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111
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1 /* Common hooks for IBM RS/6000.
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145
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2 Copyright (C) 1991-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published
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8 by the Free Software Foundation; either version 3, or (at your
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9 option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "diagnostic-core.h"
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24 #include "tm.h"
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25 #include "common/common-target.h"
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26 #include "common/common-target-def.h"
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27 #include "opts.h"
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28 #include "flags.h"
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29
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30 /* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
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31 static const struct default_options rs6000_option_optimization_table[] =
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32 {
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145
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33 /* Split multi-word types early. */
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34 { OPT_LEVELS_ALL, OPT_fsplit_wide_types_early, NULL, 1 },
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111
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35 /* Enable -fsched-pressure for first pass instruction scheduling. */
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36 { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
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145
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37 /* Enable -munroll-only-small-loops with -funroll-loops to unroll small
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38 loops at -O2 and above by default. */
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39 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_funroll_loops, NULL, 1 },
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40 { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_munroll_only_small_loops, NULL, 1 },
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41 /* -fweb and -frename-registers are useless in general for rs6000,
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42 turn them off. */
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43 { OPT_LEVELS_ALL, OPT_fweb, NULL, 0 },
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44 { OPT_LEVELS_ALL, OPT_frename_registers, NULL, 0 },
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45
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46 /* Double growth factor to counter reduced min jump length. */
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47 { OPT_LEVELS_ALL, OPT__param_max_grow_copy_bb_insns_, NULL, 16 },
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111
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48 { OPT_LEVELS_NONE, 0, NULL, 0 }
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49 };
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50
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51 /* Implement TARGET_OPTION_INIT_STRUCT. */
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52
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53 static void
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54 rs6000_option_init_struct (struct gcc_options *opts)
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55 {
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56 if (DEFAULT_ABI == ABI_DARWIN)
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57 /* The Darwin libraries never set errno, so we might as well
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58 avoid calling them when that's the only reason we would. */
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59 opts->x_flag_errno_math = 0;
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60
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61 /* Enable section anchors by default. */
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62 if (!TARGET_MACHO)
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63 opts->x_flag_section_anchors = 1;
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131
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64
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65 /* By default, always emit DWARF-2 unwind info. This allows debugging
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66 without maintaining a stack frame back-chain. It also allows the
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67 debugger to find out where on-entry register values are stored at any
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68 point in a function, without having to analyze the executable code (which
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69 isn't even possible to do in the general case). */
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70 #ifdef OBJECT_FORMAT_ELF
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71 opts->x_flag_asynchronous_unwind_tables = 1;
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72 #endif
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111
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73 }
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74
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75 /* If not otherwise specified by a target, make 'long double' equivalent to
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76 'double'. */
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77
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78 #ifndef RS6000_DEFAULT_LONG_DOUBLE_SIZE
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79 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 64
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80 #endif
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81
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82 /* Implement TARGET_HANDLE_OPTION. */
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83
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84 static bool
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85 rs6000_handle_option (struct gcc_options *opts, struct gcc_options *opts_set,
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86 const struct cl_decoded_option *decoded,
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87 location_t loc)
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88 {
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89 char *p, *q;
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90 size_t code = decoded->opt_index;
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91 const char *arg = decoded->arg;
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92 int value = decoded->value;
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93
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94 switch (code)
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95 {
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96 case OPT_mfull_toc:
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97 opts->x_rs6000_isa_flags &= ~OPTION_MASK_MINIMAL_TOC;
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98 opts->x_TARGET_NO_FP_IN_TOC = 0;
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99 opts->x_TARGET_NO_SUM_IN_TOC = 0;
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100 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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101 #ifdef TARGET_USES_SYSV4_OPT
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102 /* Note, V.4 no longer uses a normal TOC, so make -mfull-toc, be
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103 just the same as -mminimal-toc. */
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104 opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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105 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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106 #endif
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107 break;
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108
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109 #ifdef TARGET_USES_SYSV4_OPT
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110 case OPT_mtoc:
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111 /* Make -mtoc behave like -mminimal-toc. */
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112 opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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113 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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114 break;
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115 #endif
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116
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117 #ifdef TARGET_USES_AIX64_OPT
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118 case OPT_maix64:
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119 #else
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120 case OPT_m64:
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121 #endif
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122 opts->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64;
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123 opts->x_rs6000_isa_flags |= (~opts_set->x_rs6000_isa_flags
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124 & OPTION_MASK_PPC_GFXOPT);
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125 opts_set->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64;
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126 break;
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127
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128 #ifdef TARGET_USES_AIX64_OPT
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129 case OPT_maix32:
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130 #else
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131 case OPT_m32:
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132 #endif
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133 opts->x_rs6000_isa_flags &= ~OPTION_MASK_POWERPC64;
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134 opts_set->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64;
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135 break;
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136
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137 case OPT_mminimal_toc:
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138 if (value == 1)
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139 {
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140 opts->x_TARGET_NO_FP_IN_TOC = 0;
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141 opts->x_TARGET_NO_SUM_IN_TOC = 0;
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142 }
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143 break;
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144
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145 case OPT_mpowerpc_gpopt:
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146 case OPT_mpowerpc_gfxopt:
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147 break;
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148
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149 case OPT_mdebug_:
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150 p = ASTRDUP (arg);
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151 opts->x_rs6000_debug = 0;
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152
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153 while ((q = strtok (p, ",")) != NULL)
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154 {
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155 unsigned mask = 0;
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156 bool invert;
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157
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158 p = NULL;
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159 if (*q == '!')
