Mercurial > hg > CbC > CbC_gcc
annotate gcc/config/mmix/mmix.c @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | f6334be47118 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* Definitions of target machine for GNU compiler, for MMIX. |
| 111 | 2 Copyright (C) 2000-2017 Free Software Foundation, Inc. |
| 0 | 3 Contributed by Hans-Peter Nilsson (hp@bitrange.com) |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify | |
| 8 it under the terms of the GNU General Public License as published by | |
| 9 the Free Software Foundation; either version 3, or (at your option) | |
| 10 any later version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 111 | 24 #include "backend.h" |
| 25 #include "target.h" | |
| 0 | 26 #include "rtl.h" |
| 27 #include "tree.h" | |
| 111 | 28 #include "stringpool.h" |
| 29 #include "attribs.h" | |
| 30 #include "df.h" | |
| 31 #include "memmodel.h" | |
| 32 #include "tm_p.h" | |
| 33 #include "insn-config.h" | |
| 34 #include "regs.h" | |
| 35 #include "emit-rtl.h" | |
| 36 #include "recog.h" | |
|
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37 #include "diagnostic-core.h" |
| 111 | 38 #include "output.h" |
| 39 #include "varasm.h" | |
| 40 #include "stor-layout.h" | |
| 41 #include "calls.h" | |
| 42 #include "explow.h" | |
| 43 #include "expr.h" | |
| 0 | 44 #include "dwarf2.h" |
| 111 | 45 #include "tm-constrs.h" |
| 46 #include "builtins.h" | |
| 47 | |
| 48 /* This file should be included last. */ | |
| 0 | 49 #include "target-def.h" |
| 50 | |
| 51 /* First some local helper definitions. */ | |
| 52 #define MMIX_FIRST_GLOBAL_REGNUM 32 | |
| 53 | |
| 54 /* We'd need a current_function_has_landing_pad. It's marked as such when | |
| 55 a nonlocal_goto_receiver is expanded. Not just a C++ thing, but | |
| 56 mostly. */ | |
| 57 #define MMIX_CFUN_HAS_LANDING_PAD (cfun->machine->has_landing_pad != 0) | |
| 58 | |
| 59 /* We have no means to tell DWARF 2 about the register stack, so we need | |
| 60 to store the return address on the stack if an exception can get into | |
| 61 this function. FIXME: Narrow condition. Before any whole-function | |
| 62 analysis, df_regs_ever_live_p () isn't initialized. We know it's up-to-date | |
| 63 after reload_completed; it may contain incorrect information some time | |
| 64 before that. Within a RTL sequence (after a call to start_sequence, | |
| 65 such as in RTL expanders), leaf_function_p doesn't see all insns | |
| 66 (perhaps any insn). But regs_ever_live is up-to-date when | |
| 67 leaf_function_p () isn't, so we "or" them together to get accurate | |
| 68 information. FIXME: Some tweak to leaf_function_p might be | |
| 69 preferable. */ | |
| 70 #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS \ | |
| 71 (flag_exceptions \ | |
| 72 && ((reload_completed && df_regs_ever_live_p (MMIX_rJ_REGNUM)) \ | |
| 73 || !leaf_function_p ())) | |
| 74 | |
| 75 #define IS_MMIX_EH_RETURN_DATA_REG(REGNO) \ | |
| 76 (crtl->calls_eh_return \ | |
| 77 && (EH_RETURN_DATA_REGNO (0) == REGNO \ | |
| 78 || EH_RETURN_DATA_REGNO (1) == REGNO \ | |
| 79 || EH_RETURN_DATA_REGNO (2) == REGNO \ | |
| 80 || EH_RETURN_DATA_REGNO (3) == REGNO)) | |
| 81 | |
| 82 /* For the default ABI, we rename registers at output-time to fill the gap | |
| 83 between the (statically partitioned) saved registers and call-clobbered | |
| 84 registers. In effect this makes unused call-saved registers to be used | |
| 85 as call-clobbered registers. The benefit comes from keeping the number | |
| 86 of local registers (value of rL) low, since there's a cost of | |
| 87 increasing rL and clearing unused (unset) registers with lower numbers. | |
| 88 Don't translate while outputting the prologue. */ | |
| 89 #define MMIX_OUTPUT_REGNO(N) \ | |
| 90 (TARGET_ABI_GNU \ | |
| 91 || (int) (N) < MMIX_RETURN_VALUE_REGNUM \ | |
| 92 || (int) (N) > MMIX_LAST_STACK_REGISTER_REGNUM \ | |
| 93 || cfun == NULL \ | |
| 94 || cfun->machine == NULL \ | |
| 95 || cfun->machine->in_prologue \ | |
| 96 ? (N) : ((N) - MMIX_RETURN_VALUE_REGNUM \ | |
| 97 + cfun->machine->highest_saved_stack_register + 1)) | |
| 98 | |
| 99 /* The %d in "POP %d,0". */ | |
| 100 #define MMIX_POP_ARGUMENT() \ | |
| 101 ((! TARGET_ABI_GNU \ | |
| 102 && crtl->return_rtx != NULL \ | |
| 103 && ! cfun->returns_struct) \ | |
| 104 ? (GET_CODE (crtl->return_rtx) == PARALLEL \ | |
| 105 ? GET_NUM_ELEM (XVEC (crtl->return_rtx, 0)) : 1) \ | |
| 106 : 0) | |
| 107 | |
| 108 /* The canonical saved comparison operands for non-cc0 machines, set in | |
| 109 the compare expander. */ | |
| 110 rtx mmix_compare_op0; | |
| 111 rtx mmix_compare_op1; | |
| 112 | |
| 113 /* Declarations of locals. */ | |
| 114 | |
| 115 /* Intermediate for insn output. */ | |
| 116 static int mmix_output_destination_register; | |
| 117 | |
|
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118 static void mmix_option_override (void); |
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119 static void mmix_asm_output_source_filename (FILE *, const char *); |
| 0 | 120 static void mmix_output_shiftvalue_op_from_str |
| 111 | 121 (FILE *, const char *, int64_t); |
| 122 static void mmix_output_shifted_value (FILE *, int64_t); | |
| 123 static void mmix_output_condition (FILE *, const_rtx, int); | |
| 124 static void mmix_output_octa (FILE *, int64_t, int); | |
| 0 | 125 static bool mmix_assemble_integer (rtx, unsigned int, int); |
| 126 static struct machine_function *mmix_init_machine_status (void); | |
| 127 static void mmix_encode_section_info (tree, rtx, int); | |
| 128 static const char *mmix_strip_name_encoding (const char *); | |
| 129 static void mmix_emit_sp_add (HOST_WIDE_INT offset); | |
| 111 | 130 static void mmix_target_asm_function_prologue (FILE *); |
| 0 | 131 static void mmix_target_asm_function_end_prologue (FILE *); |
| 111 | 132 static void mmix_target_asm_function_epilogue (FILE *); |
| 133 static reg_class_t mmix_preferred_reload_class (rtx, reg_class_t); | |
| 134 static reg_class_t mmix_preferred_output_reload_class (rtx, reg_class_t); | |
| 135 static bool mmix_legitimate_address_p (machine_mode, rtx, bool); | |
| 136 static bool mmix_legitimate_constant_p (machine_mode, rtx); | |
| 0 | 137 static void mmix_reorg (void); |
| 138 static void mmix_asm_output_mi_thunk | |
| 139 (FILE *, tree, HOST_WIDE_INT, HOST_WIDE_INT, tree); | |
| 140 static void mmix_setup_incoming_varargs | |
| 111 | 141 (cumulative_args_t, machine_mode, tree, int *, int); |
| 0 | 142 static void mmix_file_start (void); |
| 143 static void mmix_file_end (void); | |
| 111 | 144 static bool mmix_rtx_costs (rtx, machine_mode, int, int, int *, bool); |
| 145 static int mmix_register_move_cost (machine_mode, | |
| 146 reg_class_t, reg_class_t); | |
| 0 | 147 static rtx mmix_struct_value_rtx (tree, int); |
| 111 | 148 static machine_mode mmix_promote_function_mode (const_tree, |
| 149 machine_mode, | |
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150 int *, const_tree, int); |
| 111 | 151 static void mmix_function_arg_advance (cumulative_args_t, machine_mode, |
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152 const_tree, bool); |
| 111 | 153 static rtx mmix_function_arg_1 (const cumulative_args_t, machine_mode, |
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154 const_tree, bool, bool); |
| 111 | 155 static rtx mmix_function_incoming_arg (cumulative_args_t, machine_mode, |
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156 const_tree, bool); |
| 111 | 157 static rtx mmix_function_arg (cumulative_args_t, machine_mode, |
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158 const_tree, bool); |
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159 static rtx mmix_function_value (const_tree, const_tree, bool); |
| 111 | 160 static rtx mmix_libcall_value (machine_mode, const_rtx); |
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161 static bool mmix_function_value_regno_p (const unsigned int); |
| 111 | 162 static bool mmix_pass_by_reference (cumulative_args_t, |
| 163 machine_mode, const_tree, bool); | |
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164 static bool mmix_frame_pointer_required (void); |
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165 static void mmix_asm_trampoline_template (FILE *); |
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166 static void mmix_trampoline_init (rtx, tree, rtx); |
| 111 | 167 static void mmix_print_operand (FILE *, rtx, int); |
| 168 static void mmix_print_operand_address (FILE *, machine_mode, rtx); | |
| 169 static bool mmix_print_operand_punct_valid_p (unsigned char); | |
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170 static void mmix_conditional_register_usage (void); |
| 111 | 171 static HOST_WIDE_INT mmix_static_rtx_alignment (machine_mode); |
| 172 static HOST_WIDE_INT mmix_constant_alignment (const_tree, HOST_WIDE_INT); | |
| 173 static HOST_WIDE_INT mmix_starting_frame_offset (void); | |
| 0 | 174 |
| 175 /* Target structure macros. Listed by node. See `Using and Porting GCC' | |
| 176 for a general description. */ | |
| 177 | |
| 178 /* Node: Function Entry */ | |
| 179 | |
| 180 #undef TARGET_ASM_BYTE_OP | |
| 181 #define TARGET_ASM_BYTE_OP NULL | |
| 182 #undef TARGET_ASM_ALIGNED_HI_OP | |
| 183 #define TARGET_ASM_ALIGNED_HI_OP NULL | |
| 184 #undef TARGET_ASM_ALIGNED_SI_OP | |
| 185 #define TARGET_ASM_ALIGNED_SI_OP NULL | |
| 186 #undef TARGET_ASM_ALIGNED_DI_OP | |
| 187 #define TARGET_ASM_ALIGNED_DI_OP NULL | |
| 188 #undef TARGET_ASM_INTEGER | |
| 189 #define TARGET_ASM_INTEGER mmix_assemble_integer | |
| 190 | |
| 191 #undef TARGET_ASM_FUNCTION_PROLOGUE | |
| 192 #define TARGET_ASM_FUNCTION_PROLOGUE mmix_target_asm_function_prologue | |
| 193 | |
| 194 #undef TARGET_ASM_FUNCTION_END_PROLOGUE | |
| 195 #define TARGET_ASM_FUNCTION_END_PROLOGUE mmix_target_asm_function_end_prologue | |
| 196 | |
| 197 #undef TARGET_ASM_FUNCTION_EPILOGUE | |
| 198 #define TARGET_ASM_FUNCTION_EPILOGUE mmix_target_asm_function_epilogue | |
| 199 | |
| 111 | 200 #undef TARGET_PRINT_OPERAND |
| 201 #define TARGET_PRINT_OPERAND mmix_print_operand | |
| 202 #undef TARGET_PRINT_OPERAND_ADDRESS | |
| 203 #define TARGET_PRINT_OPERAND_ADDRESS mmix_print_operand_address | |
| 204 #undef TARGET_PRINT_OPERAND_PUNCT_VALID_P | |
| 205 #define TARGET_PRINT_OPERAND_PUNCT_VALID_P mmix_print_operand_punct_valid_p | |
| 206 | |
| 0 | 207 #undef TARGET_ENCODE_SECTION_INFO |
| 208 #define TARGET_ENCODE_SECTION_INFO mmix_encode_section_info | |
| 209 #undef TARGET_STRIP_NAME_ENCODING | |
| 210 #define TARGET_STRIP_NAME_ENCODING mmix_strip_name_encoding | |
| 211 | |
| 212 #undef TARGET_ASM_OUTPUT_MI_THUNK | |
| 213 #define TARGET_ASM_OUTPUT_MI_THUNK mmix_asm_output_mi_thunk | |
| 214 #undef TARGET_ASM_CAN_OUTPUT_MI_THUNK | |
| 215 #define TARGET_ASM_CAN_OUTPUT_MI_THUNK default_can_output_mi_thunk_no_vcall | |
| 216 #undef TARGET_ASM_FILE_START | |
| 217 #define TARGET_ASM_FILE_START mmix_file_start | |
| 218 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE | |
| 219 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true | |
| 220 #undef TARGET_ASM_FILE_END | |
| 221 #define TARGET_ASM_FILE_END mmix_file_end | |
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222 #undef TARGET_ASM_OUTPUT_SOURCE_FILENAME |
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223 #define TARGET_ASM_OUTPUT_SOURCE_FILENAME mmix_asm_output_source_filename |
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224 |
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225 #undef TARGET_CONDITIONAL_REGISTER_USAGE |
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226 #define TARGET_CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage |
| 0 | 227 |
| 228 #undef TARGET_RTX_COSTS | |
| 229 #define TARGET_RTX_COSTS mmix_rtx_costs | |
| 230 #undef TARGET_ADDRESS_COST | |
| 111 | 231 #define TARGET_ADDRESS_COST hook_int_rtx_mode_as_bool_0 |
| 232 | |
| 233 #undef TARGET_REGISTER_MOVE_COST | |
| 234 #define TARGET_REGISTER_MOVE_COST mmix_register_move_cost | |
| 0 | 235 |
| 236 #undef TARGET_MACHINE_DEPENDENT_REORG | |
| 237 #define TARGET_MACHINE_DEPENDENT_REORG mmix_reorg | |
| 238 | |
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239 #undef TARGET_PROMOTE_FUNCTION_MODE |
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240 #define TARGET_PROMOTE_FUNCTION_MODE mmix_promote_function_mode |
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241 |
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242 #undef TARGET_FUNCTION_VALUE |
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243 #define TARGET_FUNCTION_VALUE mmix_function_value |
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244 #undef TARGET_LIBCALL_VALUE |
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245 #define TARGET_LIBCALL_VALUE mmix_libcall_value |
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246 #undef TARGET_FUNCTION_VALUE_REGNO_P |
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247 #define TARGET_FUNCTION_VALUE_REGNO_P mmix_function_value_regno_p |
| 0 | 248 |
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249 #undef TARGET_FUNCTION_ARG |
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250 #define TARGET_FUNCTION_ARG mmix_function_arg |
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251 #undef TARGET_FUNCTION_INCOMING_ARG |
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252 #define TARGET_FUNCTION_INCOMING_ARG mmix_function_incoming_arg |
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253 #undef TARGET_FUNCTION_ARG_ADVANCE |
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254 #define TARGET_FUNCTION_ARG_ADVANCE mmix_function_arg_advance |
| 0 | 255 #undef TARGET_STRUCT_VALUE_RTX |
| 256 #define TARGET_STRUCT_VALUE_RTX mmix_struct_value_rtx | |
| 257 #undef TARGET_SETUP_INCOMING_VARARGS | |
| 258 #define TARGET_SETUP_INCOMING_VARARGS mmix_setup_incoming_varargs | |
| 259 #undef TARGET_PASS_BY_REFERENCE | |
| 260 #define TARGET_PASS_BY_REFERENCE mmix_pass_by_reference | |
| 261 #undef TARGET_CALLEE_COPIES | |
| 262 #define TARGET_CALLEE_COPIES hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true | |
| 111 | 263 |
| 264 #undef TARGET_PREFERRED_RELOAD_CLASS | |
| 265 #define TARGET_PREFERRED_RELOAD_CLASS mmix_preferred_reload_class | |
| 266 #undef TARGET_PREFERRED_OUTPUT_RELOAD_CLASS | |
