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111
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1 /* Common hooks for IBM RS/6000.
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131
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2 Copyright (C) 1991-2018 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 #include "params.h"
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30
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31 /* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
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32 static const struct default_options rs6000_option_optimization_table[] =
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33 {
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34 /* Enable -fsched-pressure for first pass instruction scheduling. */
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35 { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
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36 { OPT_LEVELS_NONE, 0, NULL, 0 }
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37 };
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38
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39 /* Implement TARGET_OPTION_INIT_STRUCT. */
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40
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41 static void
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42 rs6000_option_init_struct (struct gcc_options *opts)
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43 {
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44 if (DEFAULT_ABI == ABI_DARWIN)
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45 /* The Darwin libraries never set errno, so we might as well
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46 avoid calling them when that's the only reason we would. */
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47 opts->x_flag_errno_math = 0;
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48
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49 /* Enable section anchors by default. */
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50 if (!TARGET_MACHO)
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51 opts->x_flag_section_anchors = 1;
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131
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52
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53 /* By default, always emit DWARF-2 unwind info. This allows debugging
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54 without maintaining a stack frame back-chain. It also allows the
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55 debugger to find out where on-entry register values are stored at any
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56 point in a function, without having to analyze the executable code (which
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57 isn't even possible to do in the general case). */
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58 #ifdef OBJECT_FORMAT_ELF
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59 opts->x_flag_asynchronous_unwind_tables = 1;
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60 #endif
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111
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61 }
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62
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63 /* Implement TARGET_OPTION_DEFAULT_PARAMS. */
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64
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65 static void
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66 rs6000_option_default_params (void)
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67 {
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68 /* Double growth factor to counter reduced min jump length. */
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69 set_default_param_value (PARAM_MAX_GROW_COPY_BB_INSNS, 16);
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70 }
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71
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72 /* If not otherwise specified by a target, make 'long double' equivalent to
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73 'double'. */
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74
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75 #ifndef RS6000_DEFAULT_LONG_DOUBLE_SIZE
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76 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 64
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77 #endif
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78
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79 /* Implement TARGET_HANDLE_OPTION. */
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80
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81 static bool
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82 rs6000_handle_option (struct gcc_options *opts, struct gcc_options *opts_set,
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83 const struct cl_decoded_option *decoded,
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84 location_t loc)
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85 {
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86 char *p, *q;
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87 size_t code = decoded->opt_index;
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88 const char *arg = decoded->arg;
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89 int value = decoded->value;
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90
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91 switch (code)
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92 {
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93 case OPT_mfull_toc:
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94 opts->x_rs6000_isa_flags &= ~OPTION_MASK_MINIMAL_TOC;
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95 opts->x_TARGET_NO_FP_IN_TOC = 0;
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96 opts->x_TARGET_NO_SUM_IN_TOC = 0;
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97 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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98 #ifdef TARGET_USES_SYSV4_OPT
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99 /* Note, V.4 no longer uses a normal TOC, so make -mfull-toc, be
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100 just the same as -mminimal-toc. */
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101 opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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102 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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103 #endif
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104 break;
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105
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106 #ifdef TARGET_USES_SYSV4_OPT
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107 case OPT_mtoc:
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108 /* Make -mtoc behave like -mminimal-toc. */
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109 opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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110 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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111 break;
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112 #endif
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113
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114 #ifdef TARGET_USES_AIX64_OPT
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115 case OPT_maix64:
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116 #else
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117 case OPT_m64:
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118 #endif
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119 opts->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64;
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120 opts->x_rs6000_isa_flags |= (~opts_set->x_rs6000_isa_flags
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121 & OPTION_MASK_PPC_GFXOPT);
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122 opts_set->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64;
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123 break;
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124
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125 #ifdef TARGET_USES_AIX64_OPT
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126 case OPT_maix32:
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127 #else
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128 case OPT_m32:
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129 #endif
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130 opts->x_rs6000_isa_flags &= ~OPTION_MASK_POWERPC64;
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131 opts_set->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64;
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132 break;
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133
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134 case OPT_mminimal_toc:
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135 if (value == 1)
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136 {
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137 opts->x_TARGET_NO_FP_IN_TOC = 0;
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138 opts->x_TARGET_NO_SUM_IN_TOC = 0;
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139 }
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140 break;
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141
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142 case OPT_mpowerpc_gpopt:
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143 case OPT_mpowerpc_gfxopt:
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144 break;
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145
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146 case OPT_mdebug_:
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147 p = ASTRDUP (arg);
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148 opts->x_rs6000_debug = 0;
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149
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150 while ((q = strtok (p, ",")) != NULL)
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151 {
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152 unsigned mask = 0;
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153 bool invert;
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154
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155 p = NULL;
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156 if (*q == '!')
