |
| 2348 else if (mmix_shiftable_wyde_value (-(unsigned HOST_WIDEST_INT) value)) | |
| 2349 { | |
| 2350 /* We do this to get a bit more legible assembly code. The next | |
| 2351 alternative is mostly redundant with this. */ | |
| 2352 | |
| 2353 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 2354 -(unsigned HOST_WIDEST_INT) | |
| 2355 value); | |
| 2356 fprintf (stream, " %s,", reg_names[regno]); | |
| 2357 mmix_output_shifted_value (stream, -(unsigned HOST_WIDEST_INT) value); | |
| 2358 fprintf (stream, "\n\tNEGU %s,0,%s", reg_names[regno], | |
| 2359 reg_names[regno]); | |
| 2360 } | |
| 2361 else if (mmix_shiftable_wyde_value (~(unsigned HOST_WIDEST_INT) value)) | |
| 2362 { | |
| 2363 /* Slightly more expensive, the two-insn cases. */ | |
| 2364 | |
| 2365 /* FIXME: We could of course also test if 0..255-N or ~(N | 1..255) | |
| 2366 is shiftable, or any other one-insn transformation of the value. | |
| 2367 FIXME: Check first if the value is "shiftable" by two loading | |
| 2368 with two insns, since it makes more readable assembly code (if | |
| 2369 anyone else cares). */ | |
| 2370 | |
| 2371 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 2372 ~(unsigned HOST_WIDEST_INT) | |
| 2373 value); | |
| 2374 fprintf (stream, " %s,", reg_names[regno]); | |
| 2375 mmix_output_shifted_value (stream, ~(unsigned HOST_WIDEST_INT) value); | |
| 2376 fprintf (stream, "\n\tNOR %s,%s,0", reg_names[regno], | |
| 2377 reg_names[regno]); | |
| 2378 } | |
| 2379 else | |
| 2380 { | |
| 2381 /* The generic case. 2..4 insns. */ | |
| 2382 static const char *const higher_parts[] = {"L", "ML", "MH", "H"}; | |
| 2383 const char *op = "SET"; | |
| 2384 const char *line_begin = ""; | |
| 2385 int insns = 0; | |
| 2386 int i; | |
| 2387 HOST_WIDEST_INT tmpvalue = value; | |
| 2388 | |
| 2389 /* Compute the number of insns needed to output this constant. */ | |
| 2390 for (i = 0; i < 4 && tmpvalue != 0; i++) | |
| 2391 { | |
| 2392 if (tmpvalue & 65535) | |
| 2393 insns++; | |
| 2394 tmpvalue >>= 16; | |
| 2395 } | |
| 2396 if (TARGET_BASE_ADDRESSES && insns == 3) | |
| 2397 { | |
| 2398 /* The number three is based on a static observation on | |
| 2399 ghostscript-6.52. Two and four are excluded because there | |
| 2400 are too many such constants, and each unique constant (maybe | |
| 2401 offset by 1..255) were used few times compared to other uses, | |
| 2402 e.g. addresses. | |
| 2403 | |
| 2404 We use base-plus-offset addressing to force it into a global | |
| 2405 register; we just use a "LDA reg,VALUE", which will cause the | |
| 2406 assembler and linker to DTRT (for constants as well as | |
| 2407 addresses). */ | |
| 2408 fprintf (stream, "LDA %s,", reg_names[regno]); | |
| 2409 mmix_output_octa (stream, value, 0); | |
| 2410 } | |
| 2411 else | |
| 2412 { | |
| 2413 /* Output pertinent parts of the 4-wyde sequence. | |
| 2414 Still more to do if we want this to be optimal, but hey... | |
| 2415 Note that the zero case has been handled above. */ | |
| 2416 for (i = 0; i < 4 && value != 0; i++) | |
| 2417 { | |
| 2418 if (value & 65535) | |
| 2419 { | |
| 2420 fprintf (stream, "%s%s%s %s,#%x", line_begin, op, | |