| 267 #define TARGET_PREFERRED_OUTPUT_RELOAD_CLASS mmix_preferred_output_reload_class | |
| 268 | |
| 269 #undef TARGET_LRA_P | |
| 270 #define TARGET_LRA_P hook_bool_void_false | |
| 0 | 271 |
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272 #undef TARGET_LEGITIMATE_ADDRESS_P |
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273 #define TARGET_LEGITIMATE_ADDRESS_P mmix_legitimate_address_p |
| 111 | 274 #undef TARGET_LEGITIMATE_CONSTANT_P |
| 275 #define TARGET_LEGITIMATE_CONSTANT_P mmix_legitimate_constant_p | |
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276 |
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277 #undef TARGET_FRAME_POINTER_REQUIRED |
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278 #define TARGET_FRAME_POINTER_REQUIRED mmix_frame_pointer_required |
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279 |
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280 #undef TARGET_ASM_TRAMPOLINE_TEMPLATE |
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281 #define TARGET_ASM_TRAMPOLINE_TEMPLATE mmix_asm_trampoline_template |
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282 #undef TARGET_TRAMPOLINE_INIT |
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283 #define TARGET_TRAMPOLINE_INIT mmix_trampoline_init |
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284 |
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285 #undef TARGET_OPTION_OVERRIDE |
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286 #define TARGET_OPTION_OVERRIDE mmix_option_override |
| 111 | 287 |
| 288 #undef TARGET_STATIC_RTX_ALIGNMENT | |
| 289 #define TARGET_STATIC_RTX_ALIGNMENT mmix_static_rtx_alignment | |
| 290 #undef TARGET_CONSTANT_ALIGNMENT | |
| 291 #define TARGET_CONSTANT_ALIGNMENT mmix_constant_alignment | |
| 292 | |
| 293 #undef TARGET_STARTING_FRAME_OFFSET | |
| 294 #define TARGET_STARTING_FRAME_OFFSET mmix_starting_frame_offset | |
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295 |
| 0 | 296 struct gcc_target targetm = TARGET_INITIALIZER; |
| 297 | |
| 298 /* Functions that are expansions for target macros. | |
| 299 See Target Macros in `Using and Porting GCC'. */ | |
| 300 | |
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301 /* TARGET_OPTION_OVERRIDE. */ |
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302 |
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303 static void |
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304 mmix_option_override (void) |
| 0 | 305 { |
| 306 /* Should we err or should we warn? Hmm. At least we must neutralize | |
| 307 it. For example the wrong kind of case-tables will be generated with | |
| 308 PIC; we use absolute address items for mmixal compatibility. FIXME: | |
| 309 They could be relative if we just elide them to after all pertinent | |
| 310 labels. */ | |
| 311 if (flag_pic) | |
| 312 { | |
| 313 warning (0, "-f%s not supported: ignored", (flag_pic > 1) ? "PIC" : "pic"); | |
| 314 flag_pic = 0; | |
| 315 } | |
| 316 } | |
| 317 | |
| 318 /* INIT_EXPANDERS. */ | |
| 319 | |
| 320 void | |
| 321 mmix_init_expanders (void) | |
| 322 { | |
| 323 init_machine_status = mmix_init_machine_status; | |
| 324 } | |
| 325 | |
| 326 /* Set the per-function data. */ | |
| 327 | |
| 328 static struct machine_function * | |
| 329 mmix_init_machine_status (void) | |
| 330 { | |
| 111 | 331 return ggc_cleared_alloc<machine_function> (); |
| 0 | 332 } |
| 333 | |
| 111 | 334 /* DATA_ABI_ALIGNMENT. |
| 0 | 335 We have trouble getting the address of stuff that is located at other |
| 336 than 32-bit alignments (GETA requirements), so try to give everything | |
| 337 at least 32-bit alignment. */ | |
| 338 | |
| 339 int | |
| 340 mmix_data_alignment (tree type ATTRIBUTE_UNUSED, int basic_align) | |
| 341 { | |
| 342 if (basic_align < 32) | |
| 343 return 32; | |
| 344 | |
| 345 return basic_align; | |
| 346 } | |
| 347 | |
| 111 | 348 /* Implement TARGET_STATIC_RTX_ALIGNMENT. */ |
| 349 | |
| 350 static HOST_WIDE_INT | |
| 351 mmix_static_rtx_alignment (machine_mode mode) | |
| 352 { | |
| 353 return MAX (GET_MODE_ALIGNMENT (mode), 32); | |
| 354 } | |
| 355 | |
| 356 /* Implement tARGET_CONSTANT_ALIGNMENT. */ | |
| 357 | |
| 358 static HOST_WIDE_INT | |
| 359 mmix_constant_alignment (const_tree, HOST_WIDE_INT basic_align) | |
| 0 | 360 { |
| 361 if (basic_align < 32) | |
| 362 return 32; | |
| 363 | |
| 364 return basic_align; | |
| 365 } | |
| 366 | |
| 367 /* LOCAL_ALIGNMENT. */ | |
| 368 | |
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369 unsigned |
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370 mmix_local_alignment (tree type ATTRIBUTE_UNUSED, unsigned basic_align) |
| 0 | 371 { |
| 372 if (basic_align < 32) | |
| 373 return 32; | |
| 374 | |
| 375 return basic_align; | |
| 376 } | |
| 377 | |
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378 /* TARGET_CONDITIONAL_REGISTER_USAGE. */ |
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379 |
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380 static void |
| 0 | 381 mmix_conditional_register_usage (void) |
| 382 { | |
| 383 int i; | |
| 384 | |
| 385 if (TARGET_ABI_GNU) | |
| 386 { | |
| 387 static const int gnu_abi_reg_alloc_order[] | |
| 388 = MMIX_GNU_ABI_REG_ALLOC_ORDER; | |
| 389 | |
| 390 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 391 reg_alloc_order[i] = gnu_abi_reg_alloc_order[i]; | |
| 392 | |
| 393 /* Change the default from the mmixware ABI. For the GNU ABI, | |
| 394 $15..$30 are call-saved just as $0..$14. There must be one | |
| 395 call-clobbered local register for the "hole" that holds the | |
| 396 number of saved local registers saved by PUSHJ/PUSHGO during the | |
| 397 function call, receiving the return value at return. So best is | |
| 398 to use the highest, $31. It's already marked call-clobbered for | |
| 399 the mmixware ABI. */ | |
| 400 for (i = 15; i <= 30; i++) | |
| 401 call_used_regs[i] = 0; | |
| 402 | |
| 403 /* "Unfix" the parameter registers. */ | |
| 404 for (i = MMIX_RESERVED_GNU_ARG_0_REGNUM; | |
| 405 i < MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS; | |
| 406 i++) | |
| 407 fixed_regs[i] = 0; | |
| 408 } | |
| 409 | |
| 410 /* Step over the ":" in special register names. */ | |
| 411 if (! TARGET_TOPLEVEL_SYMBOLS) | |
| 412 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 413 if (reg_names[i][0] == ':') | |
| 414 reg_names[i]++; | |
| 415 } | |
| 416 | |
| 417 /* INCOMING_REGNO and OUTGOING_REGNO worker function. | |
| 418 Those two macros must only be applied to function argument | |
| 111 | 419 registers and the function return value register for the opposite |
| 420 use. FIXME: for their current use in gcc, it'd be better with an | |
| 421 explicit specific additional FUNCTION_INCOMING_ARG_REGNO_P a'la | |
| 422 TARGET_FUNCTION_ARG / TARGET_FUNCTION_INCOMING_ARG instead of | |
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423 forcing the target to commit to a fixed mapping and for any |
| 111 | 424 unspecified register use. Particularly when thinking about the |
| 425 return-value, it is better to imagine INCOMING_REGNO and | |
| 426 OUTGOING_REGNO as named CALLEE_TO_CALLER_REGNO and INNER_REGNO as | |
| 427 named CALLER_TO_CALLEE_REGNO because the direction. The "incoming" | |
| 428 and "outgoing" is from the perspective of the parameter-registers, | |
| 429 but the same macro is (must be, lacking an alternative like | |
| 430 suggested above) used to map the return-value-register from the | |
| 431 same perspective. To make directions even more confusing, the macro | |
| 432 MMIX_OUTGOING_RETURN_VALUE_REGNUM holds the number of the register | |
| 433 in which to return a value, i.e. INCOMING_REGNO for the return-value- | |
| 434 register as received from a called function; the return-value on the | |
| 435 way out. */ | |
| 0 | 436 |
| 437 int | |
| 438 mmix_opposite_regno (int regno, int incoming) | |
| 439 { | |
| 111 | 440 if (incoming && regno == MMIX_OUTGOING_RETURN_VALUE_REGNUM) |
| 441 return MMIX_RETURN_VALUE_REGNUM; | |
| 442 | |
| 443 if (!incoming && regno == MMIX_RETURN_VALUE_REGNUM) | |
| 444 return MMIX_OUTGOING_RETURN_VALUE_REGNUM; | |
| 445 | |
| 0 | 446 if (!mmix_function_arg_regno_p (regno, incoming)) |
| 447 return regno; | |
| 448 | |
| 449 return | |
| 450 regno - (incoming | |
| 451 ? MMIX_FIRST_INCOMING_ARG_REGNUM - MMIX_FIRST_ARG_REGNUM | |
| 452 : MMIX_FIRST_ARG_REGNUM - MMIX_FIRST_INCOMING_ARG_REGNUM); | |
| 453 } | |
| 454 | |
| 455 /* LOCAL_REGNO. | |
| 456 All registers that are part of the register stack and that will be | |
| 457 saved are local. */ | |
| 458 | |
| 459 int | |
| 460 mmix_local_regno (int regno) | |
| 461 { | |
| 462 return regno <= MMIX_LAST_STACK_REGISTER_REGNUM && !call_used_regs[regno]; | |
| 463 } | |
| 464 | |
| 111 | 465 /* TARGET_PREFERRED_RELOAD_CLASS. |
| 0 | 466 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ |
| 467 | |
| 111 | 468 static reg_class_t |
| 469 mmix_preferred_reload_class (rtx x, reg_class_t rclass) | |
| 0 | 470 { |
| 471 /* FIXME: Revisit. */ | |
| 472 return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
| 473 ? REMAINDER_REG : rclass; | |
| 474 } | |
| 475 | |
| 111 | 476 /* TARGET_PREFERRED_OUTPUT_RELOAD_CLASS. |
| 0 | 477 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ |
| 478 | |
| 111 | 479 static reg_class_t |
| 480 mmix_preferred_output_reload_class (rtx x, reg_class_t rclass) | |
| 0 | 481 { |
| 482 /* FIXME: Revisit. */ | |
| 483 return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
| 484 ? REMAINDER_REG : rclass; | |
| 485 } | |
| 486 | |
| 487 /* SECONDARY_RELOAD_CLASS. | |
| 488 We need to reload regs of REMAINDER_REG and HIMULT_REG elsewhere. */ | |
| 489 | |
| 490 enum reg_class | |
| 491 mmix_secondary_reload_class (enum reg_class rclass, | |
| 111 | 492 machine_mode mode ATTRIBUTE_UNUSED, |
| 0 | 493 rtx x ATTRIBUTE_UNUSED, |
| 494 int in_p ATTRIBUTE_UNUSED) | |
| 495 { | |
| 496 if (rclass == REMAINDER_REG | |
| 497 || rclass == HIMULT_REG | |
| 498 || rclass == SYSTEM_REGS) | |
| 499 return GENERAL_REGS; | |
| 500 | |
| 501 return NO_REGS; | |
| 502 } | |
| 503 | |
| 504 /* DYNAMIC_CHAIN_ADDRESS. */ | |
| 505 | |
| 506 rtx | |
| 507 mmix_dynamic_chain_address (rtx frame) | |
| 508 { | |
| 509 /* FIXME: the frame-pointer is stored at offset -8 from the current | |
| 510 frame-pointer. Unfortunately, the caller assumes that a | |
| 511 frame-pointer is present for *all* previous frames. There should be | |
| 512 a way to say that that cannot be done, like for RETURN_ADDR_RTX. */ | |
| 111 | 513 return plus_constant (Pmode, frame, -8); |
| 0 | 514 } |
| 515 | |
| 111 | 516 /* Implement TARGET_STARTING_FRAME_OFFSET. */ |
| 517 | |
| 518 static HOST_WIDE_INT | |
| 0 | 519 mmix_starting_frame_offset (void) |
| 520 { | |
| 521 /* The old frame pointer is in the slot below the new one, so | |
| 522 FIRST_PARM_OFFSET does not need to depend on whether the | |
| 523 frame-pointer is needed or not. We have to adjust for the register | |
| 524 stack pointer being located below the saved frame pointer. | |
| 525 Similarly, we store the return address on the stack too, for | |
| 526 exception handling, and always if we save the register stack pointer. */ | |
| 527 return | |
| 528 (-8 | |
| 529 + (MMIX_CFUN_HAS_LANDING_PAD | |
| 530 ? -16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? -8 : 0))); | |
| 531 } | |
| 532 | |
| 533 /* RETURN_ADDR_RTX. */ | |
| 534 | |
| 535 rtx | |
| 536 mmix_return_addr_rtx (int count, rtx frame ATTRIBUTE_UNUSED) | |
| 537 { | |
| 538 return count == 0 | |
| 539 ? (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS | |
| 540 /* FIXME: Set frame_alias_set on the following. (Why?) | |
| 541 See mmix_initial_elimination_offset for the reason we can't use | |
| 542 get_hard_reg_initial_val for both. Always using a stack slot | |
| 543 and not a register would be suboptimal. */ | |
| 111 | 544 ? validize_mem (gen_rtx_MEM (Pmode, |
| 545 plus_constant (Pmode, | |
| 546 frame_pointer_rtx, -16))) | |
| 0 | 547 : get_hard_reg_initial_val (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)) |
| 548 : NULL_RTX; | |
| 549 } | |
| 550 | |
| 551 /* SETUP_FRAME_ADDRESSES. */ | |
| 552 | |
| 553 void | |
| 554 mmix_setup_frame_addresses (void) | |
| 555 { | |
| 556 /* Nothing needed at the moment. */ | |
| 557 } | |
| 558 | |
| 559 /* The difference between the (imaginary) frame pointer and the stack | |
| 560 pointer. Used to eliminate the frame pointer. */ | |
| 561 | |
| 562 int | |
| 563 mmix_initial_elimination_offset (int fromreg, int toreg) | |
| 564 { | |
| 565 int regno; | |
| 566 int fp_sp_offset | |
| 567 = (get_frame_size () + crtl->outgoing_args_size + 7) & ~7; | |
| 568 | |
| 569 /* There is no actual offset between these two virtual values, but for | |
| 570 the frame-pointer, we have the old one in the stack position below | |
| 571 it, so the offset for the frame-pointer to the stack-pointer is one | |
| 572 octabyte larger. */ | |
| 573 if (fromreg == MMIX_ARG_POINTER_REGNUM | |
| 574 && toreg == MMIX_FRAME_POINTER_REGNUM) | |
| 575 return 0; | |
| 576 | |
| 577 /* The difference is the size of local variables plus the size of | |
| 578 outgoing function arguments that would normally be passed as | |
| 579 registers but must be passed on stack because we're out of | |
| 580 function-argument registers. Only global saved registers are | |
| 581 counted; the others go on the register stack. | |
| 582 | |
| 583 The frame-pointer is counted too if it is what is eliminated, as we | |
| 111 | 584 need to balance the offset for it from TARGET_STARTING_FRAME_OFFSET. |
| 0 | 585 |
| 586 Also add in the slot for the register stack pointer we save if we | |
| 587 have a landing pad. | |
| 588 | |
| 589 Unfortunately, we can't access $0..$14, from unwinder code easily, so | |
| 590 store the return address in a frame slot too. FIXME: Only for | |
| 591 non-leaf functions. FIXME: Always with a landing pad, because it's | |
| 592 hard to know whether we need the other at the time we know we need | |
| 593 the offset for one (and have to state it). It's a kludge until we | |
| 594 can express the register stack in the EH frame info. | |
| 595 | |
| 596 We have to do alignment here; get_frame_size will not return a | |