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160 {
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161 invert = true;
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162 q++;
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163 }
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164 else
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165 invert = false;
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166
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167 if (! strcmp (q, "all"))
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168 mask = MASK_DEBUG_ALL;
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169 else if (! strcmp (q, "stack"))
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170 mask = MASK_DEBUG_STACK;
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171 else if (! strcmp (q, "arg"))
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172 mask = MASK_DEBUG_ARG;
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173 else if (! strcmp (q, "reg"))
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174 mask = MASK_DEBUG_REG;
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175 else if (! strcmp (q, "addr"))
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176 mask = MASK_DEBUG_ADDR;
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177 else if (! strcmp (q, "cost"))
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178 mask = MASK_DEBUG_COST;
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179 else if (! strcmp (q, "target"))
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180 mask = MASK_DEBUG_TARGET;
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181 else if (! strcmp (q, "builtin"))
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182 mask = MASK_DEBUG_BUILTIN;
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183 else
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145
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184 error_at (loc, "unknown %<-mdebug-%s%> switch", q);
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111
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185
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186 if (invert)
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187 opts->x_rs6000_debug &= ~mask;
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188 else
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189 opts->x_rs6000_debug |= mask;
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190 }
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191 break;
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192
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193 #ifdef TARGET_USES_SYSV4_OPT
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194 case OPT_mrelocatable:
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195 if (value == 1)
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196 {
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197 opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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198 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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199 opts->x_TARGET_NO_FP_IN_TOC = 1;
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200 }
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201 break;
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202
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203 case OPT_mrelocatable_lib:
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204 if (value == 1)
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205 {
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206 opts->x_rs6000_isa_flags |= (OPTION_MASK_RELOCATABLE
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207 | OPTION_MASK_MINIMAL_TOC);
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208 opts_set->x_rs6000_isa_flags |= (OPTION_MASK_RELOCATABLE
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209 | OPTION_MASK_MINIMAL_TOC);
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210 opts->x_TARGET_NO_FP_IN_TOC = 1;
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211 }
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212 else
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213 {
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214 opts->x_rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;
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215 opts_set->x_rs6000_isa_flags |= OPTION_MASK_RELOCATABLE;
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216 }
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217 break;
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218 #endif
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219
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220 case OPT_mlong_double_:
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221 if (value != 64 && value != 128)
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222 {
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145
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223 error_at (loc, "unknown switch %<-mlong-double-%s%>", arg);
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111
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224 opts->x_rs6000_long_double_type_size
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225 = RS6000_DEFAULT_LONG_DOUBLE_SIZE;
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226 return false;
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227 }
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228 break;
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229
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230 case OPT_mrecip:
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231 opts->x_rs6000_recip_name = (value) ? "default" : "none";
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232 break;
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233 }
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234 return true;
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235 }
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236
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237 /* -fsplit-stack uses a field in the TCB, available with glibc-2.19.
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238 We also allow 2.18 because alignment padding guarantees that the
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239 space is available there too. */
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240
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241 static bool
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242 rs6000_supports_split_stack (bool report,
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243 struct gcc_options *opts ATTRIBUTE_UNUSED)
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244 {
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245 #ifndef TARGET_GLIBC_MAJOR
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246 #define TARGET_GLIBC_MAJOR 0
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247 #endif
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248 #ifndef TARGET_GLIBC_MINOR
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249 #define TARGET_GLIBC_MINOR 0
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250 #endif
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251 /* Note: Can't test DEFAULT_ABI here, it isn't set until later. */
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252 if (TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
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253 && TARGET_64BIT
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254 && TARGET_ELF)
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255 return true;
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256
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257 if (report)
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258 error ("%<-fsplit-stack%> currently only supported on PowerPC64 GNU/Linux with glibc-2.18 or later");
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259 return false;
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260 }
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261
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262 #undef TARGET_HANDLE_OPTION
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263 #define TARGET_HANDLE_OPTION rs6000_handle_option
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264
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265 #undef TARGET_OPTION_INIT_STRUCT
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266 #define TARGET_OPTION_INIT_STRUCT rs6000_option_init_struct
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267
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268 #undef TARGET_OPTION_OPTIMIZATION_TABLE
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269 #define TARGET_OPTION_OPTIMIZATION_TABLE rs6000_option_optimization_table
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270
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271 #undef TARGET_SUPPORTS_SPLIT_STACK
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272 #define TARGET_SUPPORTS_SPLIT_STACK rs6000_supports_split_stack
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273
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274 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
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