| 2421 higher_parts[i], reg_names[regno], | |
| 2422 (int) (value & 65535)); | |
| 2423 /* The first one sets the rest of the bits to 0, the next | |
| 2424 ones add set bits. */ | |
| 2425 op = "INC"; | |
| 2426 line_begin = "\n\t"; | |
| 2427 } | |
| 2428 | |
| 2429 value >>= 16; | |
| 2430 } | |
| 2431 } | |
| 2432 } | |
| 2433 | |
| 2434 if (do_begin_end) | |
| 2435 fprintf (stream, "\n"); | |
| 2436 } | |
| 2437 | |
| 2438 /* Return 1 if value is 0..65535*2**(16*N) for N=0..3. | |
| 2439 else return 0. */ | |
| 2440 | |
| 2441 int | |
| 2442 mmix_shiftable_wyde_value (unsigned HOST_WIDEST_INT value) | |
| 2443 { | |
| 2444 /* Shift by 16 bits per group, stop when we've found two groups with | |
| 2445 nonzero bits. */ | |
| 2446 int i; | |
| 2447 int has_candidate = 0; | |
| 2448 | |
| 2449 for (i = 0; i < 4; i++) | |
| 2450 { | |
| 2451 if (value & 65535) | |
| 2452 { | |
| 2453 if (has_candidate) | |
| 2454 return 0; | |
| 2455 else | |
| 2456 has_candidate = 1; | |
| 2457 } | |
| 2458 | |
| 2459 value >>= 16; | |
| 2460 } | |
| 2461 | |
| 2462 return 1; | |
| 2463 } | |
| 2464 | |
|
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0
diff
changeset
|
2465 /* X and Y are two things to compare using CODE. Return the rtx for |
|
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parents:
0
diff
changeset
|
2466 the cc-reg in the proper mode. */ |
| 0 | 2467 |
| 2468 rtx | |
| 2469 mmix_gen_compare_reg (RTX_CODE code, rtx x, rtx y) | |
| 2470 { | |
| 2471 enum machine_mode ccmode = SELECT_CC_MODE (code, x, y); | |
|
55
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parents:
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diff
changeset
|
2472 return gen_reg_rtx (ccmode); |
| 0 | 2473 } |
| 2474 | |
| 2475 /* Local (static) helper functions. */ | |
| 2476 | |
| 2477 static void | |
| 2478 mmix_emit_sp_add (HOST_WIDE_INT offset) | |
| 2479 { | |
| 2480 rtx insn; | |
| 2481 | |
| 2482 if (offset < 0) | |
| 2483 { | |
| 2484 /* Negative stack-pointer adjustments are allocations and appear in | |
| 2485 the prologue only. We mark them as frame-related so unwind and | |
| 2486 debug info is properly emitted for them. */ | |
| 2487 if (offset > -255) | |
| 2488 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2489 stack_pointer_rtx, | |
| 2490 GEN_INT (offset))); | |
| 2491 else | |
| 2492 { | |
| 2493 rtx tmpr = gen_rtx_REG (DImode, 255); | |
| 2494 RTX_FRAME_RELATED_P (emit_move_insn (tmpr, GEN_INT (offset))) = 1; | |
| 2495 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2496 stack_pointer_rtx, tmpr)); | |
| 2497 } | |
| 2498 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2499 } | |
| 2500 else | |
| 2501 { | |
| 2502 /* Positive adjustments are in the epilogue only. Don't mark them | |
| 2503 as "frame-related" for unwind info. */ | |
| 2504 if (CONST_OK_FOR_LETTER_P (offset, 'L')) | |
| 2505 emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2506 stack_pointer_rtx, | |
| 2507 GEN_INT (offset))); | |
| 2508 else | |
| 2509 { | |
| 2510 rtx tmpr = gen_rtx_REG (DImode, 255); | |
| 2511 emit_move_insn (tmpr, GEN_INT (offset)); | |
| 2512 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2513 stack_pointer_rtx, tmpr)); | |