| 597 multiple of STACK_BOUNDARY. FIXME: Add note in manual. */ | |
| 598 | |
| 599 for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
| 600 regno <= 255; | |
| 601 regno++) | |
| 602 if ((df_regs_ever_live_p (regno) && ! call_used_regs[regno]) | |
| 603 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 604 fp_sp_offset += 8; | |
| 605 | |
| 606 return fp_sp_offset | |
| 607 + (MMIX_CFUN_HAS_LANDING_PAD | |
| 608 ? 16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? 8 : 0)) | |
| 609 + (fromreg == MMIX_ARG_POINTER_REGNUM ? 0 : 8); | |
| 610 } | |
| 611 | |
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612 static void |
| 111 | 613 mmix_function_arg_advance (cumulative_args_t argsp_v, machine_mode mode, |
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614 const_tree type, bool named ATTRIBUTE_UNUSED) |
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615 { |
| 111 | 616 CUMULATIVE_ARGS *argsp = get_cumulative_args (argsp_v); |
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617 int arg_size = MMIX_FUNCTION_ARG_SIZE (mode, type); |
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618 |
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619 argsp->regs = ((targetm.calls.must_pass_in_stack (mode, type) |
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620 || (arg_size > 8 |
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621 && !TARGET_LIBFUNC |
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622 && !argsp->lib)) |
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623 ? (MMIX_MAX_ARGS_IN_REGS) + 1 |
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624 : argsp->regs + (7 + arg_size) / 8); |
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625 } |
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626 |
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627 /* Helper function for mmix_function_arg and mmix_function_incoming_arg. */ |
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628 |
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629 static rtx |
| 111 | 630 mmix_function_arg_1 (const cumulative_args_t argsp_v, |
| 631 machine_mode mode, | |
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632 const_tree type, |
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633 bool named ATTRIBUTE_UNUSED, |
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634 bool incoming) |
| 0 | 635 { |
| 111 | 636 CUMULATIVE_ARGS *argsp = get_cumulative_args (argsp_v); |
| 637 | |
| 0 | 638 /* Last-argument marker. */ |
| 639 if (type == void_type_node) | |
| 640 return (argsp->regs < MMIX_MAX_ARGS_IN_REGS) | |
| 641 ? gen_rtx_REG (mode, | |
| 642 (incoming | |
| 643 ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
| 644 : MMIX_FIRST_ARG_REGNUM) + argsp->regs) | |
| 645 : NULL_RTX; | |
| 646 | |
| 647 return (argsp->regs < MMIX_MAX_ARGS_IN_REGS | |
| 648 && !targetm.calls.must_pass_in_stack (mode, type) | |
| 649 && (GET_MODE_BITSIZE (mode) <= 64 | |
| 650 || argsp->lib | |
| 651 || TARGET_LIBFUNC)) | |
| 652 ? gen_rtx_REG (mode, | |
| 653 (incoming | |
| 654 ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
| 655 : MMIX_FIRST_ARG_REGNUM) | |
| 656 + argsp->regs) | |
| 657 : NULL_RTX; | |
| 658 } | |
| 659 | |
|
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660 /* Return an rtx for a function argument to go in a register, and 0 for |
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661 one that must go on stack. */ |
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662 |
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663 static rtx |
| 111 | 664 mmix_function_arg (cumulative_args_t argsp, |
| 665 machine_mode mode, | |
|
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666 const_tree type, |
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667 bool named) |
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668 { |
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669 return mmix_function_arg_1 (argsp, mode, type, named, false); |
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670 } |
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671 |
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672 static rtx |
| 111 | 673 mmix_function_incoming_arg (cumulative_args_t argsp, |
| 674 machine_mode mode, | |
|
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675 const_tree type, |
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676 bool named) |
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677 { |
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678 return mmix_function_arg_1 (argsp, mode, type, named, true); |
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679 } |
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680 |
| 0 | 681 /* Returns nonzero for everything that goes by reference, 0 for |
| 682 everything that goes by value. */ | |
| 683 | |
| 684 static bool | |
| 111 | 685 mmix_pass_by_reference (cumulative_args_t argsp_v, machine_mode mode, |
| 0 | 686 const_tree type, bool named ATTRIBUTE_UNUSED) |
| 687 { | |
| 111 | 688 CUMULATIVE_ARGS *argsp = get_cumulative_args (argsp_v); |
| 689 | |
| 0 | 690 /* FIXME: Check: I'm not sure the must_pass_in_stack check is |
| 691 necessary. */ | |
| 692 if (targetm.calls.must_pass_in_stack (mode, type)) | |
| 693 return true; | |
| 694 | |
| 695 if (MMIX_FUNCTION_ARG_SIZE (mode, type) > 8 | |
| 696 && !TARGET_LIBFUNC | |
| 697 && (!argsp || !argsp->lib)) | |
| 698 return true; | |
| 699 | |
| 700 return false; | |
| 701 } | |
| 702 | |
| 703 /* Return nonzero if regno is a register number where a parameter is | |
| 704 passed, and 0 otherwise. */ | |
| 705 | |
| 706 int | |
| 707 mmix_function_arg_regno_p (int regno, int incoming) | |
| 708 { | |
| 709 int first_arg_regnum | |
| 710 = incoming ? MMIX_FIRST_INCOMING_ARG_REGNUM : MMIX_FIRST_ARG_REGNUM; | |
| 711 | |
| 712 return regno >= first_arg_regnum | |
| 713 && regno < first_arg_regnum + MMIX_MAX_ARGS_IN_REGS; | |
| 714 } | |
| 715 | |
|
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716 /* Implements TARGET_FUNCTION_VALUE. */ |
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717 |
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718 static rtx |
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719 mmix_function_value (const_tree valtype, |
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720 const_tree func ATTRIBUTE_UNUSED, |
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721 bool outgoing) |
| 0 | 722 { |
| 111 | 723 machine_mode mode = TYPE_MODE (valtype); |
| 724 machine_mode cmode; | |
| 0 | 725 int first_val_regnum = MMIX_OUTGOING_RETURN_VALUE_REGNUM; |
| 726 rtx vec[MMIX_MAX_REGS_FOR_VALUE]; | |
| 727 int i; | |
| 728 int nregs; | |
| 729 | |
|
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730 if (!outgoing) |
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731 return gen_rtx_REG (mode, MMIX_RETURN_VALUE_REGNUM); |
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732 |
| 0 | 733 /* Return values that fit in a register need no special handling. |
| 734 There's no register hole when parameters are passed in global | |
| 735 registers. */ | |
| 736 if (TARGET_ABI_GNU | |
| 737 || GET_MODE_BITSIZE (mode) <= BITS_PER_WORD) | |
| 738 return | |
| 739 gen_rtx_REG (mode, MMIX_OUTGOING_RETURN_VALUE_REGNUM); | |
| 740 | |
| 741 if (COMPLEX_MODE_P (mode)) | |
| 742 /* A complex type, made up of components. */ | |
| 743 cmode = TYPE_MODE (TREE_TYPE (valtype)); | |
| 744 else | |
| 745 { | |
| 746 /* Of the other larger-than-register modes, we only support | |
| 747 scalar mode TImode. (At least, that's the only one that's | |
| 748 been rudimentally tested.) Make sure we're alerted for | |
| 749 unexpected cases. */ | |
| 750 if (mode != TImode) | |
| 751 sorry ("support for mode %qs", GET_MODE_NAME (mode)); | |
| 752 | |
| 753 /* In any case, we will fill registers to the natural size. */ | |
| 754 cmode = DImode; | |
| 755 } | |
| 756 | |
| 757 nregs = ((GET_MODE_BITSIZE (mode) + BITS_PER_WORD - 1) / BITS_PER_WORD); | |
| 758 | |
| 759 /* We need to take care of the effect of the register hole on return | |
| 760 values of large sizes; the last register will appear as the first | |
| 761 register, with the rest shifted. (For complex modes, this is just | |
| 762 swapped registers.) */ | |
| 763 | |
| 764 if (nregs > MMIX_MAX_REGS_FOR_VALUE) | |
| 765 internal_error ("too large function value type, needs %d registers,\ | |
| 766 have only %d registers for this", nregs, MMIX_MAX_REGS_FOR_VALUE); | |
| 767 | |
| 768 /* FIXME: Maybe we should handle structure values like this too | |
| 769 (adjusted for BLKmode), perhaps for both ABI:s. */ | |
| 770 for (i = 0; i < nregs - 1; i++) | |
| 771 vec[i] | |
| 772 = gen_rtx_EXPR_LIST (VOIDmode, | |
| 773 gen_rtx_REG (cmode, first_val_regnum + i), | |
| 774 GEN_INT ((i + 1) * BITS_PER_UNIT)); | |
| 775 | |
| 776 vec[nregs - 1] | |
| 777 = gen_rtx_EXPR_LIST (VOIDmode, | |
| 778 gen_rtx_REG (cmode, first_val_regnum + nregs - 1), | |
| 779 const0_rtx); | |
| 780 | |
| 111 | 781 return gen_rtx_PARALLEL (mode, gen_rtvec_v (nregs, vec)); |
| 0 | 782 } |
| 783 | |
|
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784 /* Implements TARGET_LIBCALL_VALUE. */ |
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785 |
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786 static rtx |
| 111 | 787 mmix_libcall_value (machine_mode mode, |
|
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788 const_rtx fun ATTRIBUTE_UNUSED) |
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789 { |
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790 return gen_rtx_REG (mode, MMIX_RETURN_VALUE_REGNUM); |
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791 } |
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792 |
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793 /* Implements TARGET_FUNCTION_VALUE_REGNO_P. */ |
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794 |
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795 static bool |
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796 mmix_function_value_regno_p (const unsigned int regno) |
| 0 | 797 { |
| 798 return regno == MMIX_RETURN_VALUE_REGNUM; | |
| 799 } | |
| 800 | |
| 801 /* EH_RETURN_DATA_REGNO. */ | |
| 802 | |
| 803 int | |
| 804 mmix_eh_return_data_regno (int n) | |
| 805 { | |
| 806 if (n >= 0 && n < 4) | |
| 807 return MMIX_EH_RETURN_DATA_REGNO_START + n; | |
| 808 | |
| 809 return INVALID_REGNUM; | |
| 810 } | |
| 811 | |
| 812 /* EH_RETURN_STACKADJ_RTX. */ | |
| 813 | |
| 814 rtx | |
| 815 mmix_eh_return_stackadj_rtx (void) | |
| 816 { | |
| 817 return gen_rtx_REG (Pmode, MMIX_EH_RETURN_STACKADJ_REGNUM); | |
| 818 } | |
| 819 | |
| 820 /* EH_RETURN_HANDLER_RTX. */ | |
| 821 | |
| 822 rtx | |
| 823 mmix_eh_return_handler_rtx (void) | |
| 824 { | |
| 825 return gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM); | |
| 826 } | |
| 827 | |
| 828 /* ASM_PREFERRED_EH_DATA_FORMAT. */ | |
| 829 | |
| 830 int | |
| 831 mmix_asm_preferred_eh_data_format (int code ATTRIBUTE_UNUSED, | |
| 832 int global ATTRIBUTE_UNUSED) | |
| 833 { | |
| 834 /* This is the default (was at 2001-07-20). Revisit when needed. */ | |
| 835 return DW_EH_PE_absptr; | |
| 836 } | |
| 837 | |
| 838 /* Make a note that we've seen the beginning of the prologue. This | |
| 839 matters to whether we'll translate register numbers as calculated by | |
| 840 mmix_reorg. */ | |
| 841 | |
| 842 static void | |
| 111 | 843 mmix_target_asm_function_prologue (FILE *) |
| 0 | 844 { |
| 845 cfun->machine->in_prologue = 1; | |
| 846 } | |
| 847 | |
| 848 /* Make a note that we've seen the end of the prologue. */ | |
| 849 | |
| 850 static void | |
| 851 mmix_target_asm_function_end_prologue (FILE *stream ATTRIBUTE_UNUSED) | |
| 852 { | |
| 853 cfun->machine->in_prologue = 0; | |
| 854 } | |
| 855 | |
| 856 /* Implement TARGET_MACHINE_DEPENDENT_REORG. No actual rearrangements | |
| 857 done here; just virtually by calculating the highest saved stack | |
| 858 register number used to modify the register numbers at output time. */ | |
| 859 | |
| 860 static void | |
| 861 mmix_reorg (void) | |
| 862 { | |
| 863 int regno; | |
| 864 | |
| 865 /* We put the number of the highest saved register-file register in a | |
| 866 location convenient for the call-patterns to output. Note that we | |
| 867 don't tell dwarf2 about these registers, since it can't restore them | |
| 868 anyway. */ | |
| 869 for (regno = MMIX_LAST_STACK_REGISTER_REGNUM; | |
| 870 regno >= 0; | |
| 871 regno--) | |
| 872 if ((df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
| 873 || (regno == MMIX_FRAME_POINTER_REGNUM && frame_pointer_needed)) | |
| 874 break; | |
| 875 | |
| 876 /* Regardless of whether they're saved (they might be just read), we | |
| 877 mustn't include registers that carry parameters. We could scan the | |
| 878 insns to see whether they're actually used (and indeed do other less | |
| 879 trivial register usage analysis and transformations), but it seems | |
| 880 wasteful to optimize for unused parameter registers. As of | |
| 881 2002-04-30, df_regs_ever_live_p (n) seems to be set for only-reads too, but | |
| 882 that might change. */ | |
| 883 if (!TARGET_ABI_GNU && regno < crtl->args.info.regs - 1) | |
| 884 { | |
| 885 regno = crtl->args.info.regs - 1; | |
| 886 | |
| 887 /* We don't want to let this cause us to go over the limit and make | |
| 888 incoming parameter registers be misnumbered and treating the last | |
| 889 parameter register and incoming return value register call-saved. | |
| 890 Stop things at the unmodified scheme. */ | |
| 891 if (regno > MMIX_RETURN_VALUE_REGNUM - 1) | |
| 892 regno = MMIX_RETURN_VALUE_REGNUM - 1; | |
| 893 } | |
| 894 | |
| 895 cfun->machine->highest_saved_stack_register = regno; | |
| 896 } | |
| 897 | |
| 898 /* TARGET_ASM_FUNCTION_EPILOGUE. */ | |
| 899 | |
| 900 static void | |
| 111 | 901 mmix_target_asm_function_epilogue (FILE *stream) |
| 0 | 902 { |
| 903 /* Emit an \n for readability of the generated assembly. */ | |
| 904 fputc ('\n', stream); | |
| 905 } | |
| 906 | |
| 907 /* TARGET_ASM_OUTPUT_MI_THUNK. */ | |
| 908 | |
| 909 static void | |
| 910 mmix_asm_output_mi_thunk (FILE *stream, | |
| 911 tree fndecl ATTRIBUTE_UNUSED, | |
| 912 HOST_WIDE_INT delta, | |