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157 {
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158 invert = true;
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159 q++;
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160 }
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161 else
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162 invert = false;
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163
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164 if (! strcmp (q, "all"))
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165 mask = MASK_DEBUG_ALL;
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166 else if (! strcmp (q, "stack"))
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167 mask = MASK_DEBUG_STACK;
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168 else if (! strcmp (q, "arg"))
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169 mask = MASK_DEBUG_ARG;
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170 else if (! strcmp (q, "reg"))
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171 mask = MASK_DEBUG_REG;
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172 else if (! strcmp (q, "addr"))
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173 mask = MASK_DEBUG_ADDR;
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174 else if (! strcmp (q, "cost"))
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175 mask = MASK_DEBUG_COST;
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176 else if (! strcmp (q, "target"))
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177 mask = MASK_DEBUG_TARGET;
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178 else if (! strcmp (q, "builtin"))
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179 mask = MASK_DEBUG_BUILTIN;
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180 else
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181 error_at (loc, "unknown -mdebug-%s switch", q);
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182
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183 if (invert)
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184 opts->x_rs6000_debug &= ~mask;
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185 else
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186 opts->x_rs6000_debug |= mask;
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187 }
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188 break;
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189
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190 #ifdef TARGET_USES_SYSV4_OPT
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191 case OPT_mrelocatable:
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192 if (value == 1)
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193 {
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194 opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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195 opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC;
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196 opts->x_TARGET_NO_FP_IN_TOC = 1;
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197 }
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198 break;
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199
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200 case OPT_mrelocatable_lib:
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201 if (value == 1)
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202 {
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203 opts->x_rs6000_isa_flags |= (OPTION_MASK_RELOCATABLE
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204 | OPTION_MASK_MINIMAL_TOC);
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205 opts_set->x_rs6000_isa_flags |= (OPTION_MASK_RELOCATABLE
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206 | OPTION_MASK_MINIMAL_TOC);
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207 opts->x_TARGET_NO_FP_IN_TOC = 1;
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208 }
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209 else
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210 {
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211 opts->x_rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE;
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212 opts_set->x_rs6000_isa_flags |= OPTION_MASK_RELOCATABLE;
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213 }
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214 break;
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215 #endif
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216
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217 case OPT_mlong_double_:
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218 if (value != 64 && value != 128)
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219 {
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220 error_at (loc, "unknown switch -mlong-double-%s", arg);
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221 opts->x_rs6000_long_double_type_size
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222 = RS6000_DEFAULT_LONG_DOUBLE_SIZE;
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223 return false;
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224 }
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225 break;
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226
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227 case OPT_mrecip:
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228 opts->x_rs6000_recip_name = (value) ? "default" : "none";
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229 break;
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230 }
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231 return true;
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232 }
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233
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234 /* -fsplit-stack uses a field in the TCB, available with glibc-2.19.
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235 We also allow 2.18 because alignment padding guarantees that the
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236 space is available there too. */
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237
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238 static bool
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239 rs6000_supports_split_stack (bool report,
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240 struct gcc_options *opts ATTRIBUTE_UNUSED)
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241 {
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242 #ifndef TARGET_GLIBC_MAJOR
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243 #define TARGET_GLIBC_MAJOR 0
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244 #endif
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245 #ifndef TARGET_GLIBC_MINOR
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246 #define TARGET_GLIBC_MINOR 0
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247 #endif
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248 /* Note: Can't test DEFAULT_ABI here, it isn't set until later. */
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249 if (TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
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250 && TARGET_64BIT
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251 && TARGET_ELF)
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252 return true;
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253
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254 if (report)
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255 error ("%<-fsplit-stack%> currently only supported on PowerPC64 GNU/Linux with glibc-2.18 or later");
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256 return false;
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257 }
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258
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259 #undef TARGET_HANDLE_OPTION
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260 #define TARGET_HANDLE_OPTION rs6000_handle_option
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261
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262 #undef TARGET_OPTION_INIT_STRUCT
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263 #define TARGET_OPTION_INIT_STRUCT rs6000_option_init_struct
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264
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265 #undef TARGET_OPTION_DEFAULT_PARAMS
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266 #define TARGET_OPTION_DEFAULT_PARAMS rs6000_option_default_params
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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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