| 2514 } | |
| 2515 } | |
| 2516 } | |
| 2517 | |
| 2518 /* Print operator suitable for doing something with a shiftable | |
| 2519 wyde. The type of operator is passed as an asm output modifier. */ | |
| 2520 | |
| 2521 static void | |
| 2522 mmix_output_shiftvalue_op_from_str (FILE *stream, | |
| 2523 const char *mainop, | |
| 2524 HOST_WIDEST_INT value) | |
| 2525 { | |
| 2526 static const char *const op_part[] = {"L", "ML", "MH", "H"}; | |
| 2527 int i; | |
| 2528 | |
| 2529 if (! mmix_shiftable_wyde_value (value)) | |
| 2530 { | |
| 2531 char s[sizeof ("0xffffffffffffffff")]; | |
| 2532 sprintf (s, HOST_WIDEST_INT_PRINT_HEX, value); | |
| 2533 internal_error ("MMIX Internal: %s is not a shiftable int", s); | |
| 2534 } | |
| 2535 | |
| 2536 for (i = 0; i < 4; i++) | |
| 2537 { | |
| 2538 /* We know we're through when we find one-bits in the low | |
| 2539 16 bits. */ | |
| 2540 if (value & 0xffff) | |
| 2541 { | |
| 2542 fprintf (stream, "%s%s", mainop, op_part[i]); | |
| 2543 return; | |
| 2544 } | |
| 2545 value >>= 16; | |
| 2546 } | |
| 2547 | |
| 2548 /* No bits set? Then it must have been zero. */ | |
| 2549 fprintf (stream, "%sL", mainop); | |
| 2550 } | |
| 2551 | |
| 2552 /* Print a 64-bit value, optionally prefixed by assembly pseudo. */ | |
| 2553 | |
| 2554 static void | |
| 2555 mmix_output_octa (FILE *stream, HOST_WIDEST_INT value, int do_begin_end) | |
| 2556 { | |
| 2557 /* Snipped from final.c:output_addr_const. We need to avoid the | |
| 2558 presumed universal "0x" prefix. We can do it by replacing "0x" with | |
| 2559 "#0" here; we must avoid a space in the operands and no, the zero | |
| 2560 won't cause the number to be assumed in octal format. */ | |
| 2561 char hex_format[sizeof (HOST_WIDEST_INT_PRINT_HEX)]; | |
| 2562 | |
| 2563 if (do_begin_end) | |
| 2564 fprintf (stream, "\tOCTA "); | |
| 2565 | |
| 2566 strcpy (hex_format, HOST_WIDEST_INT_PRINT_HEX); | |
| 2567 hex_format[0] = '#'; | |
| 2568 hex_format[1] = '0'; | |
| 2569 | |
| 2570 /* Provide a few alternative output formats depending on the number, to | |
| 2571 improve legibility of assembler output. */ | |
| 2572 if ((value < (HOST_WIDEST_INT) 0 && value > (HOST_WIDEST_INT) -10000) | |
| 2573 || (value >= (HOST_WIDEST_INT) 0 && value <= (HOST_WIDEST_INT) 16384)) | |
| 2574 fprintf (stream, "%d", (int) value); | |
| 2575 else if (value > (HOST_WIDEST_INT) 0 | |
| 2576 && value < ((HOST_WIDEST_INT) 1 << 31) * 2) | |
| 2577 fprintf (stream, "#%x", (unsigned int) value); | |
| 2578 else | |
| 2579 fprintf (stream, hex_format, value); | |
| 2580 | |
| 2581 if (do_begin_end) | |
| 2582 fprintf (stream, "\n"); | |
| 2583 } | |
| 2584 | |
| 2585 /* Print the presumed shiftable wyde argument shifted into place (to | |
| 2586 be output with an operand). */ | |
| 2587 | |
| 2588 static void | |
| 2589 mmix_output_shifted_value (FILE *stream, HOST_WIDEST_INT value) | |
| 2590 { | |
| 2591 int i; | |
| 2592 | |
| 2593 if (! mmix_shiftable_wyde_value (value)) | |
| 2594 { | |
| 2595 char s[16+2+1]; | |
| 2596 sprintf (s, HOST_WIDEST_INT_PRINT_HEX, value); | |
| 2597 internal_error ("MMIX Internal: %s is not a shiftable int", s); | |