| 913 HOST_WIDE_INT vcall_offset ATTRIBUTE_UNUSED, | |
| 914 tree func) | |
| 915 { | |
| 916 /* If you define TARGET_STRUCT_VALUE_RTX that returns 0 (i.e. pass | |
| 917 location of structure to return as invisible first argument), you | |
| 918 need to tweak this code too. */ | |
| 919 const char *regname = reg_names[MMIX_FIRST_INCOMING_ARG_REGNUM]; | |
| 920 | |
| 921 if (delta >= 0 && delta < 65536) | |
| 922 fprintf (stream, "\tINCL %s,%d\n", regname, (int)delta); | |
| 923 else if (delta < 0 && delta >= -255) | |
| 924 fprintf (stream, "\tSUBU %s,%s,%d\n", regname, regname, (int)-delta); | |
| 925 else | |
| 926 { | |
| 927 mmix_output_register_setting (stream, 255, delta, 1); | |
| 928 fprintf (stream, "\tADDU %s,%s,$255\n", regname, regname); | |
| 929 } | |
| 930 | |
| 931 fprintf (stream, "\tJMP "); | |
| 932 assemble_name (stream, XSTR (XEXP (DECL_RTL (func), 0), 0)); | |
| 933 fprintf (stream, "\n"); | |
| 934 } | |
| 935 | |
| 936 /* FUNCTION_PROFILER. */ | |
| 937 | |
| 938 void | |
| 939 mmix_function_profiler (FILE *stream ATTRIBUTE_UNUSED, | |
| 940 int labelno ATTRIBUTE_UNUSED) | |
| 941 { | |
| 942 sorry ("function_profiler support for MMIX"); | |
| 943 } | |
| 944 | |
| 945 /* Worker function for TARGET_SETUP_INCOMING_VARARGS. For the moment, | |
| 946 let's stick to pushing argument registers on the stack. Later, we | |
| 947 can parse all arguments in registers, to improve performance. */ | |
| 948 | |
| 949 static void | |
| 111 | 950 mmix_setup_incoming_varargs (cumulative_args_t args_so_farp_v, |
| 951 machine_mode mode, | |
| 0 | 952 tree vartype, |
| 953 int *pretend_sizep, | |
| 954 int second_time ATTRIBUTE_UNUSED) | |
| 955 { | |
| 111 | 956 CUMULATIVE_ARGS *args_so_farp = get_cumulative_args (args_so_farp_v); |
| 957 | |
| 0 | 958 /* The last named variable has been handled, but |
| 959 args_so_farp has not been advanced for it. */ | |
| 960 if (args_so_farp->regs + 1 < MMIX_MAX_ARGS_IN_REGS) | |
| 961 *pretend_sizep = (MMIX_MAX_ARGS_IN_REGS - (args_so_farp->regs + 1)) * 8; | |
| 962 | |
| 963 /* We assume that one argument takes up one register here. That should | |
| 964 be true until we start messing with multi-reg parameters. */ | |
| 965 if ((7 + (MMIX_FUNCTION_ARG_SIZE (mode, vartype))) / 8 != 1) | |
| 966 internal_error ("MMIX Internal: Last named vararg would not fit in a register"); | |
| 967 } | |
| 968 | |
|
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969 /* TARGET_ASM_TRAMPOLINE_TEMPLATE. */ |
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970 |
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971 static void |
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972 mmix_asm_trampoline_template (FILE *stream) |
| 0 | 973 { |
| 974 /* Read a value into the static-chain register and jump somewhere. The | |
| 975 static chain is stored at offset 16, and the function address is | |
| 976 stored at offset 24. */ | |
|
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977 |
| 0 | 978 fprintf (stream, "\tGETA $255,1F\n\t"); |
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979 fprintf (stream, "LDOU %s,$255,0\n\t", reg_names[MMIX_STATIC_CHAIN_REGNUM]); |
| 0 | 980 fprintf (stream, "LDOU $255,$255,8\n\t"); |
| 981 fprintf (stream, "GO $255,$255,0\n"); | |
| 982 fprintf (stream, "1H\tOCTA 0\n\t"); | |
| 983 fprintf (stream, "OCTA 0\n"); | |
| 984 } | |
| 985 | |
|
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986 /* TARGET_TRAMPOLINE_INIT. */ |
| 0 | 987 /* Set the static chain and function pointer field in the trampoline. |
| 988 We also SYNCID here to be sure (doesn't matter in the simulator, but | |
| 989 some day it will). */ | |
| 990 | |
|
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991 static void |
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992 mmix_trampoline_init (rtx m_tramp, tree fndecl, rtx static_chain) |
| 0 | 993 { |
|
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994 rtx fnaddr = XEXP (DECL_RTL (fndecl), 0); |
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995 rtx mem; |
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996 |
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997 emit_block_move (m_tramp, assemble_trampoline_template (), |
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998 GEN_INT (2*UNITS_PER_WORD), BLOCK_OP_NORMAL); |
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999 |
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1000 mem = adjust_address (m_tramp, DImode, 2*UNITS_PER_WORD); |
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1001 emit_move_insn (mem, static_chain); |
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1002 mem = adjust_address (m_tramp, DImode, 3*UNITS_PER_WORD); |
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1003 emit_move_insn (mem, fnaddr); |
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1004 |
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1005 mem = adjust_address (m_tramp, DImode, 0); |
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1006 emit_insn (gen_sync_icache (mem, GEN_INT (TRAMPOLINE_SIZE - 1))); |
| 0 | 1007 } |
| 1008 | |
| 1009 /* We must exclude constant addresses that have an increment that is not a | |
| 1010 multiple of four bytes because of restrictions of the GETA | |
| 1011 instruction, unless TARGET_BASE_ADDRESSES. */ | |
| 1012 | |
| 1013 int | |
| 1014 mmix_constant_address_p (rtx x) | |
| 1015 { | |
| 1016 RTX_CODE code = GET_CODE (x); | |
| 1017 int addend = 0; | |
| 1018 /* When using "base addresses", anything constant goes. */ | |
| 1019 int constant_ok = TARGET_BASE_ADDRESSES != 0; | |
| 1020 | |
| 1021 switch (code) | |
| 1022 { | |
| 1023 case LABEL_REF: | |
| 1024 case SYMBOL_REF: | |
| 1025 return 1; | |
| 1026 | |
| 1027 case HIGH: | |
| 1028 /* FIXME: Don't know how to dissect these. Avoid them for now, | |
| 1029 except we know they're constants. */ | |
| 1030 return constant_ok; | |
| 1031 | |
| 1032 case CONST_INT: | |
| 1033 addend = INTVAL (x); | |
| 1034 break; | |
| 1035 | |
| 1036 case CONST_DOUBLE: | |
| 1037 if (GET_MODE (x) != VOIDmode) | |
| 1038 /* Strange that we got here. FIXME: Check if we do. */ | |
| 1039 return constant_ok; | |
| 1040 addend = CONST_DOUBLE_LOW (x); | |
| 1041 break; | |
| 1042 | |
| 1043 case CONST: | |
| 1044 /* Note that expressions with arithmetic on forward references don't | |
| 1045 work in mmixal. People using gcc assembly code with mmixal might | |
| 1046 need to move arrays and such to before the point of use. */ | |
| 1047 if (GET_CODE (XEXP (x, 0)) == PLUS) | |
| 1048 { | |
| 1049 rtx x0 = XEXP (XEXP (x, 0), 0); | |
| 1050 rtx x1 = XEXP (XEXP (x, 0), 1); | |
| 1051 | |
| 1052 if ((GET_CODE (x0) == SYMBOL_REF | |
| 1053 || GET_CODE (x0) == LABEL_REF) | |
| 1054 && (GET_CODE (x1) == CONST_INT | |
| 1055 || (GET_CODE (x1) == CONST_DOUBLE | |
| 1056 && GET_MODE (x1) == VOIDmode))) | |
| 1057 addend = mmix_intval (x1); | |
| 1058 else | |
| 1059 return constant_ok; | |
| 1060 } | |
| 1061 else | |
| 1062 return constant_ok; | |
| 1063 break; | |
| 1064 | |
| 1065 default: | |
| 1066 return 0; | |
| 1067 } | |
| 1068 | |
| 1069 return constant_ok || (addend & 3) == 0; | |
| 1070 } | |
| 1071 | |
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1072 /* Return 1 if the address is OK, otherwise 0. */ |
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1073 |
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1074 bool |
| 111 | 1075 mmix_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED, |
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1076 rtx x, |
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1077 bool strict_checking) |
| 0 | 1078 { |
| 1079 #define MMIX_REG_OK(X) \ | |
| 1080 ((strict_checking \ | |
| 1081 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
| 1082 || (reg_renumber[REGNO (X)] > 0 \ | |
| 1083 && reg_renumber[REGNO (X)] <= MMIX_LAST_GENERAL_REGISTER))) \ | |
| 1084 || (!strict_checking \ | |
| 1085 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
| 1086 || REGNO (X) >= FIRST_PSEUDO_REGISTER \ | |
| 1087 || REGNO (X) == ARG_POINTER_REGNUM))) | |
| 1088 | |
| 1089 /* We only accept: | |
| 1090 (mem reg) | |
| 1091 (mem (plus reg reg)) | |
| 1092 (mem (plus reg 0..255)). | |
| 1093 unless TARGET_BASE_ADDRESSES, in which case we accept all | |
| 1094 (mem constant_address) too. */ | |
| 1095 | |
| 1096 | |
| 1097 /* (mem reg) */ | |
| 1098 if (REG_P (x) && MMIX_REG_OK (x)) | |
| 1099 return 1; | |
| 1100 | |
| 1101 if (GET_CODE(x) == PLUS) | |
| 1102 { | |
| 1103 rtx x1 = XEXP (x, 0); | |
| 1104 rtx x2 = XEXP (x, 1); | |
| 1105 | |
| 1106 /* Try swapping the order. FIXME: Do we need this? */ | |
| 1107 if (! REG_P (x1)) | |
| 1108 { | |
| 1109 rtx tem = x1; | |
| 1110 x1 = x2; | |
| 1111 x2 = tem; | |
| 1112 } | |
| 1113 | |
| 1114 /* (mem (plus (reg?) (?))) */ | |
| 1115 if (!REG_P (x1) || !MMIX_REG_OK (x1)) | |
| 1116 return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); | |
| 1117 | |
| 1118 /* (mem (plus (reg) (reg?))) */ | |
| 1119 if (REG_P (x2) && MMIX_REG_OK (x2)) | |
| 1120 return 1; | |
| 1121 | |
| 1122 /* (mem (plus (reg) (0..255?))) */ | |
| 111 | 1123 if (satisfies_constraint_I (x2)) |
| 0 | 1124 return 1; |
| 1125 | |
| 1126 return 0; | |
| 1127 } | |
| 1128 | |
| 1129 return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); | |
| 1130 } | |
| 1131 | |
| 111 | 1132 /* Implement TARGET_LEGITIMATE_CONSTANT_P. */ |
| 1133 | |
| 1134 static bool | |
| 1135 mmix_legitimate_constant_p (machine_mode mode ATTRIBUTE_UNUSED, rtx x) | |
| 0 | 1136 { |
| 1137 RTX_CODE code = GET_CODE (x); | |
| 1138 | |
| 1139 /* We must allow any number due to the way the cse passes works; if we | |
| 1140 do not allow any number here, general_operand will fail, and insns | |
| 1141 will fatally fail recognition instead of "softly". */ | |
| 1142 if (code == CONST_INT || code == CONST_DOUBLE) | |
| 1143 return 1; | |
| 1144 | |
| 1145 return CONSTANT_ADDRESS_P (x); | |
| 1146 } | |
| 1147 | |
| 1148 /* SELECT_CC_MODE. */ | |
| 1149 | |
| 111 | 1150 machine_mode |
| 0 | 1151 mmix_select_cc_mode (RTX_CODE op, rtx x, rtx y ATTRIBUTE_UNUSED) |
| 1152 { | |
| 1153 /* We use CCmode, CC_UNSmode, CC_FPmode, CC_FPEQmode and CC_FUNmode to | |
| 1154 output different compare insns. Note that we do not check the | |
| 1155 validity of the comparison here. */ | |
| 1156 | |
| 1157 if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) | |
| 1158 { | |
| 1159 if (op == ORDERED || op == UNORDERED || op == UNGE | |
| 1160 || op == UNGT || op == UNLE || op == UNLT) | |
| 1161 return CC_FUNmode; | |
| 1162 | |
| 1163 if (op == EQ || op == NE) | |
| 1164 return CC_FPEQmode; | |
| 1165 | |
| 1166 return CC_FPmode; | |
| 1167 } | |
| 1168 | |
| 1169 if (op == GTU || op == LTU || op == GEU || op == LEU) | |
| 1170 return CC_UNSmode; | |
| 1171 | |
| 1172 return CCmode; | |
| 1173 } | |
| 1174 | |
| 1175 /* REVERSIBLE_CC_MODE. */ | |
| 1176 | |
| 1177 int | |
| 111 | 1178 mmix_reversible_cc_mode (machine_mode mode) |
| 0 | 1179 { |
| 1180 /* That is, all integer and the EQ, NE, ORDERED and UNORDERED float | |
| 1181 compares. */ | |
| 1182 return mode != CC_FPmode; | |
| 1183 } | |
| 1184 | |
| 1185 /* TARGET_RTX_COSTS. */ | |
| 1186 | |
| 1187 static bool | |
| 1188 mmix_rtx_costs (rtx x ATTRIBUTE_UNUSED, | |
| 111 | 1189 machine_mode mode ATTRIBUTE_UNUSED, |
| 0 | 1190 int outer_code ATTRIBUTE_UNUSED, |
| 111 | 1191 int opno ATTRIBUTE_UNUSED, |
| 0 | 1192 int *total ATTRIBUTE_UNUSED, |
| 1193 bool speed ATTRIBUTE_UNUSED) | |
| 1194 { | |
| 1195 /* For the time being, this is just a stub and we'll accept the | |
| 1196 generic calculations, until we can do measurements, at least. | |
| 1197 Say we did not modify any calculated costs. */ | |
| 1198 return false; | |
| 1199 } | |
| 1200 | |
| 111 | 1201 /* TARGET_REGISTER_MOVE_COST. |
| 1202 | |
| 1203 The special registers can only move to and from general regs, and we | |
| 1204 need to check that their constraints match, so say 3 for them. */ | |
| 1205 | |
| 1206 static int | |
| 1207 mmix_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED, | |
| 1208 reg_class_t from, | |
| 1209 reg_class_t to) | |
| 0 | 1210 { |
| 1211 return (from == GENERAL_REGS && from == to) ? 2 : 3; | |
| 1212 } | |
| 1213 | |
| 1214 /* Note that we don't have a TEXT_SECTION_ASM_OP, because it has to be a | |
| 1215 compile-time constant; it's used in an asm in crtstuff.c, compiled for | |
| 1216 the target. */ | |
| 1217 | |
| 1218 /* DATA_SECTION_ASM_OP. */ | |
| 1219 | |
| 1220 const char * | |
| 1221 mmix_data_section_asm_op (void) | |
| 1222 { | |
| 1223 return "\t.data ! mmixal:= 8H LOC 9B"; | |
| 1224 } | |
| 1225 | |
| 1226 static void | |
| 1227 mmix_encode_section_info (tree decl, rtx rtl, int first) | |
| 1228 { | |
| 1229 /* Test for an external declaration, and do nothing if it is one. */ | |
| 1230 if ((TREE_CODE (decl) == VAR_DECL | |
| 1231 && (DECL_EXTERNAL (decl) || TREE_PUBLIC (decl))) | |
| 1232 || (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))) | |
| 1233 ; | |
| 1234 else if (first && DECL_P (decl)) | |
| 1235 { | |
| 1236 /* For non-visible declarations, add a "@" prefix, which we skip | |
| 1237 when the label is output. If the label does not have this | |
| 1238 prefix, a ":" is output if -mtoplevel-symbols. | |
| 1239 | |
| 1240 Note that this does not work for data that is declared extern and | |
| 1241 later defined as static. If there's code in between, that code | |
| 1242 will refer to the extern declaration, and vice versa. This just | |
| 1243 means that when -mtoplevel-symbols is in use, we can just handle | |
| 1244 well-behaved ISO-compliant code. */ | |
| 1245 | |
| 1246 const char *str = XSTR (XEXP (rtl, 0), 0); | |
| 1247 int len = strlen (str); | |
| 1248 char *newstr = XALLOCAVEC (char, len + 2); | |
| 1249 newstr[0] = '@'; | |
| 1250 strcpy (newstr + 1, str); | |
| 1251 XSTR (XEXP (rtl, 0), 0) = ggc_alloc_string (newstr, len + 1); | |
| 1252 } | |
| 1253 | |
| 1254 /* Set SYMBOL_REF_FLAG for things that we want to access with GETA. We | |
| 1255 may need different options to reach for different things with GETA. | |
| 1256 For now, functions and things we know or have been told are constant. */ | |
| 1257 if (TREE_CODE (decl) == FUNCTION_DECL | |
| 1258 || TREE_CONSTANT (decl) | |