| 2598 } | |
| 2599 | |
| 2600 for (i = 0; i < 4; i++) | |
| 2601 { | |
| 2602 /* We know we're through when we find one-bits in the low 16 bits. */ | |
| 2603 if (value & 0xffff) | |
| 2604 { | |
| 2605 fprintf (stream, "#%x", (int) (value & 0xffff)); | |
| 2606 return; | |
| 2607 } | |
| 2608 | |
| 2609 value >>= 16; | |
| 2610 } | |
| 2611 | |
| 2612 /* No bits set? Then it must have been zero. */ | |
| 2613 fprintf (stream, "0"); | |
| 2614 } | |
| 2615 | |
| 2616 /* Output an MMIX condition name corresponding to an operator | |
| 2617 and operands: | |
| 2618 (comparison_operator [(comparison_operator ...) (const_int 0)]) | |
| 2619 which means we have to look at *two* operators. | |
| 2620 | |
| 2621 The argument "reversed" refers to reversal of the condition (not the | |
| 2622 same as swapping the arguments). */ | |
| 2623 | |
| 2624 static void | |
| 2625 mmix_output_condition (FILE *stream, rtx x, int reversed) | |
| 2626 { | |
| 2627 struct cc_conv | |
| 2628 { | |
| 2629 RTX_CODE cc; | |
| 2630 | |
| 2631 /* The normal output cc-code. */ | |
| 2632 const char *const normal; | |
| 2633 | |
| 2634 /* The reversed cc-code, or NULL if invalid. */ | |
| 2635 const char *const reversed; | |
| 2636 }; | |
| 2637 | |
| 2638 struct cc_type_conv | |
| 2639 { | |
| 2640 enum machine_mode cc_mode; | |
| 2641 | |
| 2642 /* Terminated with {UNKNOWN, NULL, NULL} */ | |
| 2643 const struct cc_conv *const convs; | |
| 2644 }; | |
| 2645 | |
| 2646 #undef CCEND | |
| 2647 #define CCEND {UNKNOWN, NULL, NULL} | |
| 2648 | |
| 2649 static const struct cc_conv cc_fun_convs[] | |
| 2650 = {{ORDERED, "Z", "P"}, | |
| 2651 {UNORDERED, "P", "Z"}, | |
| 2652 CCEND}; | |
| 2653 static const struct cc_conv cc_fp_convs[] | |
| 2654 = {{GT, "P", NULL}, | |
| 2655 {LT, "N", NULL}, | |
| 2656 CCEND}; | |
| 2657 static const struct cc_conv cc_fpeq_convs[] | |
| 2658 = {{NE, "Z", "P"}, | |
| 2659 {EQ, "P", "Z"}, | |
| 2660 CCEND}; | |
| 2661 static const struct cc_conv cc_uns_convs[] | |
| 2662 = {{GEU, "NN", "N"}, | |
| 2663 {GTU, "P", "NP"}, | |
| 2664 {LEU, "NP", "P"}, | |
| 2665 {LTU, "N", "NN"}, | |
| 2666 CCEND}; | |
| 2667 static const struct cc_conv cc_signed_convs[] | |
| 2668 = {{NE, "NZ", "Z"}, | |
| 2669 {EQ, "Z", "NZ"}, | |
| 2670 {GE, "NN", "N"}, | |
| 2671 {GT, "P", "NP"}, | |
| 2672 {LE, "NP", "P"}, | |
| 2673 {LT, "N", "NN"}, | |
| 2674 CCEND}; | |
| 2675 static const struct cc_conv cc_di_convs[] | |
| 2676 = {{NE, "NZ", "Z"}, | |
| 2677 {EQ, "Z", "NZ"}, | |
| 2678 {GE, "NN", "N"}, | |
| 2679 {GT, "P", "NP"}, | |
| 2680 {LE, "NP", "P"}, | |
| 2681 {LT, "N", "NN"}, | |
| 2682 {GTU, "NZ", "Z"}, | |
| 2683 {LEU, "Z", "NZ"}, | |
| 2684 CCEND}; | |
| 2685 #undef CCEND | |
| 2686 | |
| 2687 static const struct cc_type_conv cc_convs[] | |
| 2688 = {{CC_FUNmode, cc_fun_convs}, | |
| 2689 {CC_FPmode, cc_fp_convs}, | |
| 2690 {CC_FPEQmode, cc_fpeq_convs}, | |
| 2691 {CC_UNSmode, cc_uns_convs}, | |
| 2692 {CCmode, cc_signed_convs}, | |
| 2693 {DImode, cc_di_convs}}; | |
| 2694 | |
| 2695 size_t i; | |
| 2696 int j; | |
| 2697 | |
| 2698 enum machine_mode mode = GET_MODE (XEXP (x, 0)); | |
| 2699 RTX_CODE cc = GET_CODE (x); | |
| 2700 | |