| 1259 || (TREE_CODE (decl) == VAR_DECL | |
| 1260 && TREE_READONLY (decl) | |
| 1261 && !TREE_SIDE_EFFECTS (decl) | |
| 1262 && (!DECL_INITIAL (decl) | |
| 1263 || TREE_CONSTANT (DECL_INITIAL (decl))))) | |
| 1264 SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; | |
| 1265 } | |
| 1266 | |
| 1267 static const char * | |
| 1268 mmix_strip_name_encoding (const char *name) | |
| 1269 { | |
| 1270 for (; (*name == '@' || *name == '*'); name++) | |
| 1271 ; | |
| 1272 | |
| 1273 return name; | |
| 1274 } | |
| 1275 | |
| 1276 /* TARGET_ASM_FILE_START. | |
| 1277 We just emit a little comment for the time being. */ | |
| 1278 | |
| 1279 static void | |
| 1280 mmix_file_start (void) | |
| 1281 { | |
| 1282 default_file_start (); | |
| 1283 | |
| 1284 fputs ("! mmixal:= 8H LOC Data_Section\n", asm_out_file); | |
| 1285 | |
| 1286 /* Make sure each file starts with the text section. */ | |
| 1287 switch_to_section (text_section); | |
| 1288 } | |
| 1289 | |
| 1290 /* TARGET_ASM_FILE_END. */ | |
| 1291 | |
| 1292 static void | |
| 1293 mmix_file_end (void) | |
| 1294 { | |
| 1295 /* Make sure each file ends with the data section. */ | |
| 1296 switch_to_section (data_section); | |
| 1297 } | |
| 1298 | |
|
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1299 /* TARGET_ASM_OUTPUT_SOURCE_FILENAME. */ |
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1300 |
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1301 static void |
| 0 | 1302 mmix_asm_output_source_filename (FILE *stream, const char *name) |
| 1303 { | |
| 1304 fprintf (stream, "# 1 "); | |
| 1305 OUTPUT_QUOTED_STRING (stream, name); | |
| 1306 fprintf (stream, "\n"); | |
| 1307 } | |
| 1308 | |
| 1309 /* OUTPUT_QUOTED_STRING. */ | |
| 1310 | |
| 1311 void | |
| 1312 mmix_output_quoted_string (FILE *stream, const char *string, int length) | |
| 1313 { | |
| 1314 const char * string_end = string + length; | |
| 1315 static const char *const unwanted_chars = "\"[]\\"; | |
| 1316 | |
| 1317 /* Output "any character except newline and double quote character". We | |
| 1318 play it safe and avoid all control characters too. We also do not | |
| 1319 want [] as characters, should input be passed through m4 with [] as | |
| 1320 quotes. Further, we avoid "\", because the GAS port handles it as a | |
| 1321 quoting character. */ | |
| 1322 while (string < string_end) | |
| 1323 { | |
| 1324 if (*string | |
| 1325 && (unsigned char) *string < 128 | |
| 1326 && !ISCNTRL (*string) | |
| 1327 && strchr (unwanted_chars, *string) == NULL) | |
| 1328 { | |
| 1329 fputc ('"', stream); | |
| 1330 while (*string | |
| 1331 && (unsigned char) *string < 128 | |
| 1332 && !ISCNTRL (*string) | |
| 1333 && strchr (unwanted_chars, *string) == NULL | |
| 1334 && string < string_end) | |
| 1335 { | |
| 1336 fputc (*string, stream); | |
| 1337 string++; | |
| 1338 } | |
| 1339 fputc ('"', stream); | |
| 1340 if (string < string_end) | |
| 1341 fprintf (stream, ","); | |
| 1342 } | |
| 1343 if (string < string_end) | |
| 1344 { | |
| 1345 fprintf (stream, "#%x", *string & 255); | |
| 1346 string++; | |
| 1347 if (string < string_end) | |
| 1348 fprintf (stream, ","); | |
| 1349 } | |
| 1350 } | |
| 1351 } | |
| 1352 | |
| 1353 /* Target hook for assembling integer objects. Use mmix_print_operand | |
| 1354 for WYDE and TETRA. Use mmix_output_octa to output 8-byte | |
| 1355 CONST_DOUBLEs. */ | |
| 1356 | |
| 1357 static bool | |
| 1358 mmix_assemble_integer (rtx x, unsigned int size, int aligned_p) | |
| 1359 { | |
| 1360 if (aligned_p) | |
| 1361 switch (size) | |
| 1362 { | |
| 1363 /* We handle a limited number of types of operands in here. But | |
| 1364 that's ok, because we can punt to generic functions. We then | |
| 1365 pretend that aligned data isn't needed, so the usual .<pseudo> | |
| 1366 syntax is used (which works for aligned data too). We actually | |
| 1367 *must* do that, since we say we don't have simple aligned | |
| 1368 pseudos, causing this function to be called. We just try and | |
| 1369 keep as much compatibility as possible with mmixal syntax for | |
| 1370 normal cases (i.e. without GNU extensions and C only). */ | |
| 1371 case 1: | |
| 1372 if (GET_CODE (x) != CONST_INT) | |
| 1373 { | |
| 1374 aligned_p = 0; | |
| 1375 break; | |
| 1376 } | |
| 1377 fputs ("\tBYTE\t", asm_out_file); | |
| 1378 mmix_print_operand (asm_out_file, x, 'B'); | |
| 1379 fputc ('\n', asm_out_file); | |
| 1380 return true; | |
| 1381 | |
| 1382 case 2: | |
| 1383 if (GET_CODE (x) != CONST_INT) | |
| 1384 { | |
| 1385 aligned_p = 0; | |
| 1386 break; | |
| 1387 } | |
| 1388 fputs ("\tWYDE\t", asm_out_file); | |
| 1389 mmix_print_operand (asm_out_file, x, 'W'); | |
| 1390 fputc ('\n', asm_out_file); | |
| 1391 return true; | |
| 1392 | |
| 1393 case 4: | |
| 1394 if (GET_CODE (x) != CONST_INT) | |
| 1395 { | |
| 1396 aligned_p = 0; | |
| 1397 break; | |
| 1398 } | |
| 1399 fputs ("\tTETRA\t", asm_out_file); | |
| 1400 mmix_print_operand (asm_out_file, x, 'L'); | |
| 1401 fputc ('\n', asm_out_file); | |
| 1402 return true; | |
| 1403 | |
| 1404 case 8: | |
| 1405 /* We don't get here anymore for CONST_DOUBLE, because DImode | |
| 1406 isn't expressed as CONST_DOUBLE, and DFmode is handled | |
| 1407 elsewhere. */ | |
| 1408 gcc_assert (GET_CODE (x) != CONST_DOUBLE); | |
| 1409 assemble_integer_with_op ("\tOCTA\t", x); | |
| 1410 return true; | |
| 1411 } | |
| 1412 return default_assemble_integer (x, size, aligned_p); | |
| 1413 } | |
| 1414 | |
| 1415 /* ASM_OUTPUT_ASCII. */ | |
| 1416 | |
| 1417 void | |
| 1418 mmix_asm_output_ascii (FILE *stream, const char *string, int length) | |
| 1419 { | |
| 1420 while (length > 0) | |
| 1421 { | |
| 1422 int chunk_size = length > 60 ? 60 : length; | |
| 1423 fprintf (stream, "\tBYTE "); | |
| 1424 mmix_output_quoted_string (stream, string, chunk_size); | |
| 1425 string += chunk_size; | |
| 1426 length -= chunk_size; | |
| 1427 fprintf (stream, "\n"); | |
| 1428 } | |
| 1429 } | |
| 1430 | |
| 1431 /* ASM_OUTPUT_ALIGNED_COMMON. */ | |
| 1432 | |
| 1433 void | |
| 1434 mmix_asm_output_aligned_common (FILE *stream, | |
| 1435 const char *name, | |
| 1436 int size, | |
| 1437 int align) | |
| 1438 { | |
| 1439 /* This is mostly the elfos.h one. There doesn't seem to be a way to | |
| 1440 express this in a mmixal-compatible way. */ | |
| 1441 fprintf (stream, "\t.comm\t"); | |
| 1442 assemble_name (stream, name); | |
| 1443 fprintf (stream, ",%u,%u ! mmixal-incompatible COMMON\n", | |
| 1444 size, align / BITS_PER_UNIT); | |
| 1445 } | |
| 1446 | |
| 1447 /* ASM_OUTPUT_ALIGNED_LOCAL. */ | |
| 1448 | |
| 1449 void | |
| 1450 mmix_asm_output_aligned_local (FILE *stream, | |
| 1451 const char *name, | |
| 1452 int size, | |
| 1453 int align) | |
| 1454 { | |
| 1455 switch_to_section (data_section); | |
| 1456 | |
| 1457 ASM_OUTPUT_ALIGN (stream, exact_log2 (align/BITS_PER_UNIT)); | |
| 1458 assemble_name (stream, name); | |
| 1459 fprintf (stream, "\tLOC @+%d\n", size); | |
| 1460 } | |
| 1461 | |
| 1462 /* ASM_OUTPUT_LABEL. */ | |
| 1463 | |
| 1464 void | |
| 1465 mmix_asm_output_label (FILE *stream, const char *name) | |
| 1466 { | |
| 1467 assemble_name (stream, name); | |
| 1468 fprintf (stream, "\tIS @\n"); | |
| 1469 } | |
| 1470 | |
| 1471 /* ASM_OUTPUT_INTERNAL_LABEL. */ | |
| 1472 | |
| 1473 void | |
| 1474 mmix_asm_output_internal_label (FILE *stream, const char *name) | |
| 1475 { | |
| 1476 assemble_name_raw (stream, name); | |
| 1477 fprintf (stream, "\tIS @\n"); | |
| 1478 } | |
| 1479 | |
| 1480 /* ASM_DECLARE_REGISTER_GLOBAL. */ | |
| 1481 | |
| 1482 void | |
| 1483 mmix_asm_declare_register_global (FILE *stream ATTRIBUTE_UNUSED, | |
| 1484 tree decl ATTRIBUTE_UNUSED, | |
| 1485 int regno ATTRIBUTE_UNUSED, | |
| 1486 const char *name ATTRIBUTE_UNUSED) | |
| 1487 { | |
| 1488 /* Nothing to do here, but there *will* be, therefore the framework is | |
| 1489 here. */ | |
| 1490 } | |
| 1491 | |
| 1492 /* ASM_WEAKEN_LABEL. */ | |
| 1493 | |
| 1494 void | |
| 1495 mmix_asm_weaken_label (FILE *stream ATTRIBUTE_UNUSED, | |
| 1496 const char *name ATTRIBUTE_UNUSED) | |
| 1497 { | |
| 1498 fprintf (stream, "\t.weak "); | |
| 1499 assemble_name (stream, name); | |
| 1500 fprintf (stream, " ! mmixal-incompatible\n"); | |
| 1501 } | |
| 1502 | |
| 1503 /* MAKE_DECL_ONE_ONLY. */ | |
| 1504 | |
| 1505 void | |
| 1506 mmix_make_decl_one_only (tree decl) | |
| 1507 { | |
| 1508 DECL_WEAK (decl) = 1; | |
| 1509 } | |
| 1510 | |
| 1511 /* ASM_OUTPUT_LABELREF. | |
| 1512 Strip GCC's '*' and our own '@'. No order is assumed. */ | |
| 1513 | |
| 1514 void | |
| 1515 mmix_asm_output_labelref (FILE *stream, const char *name) | |
| 1516 { | |
| 1517 int is_extern = 1; | |
| 1518 | |
| 1519 for (; (*name == '@' || *name == '*'); name++) | |
| 1520 if (*name == '@') | |
| 1521 is_extern = 0; | |
| 1522 | |
| 1523 asm_fprintf (stream, "%s%U%s", | |
| 1524 is_extern && TARGET_TOPLEVEL_SYMBOLS ? ":" : "", | |
| 1525 name); | |
| 1526 } | |
| 1527 | |
| 1528 /* ASM_OUTPUT_DEF. */ | |
| 1529 | |
| 1530 void | |
| 1531 mmix_asm_output_def (FILE *stream, const char *name, const char *value) | |
| 1532 { | |
| 1533 assemble_name (stream, name); | |
| 1534 fprintf (stream, "\tIS "); | |
| 1535 assemble_name (stream, value); | |
| 1536 fputc ('\n', stream); | |
| 1537 } | |
| 1538 | |
| 111 | 1539 /* TARGET_PRINT_OPERAND. */ |
| 1540 | |
| 1541 static void | |
| 0 | 1542 mmix_print_operand (FILE *stream, rtx x, int code) |
| 1543 { | |
| 1544 /* When we add support for different codes later, we can, when needed, | |
| 1545 drop through to the main handler with a modified operand. */ | |
| 1546 rtx modified_x = x; | |
| 1547 int regno = x != NULL_RTX && REG_P (x) ? REGNO (x) : 0; | |
| 1548 | |
| 1549 switch (code) | |
| 1550 { | |
| 1551 /* Unrelated codes are in alphabetic order. */ | |
| 1552 | |
| 1553 case '+': | |
| 1554 /* For conditional branches, output "P" for a probable branch. */ | |
| 1555 if (TARGET_BRANCH_PREDICT) | |
| 1556 { | |
| 1557 x = find_reg_note (current_output_insn, REG_BR_PROB, 0); | |
| 111 | 1558 if (x && profile_probability::from_reg_br_prob_note (XINT (x, 0)) |
| 1559 > profile_probability::even ()) | |
| 0 | 1560 putc ('P', stream); |
| 1561 } | |
| 1562 return; | |
| 1563 | |
| 1564 case '.': | |
| 1565 /* For the %d in POP %d,0. */ | |
| 1566 fprintf (stream, "%d", MMIX_POP_ARGUMENT ()); | |
| 1567 return; | |
| 1568 | |
| 1569 case 'B': | |
| 1570 if (GET_CODE (x) != CONST_INT) | |
| 1571 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
| 1572 fprintf (stream, "%d", (int) (INTVAL (x) & 0xff)); | |
| 1573 return; | |
| 1574 | |
| 1575 case 'H': | |
| 1576 /* Highpart. Must be general register, and not the last one, as | |
| 1577 that one cannot be part of a consecutive register pair. */ | |
| 1578 if (regno > MMIX_LAST_GENERAL_REGISTER - 1) | |
| 1579 internal_error ("MMIX Internal: Bad register: %d", regno); | |
| 1580 | |
| 1581 /* This is big-endian, so the high-part is the first one. */ | |
| 1582 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
| 1583 return; | |
| 1584 | |
| 1585 case 'L': | |
| 1586 /* Lowpart. Must be CONST_INT or general register, and not the last | |
| 1587 one, as that one cannot be part of a consecutive register pair. */ | |
| 1588 if (GET_CODE (x) == CONST_INT) | |
| 1589 { | |
| 1590 fprintf (stream, "#%lx", | |
| 1591 (unsigned long) (INTVAL (x) | |
| 1592 & ((unsigned int) 0x7fffffff * 2 + 1))); | |
| 1593 return; | |
| 1594 } | |
| 1595 | |
| 1596 if (GET_CODE (x) == SYMBOL_REF) | |
| 1597 { | |
| 1598 output_addr_const (stream, x); | |
| 1599 return; | |
| 1600 } | |
| 1601 | |
| 1602 if (regno > MMIX_LAST_GENERAL_REGISTER - 1) | |
| 1603 internal_error ("MMIX Internal: Bad register: %d", regno); | |
| 1604 | |
| 1605 /* This is big-endian, so the low-part is + 1. */ | |
| 1606 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno) + 1]); | |
| 1607 return; | |
| 1608 | |
| 1609 /* Can't use 'a' because that's a generic modifier for address | |
| 1610 output. */ | |
| 1611 case 'A': | |
| 1612 mmix_output_shiftvalue_op_from_str (stream, "ANDN", | |
| 111 | 1613 ~(uint64_t) |
| 0 | 1614 mmix_intval (x)); |
| 1615 return; | |
| 1616 | |
| 1617 case 'i': | |
| 1618 mmix_output_shiftvalue_op_from_str (stream, "INC", | |
| 111 | 1619 (uint64_t) |
| 0 | 1620 mmix_intval (x)); |
| 1621 return; | |
| 1622 | |
| 1623 case 'o': | |
| 1624 mmix_output_shiftvalue_op_from_str (stream, "OR", | |
| 111 | 1625 (uint64_t) |
| 0 | 1626 mmix_intval (x)); |
| 1627 return; | |
| 1628 | |
| 1629 case 's': | |
| 1630 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 111 | 1631 (uint64_t) |
| 0 | 1632 mmix_intval (x)); |
| 1633 return; | |
| 1634 | |
| 1635 case 'd': | |
| 1636 case 'D': | |
| 1637 mmix_output_condition (stream, x, (code == 'D')); | |
| 1638 return; | |
| 1639 | |
| 1640 case 'e': | |
| 1641 /* Output an extra "e" to make fcmpe, fune. */ | |
| 1642 if (TARGET_FCMP_EPSILON) | |
| 1643 fprintf (stream, "e"); | |
| 1644 return; | |
| 1645 | |
| 1646 case 'm': | |
| 1647 /* Output the number minus 1. */ | |
| 1648 if (GET_CODE (x) != CONST_INT) | |
| 1649 { | |
| 1650 fatal_insn ("MMIX Internal: Bad value for 'm', not a CONST_INT", | |
| 1651 x); | |
| 1652 } | |
| 111 | 1653 fprintf (stream, "%" PRId64, |
| 1654 (int64_t) (mmix_intval (x) - 1)); | |
| 0 | 1655 return; |
| 1656 | |
| 1657 case 'p': | |
| 1658 /* Store the number of registers we want to save. This was setup | |
| 1659 by the prologue. The actual operand contains the number of | |
| 1660 registers to pass, but we don't use it currently. Anyway, we | |
| 1661 need to output the number of saved registers here. */ | |
| 1662 fprintf (stream, "%d", | |
| 1663 cfun->machine->highest_saved_stack_register + 1); | |
| 1664 return; | |
| 1665 | |
| 1666 case 'r': | |
| 1667 /* Store the register to output a constant to. */ | |
| 1668 if (! REG_P (x)) | |
| 1669 fatal_insn ("MMIX Internal: Expected a register, not this", x); | |
| 1670 mmix_output_destination_register = MMIX_OUTPUT_REGNO (regno); | |
| 1671 return; | |
| 1672 | |
| 1673 case 'I': | |
| 1674 /* Output the constant. Note that we use this for floats as well. */ | |
| 1675 if (GET_CODE (x) != CONST_INT | |
| 1676 && (GET_CODE (x) != CONST_DOUBLE | |
| 1677 || (GET_MODE (x) != VOIDmode && GET_MODE (x) != DFmode | |
| 1678 && GET_MODE (x) != SFmode))) | |
| 1679 fatal_insn ("MMIX Internal: Expected a constant, not this", x); | |
| 1680 mmix_output_register_setting (stream, | |
| 1681 mmix_output_destination_register, | |
| 1682 mmix_intval (x), 0); | |
| 1683 return; | |
| 1684 | |
| 1685 case 'U': | |
| 1686 /* An U for unsigned, if TARGET_ZERO_EXTEND. Ignore the operand. */ | |
| 1687 if (TARGET_ZERO_EXTEND) | |
| 1688 putc ('U', stream); | |
| 1689 return; | |
| 1690 | |
| 1691 case 'v': | |
| 111 | 1692 mmix_output_shifted_value (stream, (int64_t) mmix_intval (x)); |
| 0 | 1693 return; |
| 1694 | |
| 1695 case 'V': | |
| 111 | 1696 mmix_output_shifted_value (stream, (int64_t) ~mmix_intval (x)); |
| 0 | 1697 return; |
| 1698 | |
| 1699 case 'W': | |
| 1700 if (GET_CODE (x) != CONST_INT) | |
| 1701 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
| 1702 fprintf (stream, "#%x", (int) (INTVAL (x) & 0xffff)); | |
| 1703 return; | |
| 1704 | |
| 1705 case 0: | |
| 1706 /* Nothing to do. */ | |
| 1707 break; | |
| 1708 | |
| 1709 default: | |
| 1710 /* Presumably there's a missing case above if we get here. */ | |
| 1711 internal_error ("MMIX Internal: Missing %qc case in mmix_print_operand", code); | |
| 1712 } | |
| 1713 | |
| 1714 switch (GET_CODE (modified_x)) | |
| 1715 { | |
| 1716 case REG: | |
| 1717 regno = REGNO (modified_x); | |
| 1718 if (regno >= FIRST_PSEUDO_REGISTER) | |
| 1719 internal_error ("MMIX Internal: Bad register: %d", regno); | |
| 1720 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
| 1721 return; | |
| 1722 | |
| 1723 case MEM: | |
| 111 | 1724 output_address (GET_MODE (modified_x), XEXP (modified_x, 0)); |
| 0 | 1725 return; |
| 1726 | |
| 1727 case CONST_INT: | |
| 1728 /* For -2147483648, mmixal complains that the constant does not fit | |
| 1729 in 4 bytes, so let's output it as hex. Take care to handle hosts | |
| 1730 where HOST_WIDE_INT is longer than an int. | |
| 1731 | |
| 1732 Print small constants +-255 using decimal. */ | |
| 1733 | |
| 1734 if (INTVAL (modified_x) > -256 && INTVAL (modified_x) < 256) | |
| 1735 fprintf (stream, "%d", (int) (INTVAL (modified_x))); | |
| 1736 else | |
| 1737 fprintf (stream, "#%x", | |
| 1738 (int) (INTVAL (modified_x)) & (unsigned int) ~0); | |
| 1739 return; | |
| 1740 | |
| 1741 case CONST_DOUBLE: | |
| 1742 /* Do somewhat as CONST_INT. */ | |
| 1743 mmix_output_octa (stream, mmix_intval (modified_x), 0); | |
| 1744 return; | |
| 1745 | |
| 1746 case CONST: | |
| 1747 output_addr_const (stream, modified_x); | |
| 1748 return; | |
| 1749 | |
| 1750 default: | |
| 1751 /* No need to test for all strange things. Let output_addr_const do | |
| 1752 it for us. */ | |
| 1753 if (CONSTANT_P (modified_x) | |
| 1754 /* Strangely enough, this is not included in CONSTANT_P. | |
| 1755 FIXME: Ask/check about sanity here. */ | |
| 111 | 1756 || LABEL_P (modified_x)) |
| 0 | 1757 { |
| 1758 output_addr_const (stream, modified_x); | |
| 1759 return; | |
| 1760 } | |
| 1761 | |
| 1762 /* We need the original here. */ | |
| 1763 fatal_insn ("MMIX Internal: Cannot decode this operand", x); | |
| 1764 } | |
| 1765 } | |
| 1766 | |
| 111 | 1767 /* TARGET_PRINT_OPERAND_PUNCT_VALID_P. */ |
| 1768 | |
| 1769 static bool | |
| 1770 mmix_print_operand_punct_valid_p (unsigned char code) | |
| 0 | 1771 { |
| 1772 /* A '+' is used for branch prediction, similar to other ports. */ | |
| 1773 return code == '+' | |
| 1774 /* A '.' is used for the %d in the POP %d,0 return insn. */ | |
| 1775 || code == '.'; | |
| 1776 } | |
| 1777 | |
| 111 | 1778 /* TARGET_PRINT_OPERAND_ADDRESS. */ |
| 1779 | |
| 1780 static void | |
| 1781 mmix_print_operand_address (FILE *stream, machine_mode /*mode*/, rtx x) | |
| 0 | 1782 { |
| 1783 if (REG_P (x)) | |
| 1784 { | |
| 1785 /* I find the generated assembly code harder to read without | |
| 1786 the ",0". */ | |
| 1787 fprintf (stream, "%s,0", reg_names[MMIX_OUTPUT_REGNO (REGNO (x))]); | |
| 1788 return; | |
| 1789 } | |
| 1790 else if (GET_CODE (x) == PLUS) | |
| 1791 { | |
| 1792 rtx x1 = XEXP (x, 0); | |
| 1793 rtx x2 = XEXP (x, 1); | |
| 1794 | |
| 1795 if (REG_P (x1)) | |
| 1796 { | |
| 1797 fprintf (stream, "%s,", reg_names[MMIX_OUTPUT_REGNO (REGNO (x1))]); | |
| 1798 | |
| 1799 if (REG_P (x2)) | |
| 1800 { | |
| 1801 fprintf (stream, "%s", | |
| 1802 reg_names[MMIX_OUTPUT_REGNO (REGNO (x2))]); | |
| 1803 return; | |
| 1804 } | |
| 111 | 1805 else if (satisfies_constraint_I (x2)) |
| 0 | 1806 { |
| 1807 output_addr_const (stream, x2); | |
| 1808 return; | |
| 1809 } | |
| 1810 } | |
| 1811 } | |
| 1812 | |
| 111 | 1813 if (TARGET_BASE_ADDRESSES && mmix_legitimate_constant_p (Pmode, x)) |
| 0 | 1814 { |
| 1815 output_addr_const (stream, x); | |
| 1816 return; | |
| 1817 } | |
| 1818 | |
| 1819 fatal_insn ("MMIX Internal: This is not a recognized address", x); | |
| 1820 } | |
| 1821 | |
| 1822 /* ASM_OUTPUT_REG_PUSH. */ | |
| 1823 | |
| 1824 void | |
| 1825 mmix_asm_output_reg_push (FILE *stream, int regno) | |
| 1826 { | |
| 1827 fprintf (stream, "\tSUBU %s,%s,8\n\tSTOU %s,%s,0\n", | |
| 1828 reg_names[MMIX_STACK_POINTER_REGNUM], | |
| 1829 reg_names[MMIX_STACK_POINTER_REGNUM], | |
| 1830 reg_names[MMIX_OUTPUT_REGNO (regno)], | |
| 1831 reg_names[MMIX_STACK_POINTER_REGNUM]); | |
| 1832 } | |
| 1833 | |
| 1834 /* ASM_OUTPUT_REG_POP. */ | |
| 1835 | |
| 1836 void | |
| 1837 mmix_asm_output_reg_pop (FILE *stream, int regno) | |
| 1838 { | |
| 1839 fprintf (stream, "\tLDOU %s,%s,0\n\tINCL %s,8\n", | |
| 1840 reg_names[MMIX_OUTPUT_REGNO (regno)], | |
| 1841 reg_names[MMIX_STACK_POINTER_REGNUM], | |
| 1842 reg_names[MMIX_STACK_POINTER_REGNUM]); | |
| 1843 } | |
| 1844 | |
| 1845 /* ASM_OUTPUT_ADDR_DIFF_ELT. */ | |
| 1846 | |
| 1847 void | |
| 1848 mmix_asm_output_addr_diff_elt (FILE *stream, | |
| 1849 rtx body ATTRIBUTE_UNUSED, | |
| 1850 int value, | |
| 1851 int rel) | |
| 1852 { | |
| 1853 fprintf (stream, "\tTETRA L%d-L%d\n", value, rel); | |
| 1854 } | |
| 1855 | |
| 1856 /* ASM_OUTPUT_ADDR_VEC_ELT. */ | |
| 1857 | |
| 1858 void | |
| 1859 mmix_asm_output_addr_vec_elt (FILE *stream, int value) | |
| 1860 { | |
| 1861 fprintf (stream, "\tOCTA L:%d\n", value); | |
| 1862 } | |
| 1863 | |
| 1864 /* ASM_OUTPUT_SKIP. */ | |
| 1865 | |
| 1866 void | |
| 1867 mmix_asm_output_skip (FILE *stream, int nbytes) | |
| 1868 { | |
| 1869 fprintf (stream, "\tLOC @+%d\n", nbytes); | |
| 1870 } | |
| 1871 | |
| 1872 /* ASM_OUTPUT_ALIGN. */ | |
| 1873 | |
| 1874 void | |
| 1875 mmix_asm_output_align (FILE *stream, int power) | |
| 1876 { | |
| 1877 /* We need to record the needed alignment of this section in the object, | |
| 1878 so we have to output an alignment directive. Use a .p2align (not | |
| 1879 .align) so people will never have to wonder about whether the | |
| 1880 argument is in number of bytes or the log2 thereof. We do it in | |
| 1881 addition to the LOC directive, so nothing needs tweaking when | |
| 1882 copy-pasting assembly into mmixal. */ | |
| 1883 fprintf (stream, "\t.p2align %d\n", power); | |
| 1884 fprintf (stream, "\tLOC @+(%d-@)&%d\n", 1 << power, (1 << power) - 1); | |
| 1885 } | |
| 1886 | |
| 1887 /* DBX_REGISTER_NUMBER. */ | |
| 1888 | |
|
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
|
1889 unsigned |
|
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
|
1890 mmix_dbx_register_number (unsigned regno) |
| 0 | 1891 { |
| 1892 /* Adjust the register number to the one it will be output as, dammit. | |
| 1893 It'd be nice if we could check the assumption that we're filling a | |
| 1894 gap, but every register between the last saved register and parameter | |
| 1895 registers might be a valid parameter register. */ | |
| 1896 regno = MMIX_OUTPUT_REGNO (regno); | |
| 1897 | |
| 1898 /* We need to renumber registers to get the number of the return address | |
| 1899 register in the range 0..255. It is also space-saving if registers | |
| 1900 mentioned in the call-frame information (which uses this function by | |
| 1901 defaulting DWARF_FRAME_REGNUM to DBX_REGISTER_NUMBER) are numbered | |
| 1902 0 .. 63. So map 224 .. 256+15 -> 0 .. 47 and 0 .. 223 -> 48..223+48. */ | |
| 1903 return regno >= 224 ? (regno - 224) : (regno + 48); | |
| 1904 } | |
| 1905 | |
| 1906 /* End of target macro support functions. | |
| 1907 | |
| 1908 Now the MMIX port's own functions. First the exported ones. */ | |
| 1909 | |
| 1910 /* Wrapper for get_hard_reg_initial_val since integrate.h isn't included | |
| 1911 from insn-emit.c. */ | |
| 1912 | |
| 1913 rtx | |
| 111 | 1914 mmix_get_hard_reg_initial_val (machine_mode mode, int regno) |
| 0 | 1915 { |
| 1916 return get_hard_reg_initial_val (mode, regno); | |
| 1917 } | |
| 1918 | |
| 1919 /* Nonzero when the function epilogue is simple enough that a single | |
| 1920 "POP %d,0" should be used even within the function. */ | |
| 1921 | |
| 1922 int | |
| 1923 mmix_use_simple_return (void) | |
| 1924 { | |
| 1925 int regno; | |
| 1926 | |
| 1927 int stack_space_to_allocate | |
| 1928 = (crtl->outgoing_args_size | |
| 1929 + crtl->args.pretend_args_size | |
| 1930 + get_frame_size () + 7) & ~7; | |
| 1931 | |
| 1932 if (!TARGET_USE_RETURN_INSN || !reload_completed) | |
| 1933 return 0; | |
| 1934 | |
| 1935 for (regno = 255; | |
| 1936 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 1937 regno--) | |
| 1938 /* Note that we assume that the frame-pointer-register is one of these | |
| 1939 registers, in which case we don't count it here. */ | |
| 1940 if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 1941 && df_regs_ever_live_p (regno) && !call_used_regs[regno])) | |
| 1942 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 1943 return 0; | |
| 1944 | |
| 1945 if (frame_pointer_needed) | |
| 1946 stack_space_to_allocate += 8; | |
| 1947 | |
| 1948 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 1949 stack_space_to_allocate += 16; | |
| 1950 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 1951 stack_space_to_allocate += 8; | |
| 1952 | |
| 1953 return stack_space_to_allocate == 0; | |
| 1954 } | |
| 1955 | |
| 1956 | |
| 1957 /* Expands the function prologue into RTX. */ | |
| 1958 | |
| 1959 void | |
| 1960 mmix_expand_prologue (void) | |
| 1961 { | |
| 1962 HOST_WIDE_INT locals_size = get_frame_size (); | |
| 1963 int regno; | |
| 1964 HOST_WIDE_INT stack_space_to_allocate | |
| 1965 = (crtl->outgoing_args_size | |
| 1966 + crtl->args.pretend_args_size | |
| 1967 + locals_size + 7) & ~7; | |
| 1968 HOST_WIDE_INT offset = -8; | |
| 1969 | |
| 1970 /* Add room needed to save global non-register-stack registers. */ | |
| 1971 for (regno = 255; | |
| 1972 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 1973 regno--) | |
| 1974 /* Note that we assume that the frame-pointer-register is one of these | |
| 1975 registers, in which case we don't count it here. */ | |
| 1976 if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 1977 && df_regs_ever_live_p (regno) && !call_used_regs[regno])) | |
| 1978 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 1979 stack_space_to_allocate += 8; | |
| 1980 | |
| 1981 /* If we do have a frame-pointer, add room for it. */ | |
| 1982 if (frame_pointer_needed) | |
| 1983 stack_space_to_allocate += 8; | |
| 1984 | |
| 1985 /* If we have a non-local label, we need to be able to unwind to it, so | |
| 1986 store the current register stack pointer. Also store the return | |
| 1987 address if we do that. */ | |
| 1988 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 1989 stack_space_to_allocate += 16; | |
| 1990 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 1991 /* If we do have a saved return-address slot, add room for it. */ | |
| 1992 stack_space_to_allocate += 8; | |
| 1993 | |
| 1994 /* Make sure we don't get an unaligned stack. */ | |
| 1995 if ((stack_space_to_allocate % 8) != 0) | |
| 1996 internal_error ("stack frame not a multiple of 8 bytes: %wd", | |
| 1997 stack_space_to_allocate); | |
| 1998 | |
| 1999 if (crtl->args.pretend_args_size) | |
| 2000 { | |
| 2001 int mmix_first_vararg_reg | |
| 2002 = (MMIX_FIRST_INCOMING_ARG_REGNUM | |
| 2003 + (MMIX_MAX_ARGS_IN_REGS | |
| 2004 - crtl->args.pretend_args_size / 8)); | |
| 2005 | |
| 2006 for (regno | |
| 2007 = MMIX_FIRST_INCOMING_ARG_REGNUM + MMIX_MAX_ARGS_IN_REGS - 1; | |
| 2008 regno >= mmix_first_vararg_reg; | |
| 2009 regno--) | |
| 2010 { | |
| 2011 if (offset < 0) | |
| 2012 { | |
| 2013 HOST_WIDE_INT stack_chunk | |
| 2014 = stack_space_to_allocate > (256 - 8) | |
| 2015 ? (256 - 8) : stack_space_to_allocate; | |
| 2016 | |
| 2017 mmix_emit_sp_add (-stack_chunk); | |
| 2018 offset += stack_chunk; | |
| 2019 stack_space_to_allocate -= stack_chunk; | |
| 2020 } | |
| 2021 | |
| 2022 /* These registers aren't actually saved (as in "will be | |
| 2023 restored"), so don't tell DWARF2 they're saved. */ | |
| 2024 emit_move_insn (gen_rtx_MEM (DImode, | |
| 111 | 2025 plus_constant (Pmode, stack_pointer_rtx, |
| 0 | 2026 offset)), |
| 2027 gen_rtx_REG (DImode, regno)); | |
| 2028 offset -= 8; | |
| 2029 } | |
| 2030 } | |
| 2031 | |
| 2032 /* Store the frame-pointer. */ | |
| 2033 | |
| 2034 if (frame_pointer_needed) | |
| 2035 { | |
| 2036 rtx insn; | |
| 2037 | |
| 2038 if (offset < 0) | |
| 2039 { | |
| 2040 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
| 2041 HOST_WIDE_INT stack_chunk | |
| 2042 = stack_space_to_allocate > (256 - 8 - 8) | |
| 2043 ? (256 - 8 - 8) : stack_space_to_allocate; | |
| 2044 | |
| 2045 mmix_emit_sp_add (-stack_chunk); | |
| 2046 | |
| 2047 offset += stack_chunk; | |
| 2048 stack_space_to_allocate -= stack_chunk; | |
| 2049 } | |
| 2050 | |
| 2051 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
| 111 | 2052 plus_constant (Pmode, |
| 2053 stack_pointer_rtx, | |
| 0 | 2054 offset)), |
| 2055 hard_frame_pointer_rtx); | |
| 2056 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2057 insn = emit_insn (gen_adddi3 (hard_frame_pointer_rtx, | |
| 2058 stack_pointer_rtx, | |
| 2059 GEN_INT (offset + 8))); | |
| 2060 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2061 offset -= 8; | |
| 2062 } | |
| 2063 | |
| 2064 if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2065 { | |
| 2066 rtx tmpreg, retreg; | |
| 2067 rtx insn; | |
| 2068 | |
| 2069 /* Store the return-address, if one is needed on the stack. We | |