| 2701 for (i = 0; i < ARRAY_SIZE (cc_convs); i++) | |
| 2702 { | |
| 2703 if (mode == cc_convs[i].cc_mode) | |
| 2704 { | |
| 2705 for (j = 0; cc_convs[i].convs[j].cc != UNKNOWN; j++) | |
| 2706 if (cc == cc_convs[i].convs[j].cc) | |
| 2707 { | |
| 2708 const char *mmix_cc | |
| 2709 = (reversed ? cc_convs[i].convs[j].reversed | |
| 2710 : cc_convs[i].convs[j].normal); | |
| 2711 | |
| 2712 if (mmix_cc == NULL) | |
| 2713 fatal_insn ("MMIX Internal: Trying to output invalidly\ | |
| 2714 reversed condition:", x); | |
| 2715 | |
| 2716 fprintf (stream, "%s", mmix_cc); | |
| 2717 return; | |
| 2718 } | |
| 2719 | |
| 2720 fatal_insn ("MMIX Internal: What's the CC of this?", x); | |
| 2721 } | |
| 2722 } | |
| 2723 | |
| 2724 fatal_insn ("MMIX Internal: What is the CC of this?", x); | |
| 2725 } | |
| 2726 | |
| 2727 /* Return the bit-value for a const_int or const_double. */ | |
| 2728 | |
| 2729 static HOST_WIDEST_INT | |
| 2730 mmix_intval (rtx x) | |
| 2731 { | |
| 2732 unsigned HOST_WIDEST_INT retval; | |
| 2733 | |
| 2734 if (GET_CODE (x) == CONST_INT) | |
| 2735 return INTVAL (x); | |
| 2736 | |
| 2737 /* We make a little song and dance because converting to long long in | |
| 2738 gcc-2.7.2 is broken. I still want people to be able to use it for | |
| 2739 cross-compilation to MMIX. */ | |
| 2740 if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == VOIDmode) | |
| 2741 { | |
| 2742 if (sizeof (HOST_WIDE_INT) < sizeof (HOST_WIDEST_INT)) | |
| 2743 { | |
| 2744 retval = (unsigned) CONST_DOUBLE_LOW (x) / 2; | |
| 2745 retval *= 2; | |
| 2746 retval |= CONST_DOUBLE_LOW (x) & 1; | |
| 2747 | |
| 2748 retval |= | |
| 2749 (unsigned HOST_WIDEST_INT) CONST_DOUBLE_HIGH (x) | |
|
67
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
2750 << (HOST_BITS_PER_LONG)/2 << (HOST_BITS_PER_LONG)/2; |
| 0 | 2751 } |
| 2752 else | |
| 2753 retval = CONST_DOUBLE_HIGH (x); | |
| 2754 | |
| 2755 return retval; | |
| 2756 } | |
| 2757 | |
| 2758 if (GET_CODE (x) == CONST_DOUBLE) | |
| 2759 { | |
| 2760 REAL_VALUE_TYPE value; | |
| 2761 | |
| 2762 /* FIXME: This macro is not in the manual but should be. */ | |
| 2763 REAL_VALUE_FROM_CONST_DOUBLE (value, x); | |
| 2764 | |
| 2765 if (GET_MODE (x) == DFmode) | |
| 2766 { | |
| 2767 long bits[2]; | |
| 2768 | |
| 2769 REAL_VALUE_TO_TARGET_DOUBLE (value, bits); | |
| 2770 | |
| 2771 /* The double cast is necessary to avoid getting the long | |
| 2772 sign-extended to unsigned long long(!) when they're of | |
| 2773 different size (usually 32-bit hosts). */ | |
| 2774 return | |
| 2775 ((unsigned HOST_WIDEST_INT) (unsigned long) bits[0] | |
| 2776 << (unsigned HOST_WIDEST_INT) 32U) | |
| 2777 | (unsigned HOST_WIDEST_INT) (unsigned long) bits[1]; | |
| 2778 } | |
| 2779 else if (GET_MODE (x) == SFmode) | |
| 2780 { | |
| 2781 long bits; | |
| 2782 REAL_VALUE_TO_TARGET_SINGLE (value, bits); | |
| 2783 | |
| 2784 return (unsigned long) bits; | |
| 2785 } | |
| 2786 } | |
| 2787 | |
| 2788 fatal_insn ("MMIX Internal: This is not a constant:", x); | |
| 2789 } | |
| 2790 | |
|
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2791 /* Worker function for TARGET_PROMOTE_FUNCTION_MODE. */ |