| 2070 usually store it in a register when needed, but that doesn't work | |
| 2071 with -fexceptions. */ | |
| 2072 | |
| 2073 if (offset < 0) | |
| 2074 { | |
| 2075 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
| 2076 HOST_WIDE_INT stack_chunk | |
| 2077 = stack_space_to_allocate > (256 - 8 - 8) | |
| 2078 ? (256 - 8 - 8) : stack_space_to_allocate; | |
| 2079 | |
| 2080 mmix_emit_sp_add (-stack_chunk); | |
| 2081 | |
| 2082 offset += stack_chunk; | |
| 2083 stack_space_to_allocate -= stack_chunk; | |
| 2084 } | |
| 2085 | |
| 2086 tmpreg = gen_rtx_REG (DImode, 255); | |
| 2087 retreg = gen_rtx_REG (DImode, MMIX_rJ_REGNUM); | |
| 2088 | |
| 2089 /* Dwarf2 code is confused by the use of a temporary register for | |
| 2090 storing the return address, so we have to express it as a note, | |
| 2091 which we attach to the actual store insn. */ | |
| 2092 emit_move_insn (tmpreg, retreg); | |
| 2093 | |
| 2094 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
| 111 | 2095 plus_constant (Pmode, |
| 2096 stack_pointer_rtx, | |
| 0 | 2097 offset)), |
| 2098 tmpreg); | |
| 2099 RTX_FRAME_RELATED_P (insn) = 1; | |
|
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
|
2100 add_reg_note (insn, REG_FRAME_RELATED_EXPR, |
| 111 | 2101 gen_rtx_SET (gen_rtx_MEM (DImode, |
| 2102 plus_constant (Pmode, | |
| 2103 stack_pointer_rtx, | |
|
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
|
2104 offset)), |
|
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
|
2105 retreg)); |
| 0 | 2106 |
| 2107 offset -= 8; | |
| 2108 } | |
| 2109 else if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2110 offset -= 8; | |
| 2111 | |
| 2112 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2113 { | |
| 2114 /* Store the register defining the numbering of local registers, so | |
| 2115 we know how long to unwind the register stack. */ | |
| 2116 | |
| 2117 if (offset < 0) | |
| 2118 { | |
| 2119 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
| 2120 HOST_WIDE_INT stack_chunk | |
| 2121 = stack_space_to_allocate > (256 - 8 - 8) | |
| 2122 ? (256 - 8 - 8) : stack_space_to_allocate; | |
| 2123 | |
| 2124 mmix_emit_sp_add (-stack_chunk); | |
| 2125 | |
| 2126 offset += stack_chunk; | |
| 2127 stack_space_to_allocate -= stack_chunk; | |
| 2128 } | |
| 2129 | |
| 2130 /* We don't tell dwarf2 about this one; we just have it to unwind | |
| 2131 the register stack at landing pads. FIXME: It's a kludge because | |
| 2132 we can't describe the effect of the PUSHJ and PUSHGO insns on the | |
| 2133 register stack at the moment. Best thing would be to handle it | |
| 2134 like stack-pointer offsets. Better: some hook into dwarf2out.c | |
| 2135 to produce DW_CFA_expression:s that specify the increment of rO, | |
| 2136 and unwind it at eh_return (preferred) or at the landing pad. | |
| 2137 Then saves to $0..$G-1 could be specified through that register. */ | |
| 2138 | |
| 2139 emit_move_insn (gen_rtx_REG (DImode, 255), | |
| 2140 gen_rtx_REG (DImode, | |
| 2141 MMIX_rO_REGNUM)); | |
| 2142 emit_move_insn (gen_rtx_MEM (DImode, | |
| 111 | 2143 plus_constant (Pmode, stack_pointer_rtx, |
| 2144 offset)), | |
| 0 | 2145 gen_rtx_REG (DImode, 255)); |
| 2146 offset -= 8; | |
| 2147 } | |
| 2148 | |
| 2149 /* After the return-address and the frame-pointer, we have the local | |
| 2150 variables. They're the ones that may have an "unaligned" size. */ | |
| 2151 offset -= (locals_size + 7) & ~7; | |
| 2152 | |
| 2153 /* Now store all registers that are global, i.e. not saved by the | |
| 2154 register file machinery. | |
| 2155 | |
| 2156 It is assumed that the frame-pointer is one of these registers, so it | |
| 2157 is explicitly excluded in the count. */ | |
| 2158 | |
| 2159 for (regno = 255; | |
| 2160 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 2161 regno--) | |
| 2162 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 2163 && df_regs_ever_live_p (regno) && ! call_used_regs[regno]) | |
| 2164 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 2165 { | |
| 2166 rtx insn; | |
| 2167 | |
| 2168 if (offset < 0) | |
| 2169 { | |
| 2170 HOST_WIDE_INT stack_chunk | |
| 2171 = (stack_space_to_allocate > (256 - offset - 8) | |
| 2172 ? (256 - offset - 8) : stack_space_to_allocate); | |
| 2173 | |
| 2174 mmix_emit_sp_add (-stack_chunk); | |
| 2175 offset += stack_chunk; | |
| 2176 stack_space_to_allocate -= stack_chunk; | |
| 2177 } | |
| 2178 | |
| 2179 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
| 111 | 2180 plus_constant (Pmode, |
| 2181 stack_pointer_rtx, | |
| 0 | 2182 offset)), |
| 2183 gen_rtx_REG (DImode, regno)); | |
| 2184 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2185 offset -= 8; | |
| 2186 } | |
| 2187 | |
| 2188 /* Finally, allocate room for outgoing args and local vars if room | |
| 2189 wasn't allocated above. */ | |
| 2190 if (stack_space_to_allocate) | |
| 2191 mmix_emit_sp_add (-stack_space_to_allocate); | |
| 2192 } | |
| 2193 | |
| 2194 /* Expands the function epilogue into RTX. */ | |
| 2195 | |
| 2196 void | |
| 2197 mmix_expand_epilogue (void) | |
| 2198 { | |
| 2199 HOST_WIDE_INT locals_size = get_frame_size (); | |
| 2200 int regno; | |
| 2201 HOST_WIDE_INT stack_space_to_deallocate | |
| 2202 = (crtl->outgoing_args_size | |
| 2203 + crtl->args.pretend_args_size | |
| 2204 + locals_size + 7) & ~7; | |
| 2205 | |
| 2206 /* The first address to access is beyond the outgoing_args area. */ | |
| 2207 HOST_WIDE_INT offset = crtl->outgoing_args_size; | |
| 2208 | |
| 2209 /* Add the space for global non-register-stack registers. | |
| 2210 It is assumed that the frame-pointer register can be one of these | |
| 2211 registers, in which case it is excluded from the count when needed. */ | |
| 2212 for (regno = 255; | |
| 2213 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
| 2214 regno--) | |
| 2215 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 2216 && df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
| 2217 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 2218 stack_space_to_deallocate += 8; | |
| 2219 | |
| 2220 /* Add in the space for register stack-pointer. If so, always add room | |
| 2221 for the saved PC. */ | |
| 2222 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2223 stack_space_to_deallocate += 16; | |
| 2224 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2225 /* If we have a saved return-address slot, add it in. */ | |
| 2226 stack_space_to_deallocate += 8; | |
| 2227 | |
| 2228 /* Add in the frame-pointer. */ | |
| 2229 if (frame_pointer_needed) | |
| 2230 stack_space_to_deallocate += 8; | |
| 2231 | |
| 2232 /* Make sure we don't get an unaligned stack. */ | |
| 2233 if ((stack_space_to_deallocate % 8) != 0) | |
| 2234 internal_error ("stack frame not a multiple of octabyte: %wd", | |
| 2235 stack_space_to_deallocate); | |
| 2236 | |
| 2237 /* We will add back small offsets to the stack pointer as we go. | |
| 2238 First, we restore all registers that are global, i.e. not saved by | |
| 2239 the register file machinery. */ | |
| 2240 | |
| 2241 for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
| 2242 regno <= 255; | |
| 2243 regno++) | |
| 2244 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
| 2245 && df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
| 2246 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
| 2247 { | |
| 2248 if (offset > 255) | |
| 2249 { | |
| 2250 mmix_emit_sp_add (offset); | |
| 2251 stack_space_to_deallocate -= offset; | |
| 2252 offset = 0; | |
| 2253 } | |
| 2254 | |
| 2255 emit_move_insn (gen_rtx_REG (DImode, regno), | |
| 2256 gen_rtx_MEM (DImode, | |
| 111 | 2257 plus_constant (Pmode, stack_pointer_rtx, |
| 0 | 2258 offset))); |
| 2259 offset += 8; | |
| 2260 } | |
| 2261 | |
| 2262 /* Here is where the local variables were. As in the prologue, they | |
| 2263 might be of an unaligned size. */ | |
| 2264 offset += (locals_size + 7) & ~7; | |
| 2265 | |
| 2266 /* The saved register stack pointer is just below the frame-pointer | |
| 2267 register. We don't need to restore it "manually"; the POP | |
| 2268 instruction does that. */ | |
| 2269 if (MMIX_CFUN_HAS_LANDING_PAD) | |
| 2270 offset += 16; | |
| 2271 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
| 2272 /* The return-address slot is just below the frame-pointer register. | |
| 2273 We don't need to restore it because we don't really use it. */ | |
| 2274 offset += 8; | |
| 2275 | |
| 2276 /* Get back the old frame-pointer-value. */ | |
| 2277 if (frame_pointer_needed) | |
| 2278 { | |
| 2279 if (offset > 255) | |
| 2280 { | |
| 2281 mmix_emit_sp_add (offset); | |
| 2282 | |
| 2283 stack_space_to_deallocate -= offset; | |
| 2284 offset = 0; | |
| 2285 } | |
| 2286 | |
| 2287 emit_move_insn (hard_frame_pointer_rtx, | |
| 2288 gen_rtx_MEM (DImode, | |
| 111 | 2289 plus_constant (Pmode, stack_pointer_rtx, |
| 0 | 2290 offset))); |
| 2291 offset += 8; | |
| 2292 } | |
| 2293 | |
| 2294 /* We do not need to restore pretended incoming args, just add back | |
| 2295 offset to sp. */ | |
| 2296 if (stack_space_to_deallocate != 0) | |
| 2297 mmix_emit_sp_add (stack_space_to_deallocate); | |
| 2298 | |
| 2299 if (crtl->calls_eh_return) | |
| 2300 /* Adjust the (normal) stack-pointer to that of the receiver. | |
| 2301 FIXME: It would be nice if we could also adjust the register stack | |
| 2302 here, but we need to express it through DWARF 2 too. */ | |
| 2303 emit_insn (gen_adddi3 (stack_pointer_rtx, stack_pointer_rtx, | |
| 2304 gen_rtx_REG (DImode, | |
| 2305 MMIX_EH_RETURN_STACKADJ_REGNUM))); | |
| 2306 } | |
| 2307 | |
| 2308 /* Output an optimal sequence for setting a register to a specific | |
| 2309 constant. Used in an alternative for const_ints in movdi, and when | |
| 2310 using large stack-frame offsets. | |
| 2311 | |
| 2312 Use do_begin_end to say if a line-starting TAB and newline before the | |
| 2313 first insn and after the last insn is wanted. */ | |
| 2314 | |
| 2315 void | |
| 2316 mmix_output_register_setting (FILE *stream, | |
| 2317 int regno, | |
| 111 | 2318 int64_t value, |
| 0 | 2319 int do_begin_end) |
| 2320 { | |
| 2321 if (do_begin_end) | |
| 2322 fprintf (stream, "\t"); | |
| 2323 | |
| 111 | 2324 if (insn_const_int_ok_for_constraint (value, CONSTRAINT_K)) |
| 2325 fprintf (stream, "NEGU %s,0,%" PRId64, reg_names[regno], -value); | |
| 2326 else if (mmix_shiftable_wyde_value ((uint64_t) value)) | |
| 0 | 2327 { |
| 2328 /* First, the one-insn cases. */ | |
| 2329 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 111 | 2330 (uint64_t) |
| 0 | 2331 value); |
| 2332 fprintf (stream, " %s,", reg_names[regno]); | |
| 111 | 2333 mmix_output_shifted_value (stream, (uint64_t) value); |
| 0 | 2334 } |
| 111 | 2335 else if (mmix_shiftable_wyde_value (-(uint64_t) value)) |
| 0 | 2336 { |
| 2337 /* We do this to get a bit more legible assembly code. The next | |
| 2338 alternative is mostly redundant with this. */ | |
| 2339 | |
| 2340 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 111 | 2341 -(uint64_t) |
| 0 | 2342 value); |
| 2343 fprintf (stream, " %s,", reg_names[regno]); | |
| 111 | 2344 mmix_output_shifted_value (stream, -(uint64_t) value); |
| 0 | 2345 fprintf (stream, "\n\tNEGU %s,0,%s", reg_names[regno], |
| 2346 reg_names[regno]); | |
| 2347 } | |
| 111 | 2348 else if (mmix_shiftable_wyde_value (~(uint64_t) value)) |
| 0 | 2349 { |
| 2350 /* Slightly more expensive, the two-insn cases. */ | |
| 2351 | |
| 2352 /* FIXME: We could of course also test if 0..255-N or ~(N | 1..255) | |
| 2353 is shiftable, or any other one-insn transformation of the value. | |
| 2354 FIXME: Check first if the value is "shiftable" by two loading | |
| 2355 with two insns, since it makes more readable assembly code (if | |
| 2356 anyone else cares). */ | |
| 2357 | |
| 2358 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
| 111 | 2359 ~(uint64_t) |
| 0 | 2360 value); |
| 2361 fprintf (stream, " %s,", reg_names[regno]); | |
| 111 | 2362 mmix_output_shifted_value (stream, ~(uint64_t) value); |
| 0 | 2363 fprintf (stream, "\n\tNOR %s,%s,0", reg_names[regno], |
| 2364 reg_names[regno]); | |
| 2365 } | |
| 2366 else | |
| 2367 { | |
| 2368 /* The generic case. 2..4 insns. */ | |
| 2369 static const char *const higher_parts[] = {"L", "ML", "MH", "H"}; | |
| 2370 const char *op = "SET"; | |
| 2371 const char *line_begin = ""; | |
| 2372 int insns = 0; | |
| 2373 int i; | |
| 111 | 2374 int64_t tmpvalue = value; |
| 0 | 2375 |
| 2376 /* Compute the number of insns needed to output this constant. */ | |
| 2377 for (i = 0; i < 4 && tmpvalue != 0; i++) | |
| 2378 { | |
| 2379 if (tmpvalue & 65535) | |
| 2380 insns++; | |
| 2381 tmpvalue >>= 16; | |
| 2382 } | |
| 2383 if (TARGET_BASE_ADDRESSES && insns == 3) | |
| 2384 { | |
| 2385 /* The number three is based on a static observation on | |
| 2386 ghostscript-6.52. Two and four are excluded because there | |
| 2387 are too many such constants, and each unique constant (maybe | |
| 2388 offset by 1..255) were used few times compared to other uses, | |
| 2389 e.g. addresses. | |
| 2390 | |
| 2391 We use base-plus-offset addressing to force it into a global | |
| 2392 register; we just use a "LDA reg,VALUE", which will cause the | |
| 2393 assembler and linker to DTRT (for constants as well as | |
| 2394 addresses). */ | |
| 2395 fprintf (stream, "LDA %s,", reg_names[regno]); | |
| 2396 mmix_output_octa (stream, value, 0); | |
| 2397 } | |
| 2398 else | |
| 2399 { | |
| 2400 /* Output pertinent parts of the 4-wyde sequence. | |
| 2401 Still more to do if we want this to be optimal, but hey... | |
| 2402 Note that the zero case has been handled above. */ | |
| 2403 for (i = 0; i < 4 && value != 0; i++) | |
| 2404 { | |
| 2405 if (value & 65535) | |
| 2406 { | |
| 2407 fprintf (stream, "%s%s%s %s,#%x", line_begin, op, | |
| 2408 higher_parts[i], reg_names[regno], | |
| 2409 (int) (value & 65535)); | |
| 2410 /* The first one sets the rest of the bits to 0, the next | |
| 2411 ones add set bits. */ | |
| 2412 op = "INC"; | |
| 2413 line_begin = "\n\t"; | |
| 2414 } | |
| 2415 | |
| 2416 value >>= 16; | |
| 2417 } | |
| 2418 } | |
| 2419 } | |
| 2420 | |
| 2421 if (do_begin_end) | |
| 2422 fprintf (stream, "\n"); | |
| 2423 } | |
| 2424 | |
| 2425 /* Return 1 if value is 0..65535*2**(16*N) for N=0..3. | |
| 2426 else return 0. */ | |
| 2427 | |
| 2428 int | |
| 111 | 2429 mmix_shiftable_wyde_value (uint64_t value) |
| 0 | 2430 { |
| 2431 /* Shift by 16 bits per group, stop when we've found two groups with | |
| 2432 nonzero bits. */ | |
| 2433 int i; | |
| 2434 int has_candidate = 0; | |
| 2435 | |
| 2436 for (i = 0; i < 4; i++) | |
| 2437 { | |
| 2438 if (value & 65535) | |
| 2439 { | |
| 2440 if (has_candidate) | |
| 2441 return 0; | |
| 2442 else | |
| 2443 has_candidate = 1; | |
| 2444 } | |
| 2445 | |
| 2446 value >>= 16; | |
| 2447 } | |
| 2448 | |
| 2449 return 1; | |
| 2450 } | |
| 2451 | |
|
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|
2452 /* X and Y are two things to compare using CODE. Return the rtx for |
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|
2453 the cc-reg in the proper mode. */ |
| 0 | 2454 |
| 2455 rtx | |
| 2456 mmix_gen_compare_reg (RTX_CODE code, rtx x, rtx y) | |
| 2457 { | |
| 111 | 2458 machine_mode ccmode = SELECT_CC_MODE (code, x, y); |
|
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|
2459 return gen_reg_rtx (ccmode); |
| 0 | 2460 } |
| 2461 | |
| 2462 /* Local (static) helper functions. */ | |
| 2463 | |
| 2464 static void | |
| 2465 mmix_emit_sp_add (HOST_WIDE_INT offset) | |
| 2466 { | |
| 2467 rtx insn; | |
| 2468 | |
| 2469 if (offset < 0) | |
| 2470 { | |
| 2471 /* Negative stack-pointer adjustments are allocations and appear in | |
| 2472 the prologue only. We mark them as frame-related so unwind and | |
| 2473 debug info is properly emitted for them. */ | |
| 2474 if (offset > -255) | |
| 2475 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2476 stack_pointer_rtx, | |
| 2477 GEN_INT (offset))); | |
| 2478 else | |
| 2479 { | |
| 2480 rtx tmpr = gen_rtx_REG (DImode, 255); | |
| 2481 RTX_FRAME_RELATED_P (emit_move_insn (tmpr, GEN_INT (offset))) = 1; | |
| 2482 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2483 stack_pointer_rtx, tmpr)); | |
| 2484 } | |
| 2485 RTX_FRAME_RELATED_P (insn) = 1; | |
| 2486 } | |
| 2487 else | |
| 2488 { | |
| 2489 /* Positive adjustments are in the epilogue only. Don't mark them | |
| 2490 as "frame-related" for unwind info. */ | |
| 111 | 2491 if (insn_const_int_ok_for_constraint (offset, CONSTRAINT_L)) |
| 0 | 2492 emit_insn (gen_adddi3 (stack_pointer_rtx, |
| 2493 stack_pointer_rtx, | |
| 2494 GEN_INT (offset))); | |
| 2495 else | |
| 2496 { | |
| 2497 rtx tmpr = gen_rtx_REG (DImode, 255); | |
| 2498 emit_move_insn (tmpr, GEN_INT (offset)); | |
| 2499 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
| 2500 stack_pointer_rtx, tmpr)); | |
| 2501 } | |
| 2502 } | |
| 2503 } | |
| 2504 | |
| 2505 /* Print operator suitable for doing something with a shiftable | |
| 2506 wyde. The type of operator is passed as an asm output modifier. */ | |
| 2507 | |
| 2508 static void | |
| 2509 mmix_output_shiftvalue_op_from_str (FILE *stream, | |
| 2510 const char *mainop, | |
| 111 | 2511 int64_t value) |
| 0 | 2512 { |
| 2513 static const char *const op_part[] = {"L", "ML", "MH", "H"}; | |
| 2514 int i; | |
| 2515 | |
| 2516 if (! mmix_shiftable_wyde_value (value)) | |
| 2517 { | |
| 2518 char s[sizeof ("0xffffffffffffffff")]; | |
| 111 | 2519 sprintf (s, "%#" PRIx64, value); |
| 0 | 2520 internal_error ("MMIX Internal: %s is not a shiftable int", s); |
| 2521 } | |
| 2522 | |
| 2523 for (i = 0; i < 4; i++) | |
| 2524 { | |
| 2525 /* We know we're through when we find one-bits in the low | |
| 2526 16 bits. */ | |
| 2527 if (value & 0xffff) | |
| 2528 { | |
| 2529 fprintf (stream, "%s%s", mainop, op_part[i]); | |
| 2530 return; | |
| 2531 } | |
| 2532 value >>= 16; | |
| 2533 } | |
| 2534 | |
| 2535 /* No bits set? Then it must have been zero. */ | |
| 2536 fprintf (stream, "%sL", mainop); | |
| 2537 } | |
| 2538 | |
| 2539 /* Print a 64-bit value, optionally prefixed by assembly pseudo. */ | |
| 2540 | |
| 2541 static void | |
| 111 | 2542 mmix_output_octa (FILE *stream, int64_t value, int do_begin_end) |
| 0 | 2543 { |
| 2544 if (do_begin_end) | |
| 2545 fprintf (stream, "\tOCTA "); | |
| 2546 | |
| 2547 /* Provide a few alternative output formats depending on the number, to | |
| 2548 improve legibility of assembler output. */ | |
| 111 | 2549 if ((value < (int64_t) 0 && value > (int64_t) -10000) |
| 2550 || (value >= (int64_t) 0 && value <= (int64_t) 16384)) | |
| 0 | 2551 fprintf (stream, "%d", (int) value); |
| 111 | 2552 else if (value > (int64_t) 0 |
| 2553 && value < ((int64_t) 1 << 31) * 2) | |
| 0 | 2554 fprintf (stream, "#%x", (unsigned int) value); |
| 111 | 2555 else if (sizeof (HOST_WIDE_INT) == sizeof (int64_t)) |
| 2556 /* We need to avoid the not-so-universal "0x" prefix; we need the | |
| 2557 pure hex-digits together with the mmixal "#" hex prefix. */ | |
| 2558 fprintf (stream, "#" HOST_WIDE_INT_PRINT_HEX_PURE, | |
| 2559 (HOST_WIDE_INT) value); | |
| 2560 else /* Need to avoid the hex output; there's no ...WIDEST...HEX_PURE. */ | |
| 2561 fprintf (stream, "%" PRIu64, value); | |
| 0 | 2562 |
| 2563 if (do_begin_end) | |
| 2564 fprintf (stream, "\n"); | |
| 2565 } | |
| 2566 | |
| 2567 /* Print the presumed shiftable wyde argument shifted into place (to | |
| 2568 be output with an operand). */ | |
| 2569 | |
| 2570 static void | |
| 111 | 2571 mmix_output_shifted_value (FILE *stream, int64_t value) |
| 0 | 2572 { |
| 2573 int i; | |
| 2574 | |
| 2575 if (! mmix_shiftable_wyde_value (value)) | |
| 2576 { | |
| 2577 char s[16+2+1]; | |
| 111 | 2578 sprintf (s, "%#" PRIx64, value); |
| 0 | 2579 internal_error ("MMIX Internal: %s is not a shiftable int", s); |
| 2580 } | |
| 2581 | |
| 2582 for (i = 0; i < 4; i++) | |
| 2583 { | |
| 2584 /* We know we're through when we find one-bits in the low 16 bits. */ | |
| 2585 if (value & 0xffff) | |
| 2586 { | |
| 2587 fprintf (stream, "#%x", (int) (value & 0xffff)); | |
| 2588 return; | |
| 2589 } | |
| 2590 | |
| 2591 value >>= 16; | |
| 2592 } | |
| 2593 | |
| 2594 /* No bits set? Then it must have been zero. */ | |
| 2595 fprintf (stream, "0"); | |
| 2596 } | |
| 2597 | |
| 2598 /* Output an MMIX condition name corresponding to an operator | |
| 2599 and operands: | |
| 2600 (comparison_operator [(comparison_operator ...) (const_int 0)]) | |
| 2601 which means we have to look at *two* operators. | |
| 2602 | |
| 2603 The argument "reversed" refers to reversal of the condition (not the | |
| 2604 same as swapping the arguments). */ | |
| 2605 | |
| 2606 static void | |
| 111 | 2607 mmix_output_condition (FILE *stream, const_rtx x, int reversed) |
| 0 | 2608 { |
| 2609 struct cc_conv | |
| 2610 { | |
| 2611 RTX_CODE cc; | |
| 2612 | |
| 2613 /* The normal output cc-code. */ | |
| 2614 const char *const normal; | |
| 2615 | |
| 2616 /* The reversed cc-code, or NULL if invalid. */ | |
| 2617 const char *const reversed; | |
| 2618 }; | |
| 2619 | |
| 2620 struct cc_type_conv | |
| 2621 { | |
| 111 | 2622 machine_mode cc_mode; |
| 0 | 2623 |
| 2624 /* Terminated with {UNKNOWN, NULL, NULL} */ | |
| 2625 const struct cc_conv *const convs; | |
| 2626 }; | |
| 2627 | |
| 2628 #undef CCEND | |
| 2629 #define CCEND {UNKNOWN, NULL, NULL} | |
| 2630 | |
| 2631 static const struct cc_conv cc_fun_convs[] | |
| 2632 = {{ORDERED, "Z", "P"}, | |
| 2633 {UNORDERED, "P", "Z"}, | |
| 2634 CCEND}; | |
| 2635 static const struct cc_conv cc_fp_convs[] | |
| 2636 = {{GT, "P", NULL}, | |
| 2637 {LT, "N", NULL}, | |
| 2638 CCEND}; | |
| 2639 static const struct cc_conv cc_fpeq_convs[] | |
| 2640 = {{NE, "Z", "P"}, | |
| 2641 {EQ, "P", "Z"}, | |
| 2642 CCEND}; | |
| 2643 static const struct cc_conv cc_uns_convs[] | |
| 2644 = {{GEU, "NN", "N"}, | |
| 2645 {GTU, "P", "NP"}, | |
| 2646 {LEU, "NP", "P"}, | |
| 2647 {LTU, "N", "NN"}, | |
| 2648 CCEND}; | |
| 2649 static const struct cc_conv cc_signed_convs[] | |
| 2650 = {{NE, "NZ", "Z"}, | |
| 2651 {EQ, "Z", "NZ"}, | |
| 2652 {GE, "NN", "N"}, | |
| 2653 {GT, "P", "NP"}, | |
| 2654 {LE, "NP", "P"}, | |
| 2655 {LT, "N", "NN"}, | |
| 2656 CCEND}; | |
| 2657 static const struct cc_conv cc_di_convs[] | |
| 2658 = {{NE, "NZ", "Z"}, | |
| 2659 {EQ, "Z", "NZ"}, | |
| 2660 {GE, "NN", "N"}, | |
| 2661 {GT, "P", "NP"}, | |
| 2662 {LE, "NP", "P"}, | |
| 2663 {LT, "N", "NN"}, | |
| 2664 {GTU, "NZ", "Z"}, | |
| 2665 {LEU, "Z", "NZ"}, | |
| 2666 CCEND}; | |
| 2667 #undef CCEND | |
| 2668 | |
| 2669 static const struct cc_type_conv cc_convs[] | |
| 111 | 2670 = {{E_CC_FUNmode, cc_fun_convs}, |
| 2671 {E_CC_FPmode, cc_fp_convs}, | |
| 2672 {E_CC_FPEQmode, cc_fpeq_convs}, | |
| 2673 {E_CC_UNSmode, cc_uns_convs}, | |
| 2674 {E_CCmode, cc_signed_convs}, | |
| 2675 {E_DImode, cc_di_convs}}; | |
| 0 | 2676 |
| 2677 size_t i; | |
| 2678 int j; | |
| 2679 | |
| 111 | 2680 machine_mode mode = GET_MODE (XEXP (x, 0)); |
| 0 | 2681 RTX_CODE cc = GET_CODE (x); |
| 2682 | |
| 2683 for (i = 0; i < ARRAY_SIZE (cc_convs); i++) | |
| 2684 { | |
| 2685 if (mode == cc_convs[i].cc_mode) | |
| 2686 { | |
| 2687 for (j = 0; cc_convs[i].convs[j].cc != UNKNOWN; j++) | |
| 2688 if (cc == cc_convs[i].convs[j].cc) | |
| 2689 { | |
| 2690 const char *mmix_cc | |
| 2691 = (reversed ? cc_convs[i].convs[j].reversed | |
| 2692 : cc_convs[i].convs[j].normal); | |
| 2693 | |
| 2694 if (mmix_cc == NULL) | |
| 2695 fatal_insn ("MMIX Internal: Trying to output invalidly\ | |
| 2696 reversed condition:", x); | |
| 2697 | |
| 2698 fprintf (stream, "%s", mmix_cc); | |
| 2699 return; | |
| 2700 } | |
| 2701 | |
| 2702 fatal_insn ("MMIX Internal: What's the CC of this?", x); | |
| 2703 } | |
| 2704 } | |
| 2705 | |
| 2706 fatal_insn ("MMIX Internal: What is the CC of this?", x); | |
| 2707 } | |
| 2708 | |
| 2709 /* Return the bit-value for a const_int or const_double. */ | |
| 2710 | |
| 111 | 2711 int64_t |
| 2712 mmix_intval (const_rtx x) | |
| 0 | 2713 { |
| 2714 if (GET_CODE (x) == CONST_INT) | |
| 2715 return INTVAL (x); | |
| 2716 | |
| 2717 /* We make a little song and dance because converting to long long in | |
| 2718 gcc-2.7.2 is broken. I still want people to be able to use it for | |
| 2719 cross-compilation to MMIX. */ | |
| 2720 if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == VOIDmode) | |
| 111 | 2721 return CONST_DOUBLE_HIGH (x); |
| 0 | 2722 |
| 2723 if (GET_CODE (x) == CONST_DOUBLE) | |
| 2724 { | |
| 2725 if (GET_MODE (x) == DFmode) | |
| 2726 { | |
| 2727 long bits[2]; | |
| 2728 | |
| 111 | 2729 REAL_VALUE_TO_TARGET_DOUBLE (*CONST_DOUBLE_REAL_VALUE (x), bits); |
| 0 | 2730 |
| 2731 /* The double cast is necessary to avoid getting the long | |
| 2732 sign-extended to unsigned long long(!) when they're of | |
| 2733 different size (usually 32-bit hosts). */ | |
| 2734 return | |
| 111 | 2735 ((uint64_t) (unsigned long) bits[0] |
| 2736 << (uint64_t) 32U) | |
| 2737 | (uint64_t) (unsigned long) bits[1]; | |
| 0 | 2738 } |
| 2739 else if (GET_MODE (x) == SFmode) | |
| 2740 { | |
| 2741 long bits; | |
| 111 | 2742 REAL_VALUE_TO_TARGET_SINGLE (*CONST_DOUBLE_REAL_VALUE (x), bits); |
| 0 | 2743 |
| 2744 return (unsigned long) bits; | |
| 2745 } | |
| 2746 } | |
| 2747 | |
| 2748 fatal_insn ("MMIX Internal: This is not a constant:", x); | |
| 2749 } | |
| 2750 | |
|
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|
2751 /* Worker function for TARGET_PROMOTE_FUNCTION_MODE. */ |
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|
2752 |
| 111 | 2753 machine_mode |
|
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|
2754 mmix_promote_function_mode (const_tree type ATTRIBUTE_UNUSED, |
| 111 | 2755 machine_mode mode, |
|
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|
2756 int *punsignedp ATTRIBUTE_UNUSED, |
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|
2757 const_tree fntype ATTRIBUTE_UNUSED, |
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|
2758 int for_return) |
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|
2759 { |
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|
2760 /* Apparently not doing TRT if int < register-size. FIXME: Perhaps |
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|
2761 FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say. */ |
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|
2762 if (for_return == 1) |
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|
2763 return mode; |
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|
2764 |
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2765 /* Promotion of modes currently generates slow code, extending before |
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2766 operation, so we do it only for arguments. */ |
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|
2767 if (GET_MODE_CLASS (mode) == MODE_INT |
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2768 && GET_MODE_SIZE (mode) < 8) |
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|
2769 return DImode; |
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2770 else |
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2771 return mode; |
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2772 } |
| 0 | 2773 /* Worker function for TARGET_STRUCT_VALUE_RTX. */ |
| 2774 | |
| 2775 static rtx | |
| 2776 mmix_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED, | |
| 2777 int incoming ATTRIBUTE_UNUSED) | |
| 2778 { | |
| 2779 return gen_rtx_REG (Pmode, MMIX_STRUCT_VALUE_REGNUM); | |
| 2780 } | |
| 2781 | |
|
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2782 /* Worker function for TARGET_FRAME_POINTER_REQUIRED. |
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2783 |
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2784 FIXME: Is this requirement built-in? Anyway, we should try to get rid |
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2785 of it; we can deduce the value. */ |
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2786 |
|
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2787 bool |
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2788 mmix_frame_pointer_required (void) |
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|
2789 { |
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2790 return (cfun->has_nonlocal_label); |
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|
2791 } |
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2792 |
| 0 | 2793 /* |
| 2794 * Local variables: | |
| 2795 * eval: (c-set-style "gnu") | |
| 2796 * indent-tabs-mode: t | |
| 2797 * End: | |
| 2798 */ |