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2792 |
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2793 enum machine_mode |
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2794 mmix_promote_function_mode (const_tree type ATTRIBUTE_UNUSED, |
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2795 enum machine_mode mode, |
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2796 int *punsignedp ATTRIBUTE_UNUSED, |
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2797 const_tree fntype ATTRIBUTE_UNUSED, |
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2798 int for_return) |
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2799 { |
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2800 /* Apparently not doing TRT if int < register-size. FIXME: Perhaps |
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2801 FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say. */ |
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2802 if (for_return == 1) |
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2803 return mode; |
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2804 |
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2805 /* Promotion of modes currently generates slow code, extending before |
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2806 operation, so we do it only for arguments. */ |
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2807 if (GET_MODE_CLASS (mode) == MODE_INT |
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2808 && GET_MODE_SIZE (mode) < 8) |
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2809 return DImode; |
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2810 else |
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2811 return mode; |
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2812 } |
| 0 | 2813 /* Worker function for TARGET_STRUCT_VALUE_RTX. */ |
| 2814 | |
| 2815 static rtx | |
| 2816 mmix_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED, | |
| 2817 int incoming ATTRIBUTE_UNUSED) | |
| 2818 { | |
| 2819 return gen_rtx_REG (Pmode, MMIX_STRUCT_VALUE_REGNUM); | |
| 2820 } | |
| 2821 | |
|
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2822 /* Worker function for TARGET_FRAME_POINTER_REQUIRED. |
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2823 |
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2824 FIXME: Is this requirement built-in? Anyway, we should try to get rid |
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2825 of it; we can deduce the value. */ |
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2826 |
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2827 bool |
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2828 mmix_frame_pointer_required (void) |
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2829 { |
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2830 return (cfun->has_nonlocal_label); |
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2831 } |
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2832 |
| 0 | 2833 /* |
| 2834 * Local variables: | |
| 2835 * eval: (c-set-style "gnu") | |
| 2836 * indent-tabs-mode: t | |
| 2837 * End: | |
| 2838 */ |