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1 ; Options for the CRIS port of the compiler.
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3 ; Copyright (C) 2005-2017 Free Software Foundation, Inc.
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4 ;
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5 ; This file is part of GCC.
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6 ;
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7 ; GCC is free software; you can redistribute it and/or modify it under
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8 ; the terms of the GNU General Public License as published by the Free
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9 ; Software Foundation; either version 3, or (at your option) any later
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10 ; version.
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11 ;
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12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 ; for more details.
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16 ;
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17 ; You should have received a copy of the GNU General Public License
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18 ; along with GCC; see the file COPYING3. If not see
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19 ; <http://www.gnu.org/licenses/>.
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20
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21 ; TARGET_MUL_BUG: Whether or not to work around multiplication
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22 ; instruction hardware bug when generating code for models where
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23 ; it may be present. From the trouble report for Etrax 100 LX:
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24 ; "A multiply operation may cause incorrect cache behavior
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25 ; under some specific circumstances. The problem can occur if
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26 ; the instruction following the multiply instruction causes a
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27 ; cache miss, and multiply operand 1 (source operand) bits
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28 ; [31:27] matches the logical mapping of the mode register
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29 ; address (0xb0....), and bits [9:2] of operand 1 matches the
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30 ; TLB register address (0x258-0x25f). There is such a mapping
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31 ; in kernel mode or when the MMU is off. Normally there is no
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32 ; such mapping in user mode, and the problem will therefore
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33 ; probably not occur in Linux user mode programs."
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34 ;
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35 ; We have no sure-fire way to know from within GCC that we're
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36 ; compiling a user program. For example, -fpic/PIC is used in
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37 ; libgcc which is linked into the kernel. However, the
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38 ; workaround option -mno-mul-bug can be safely used per-package
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39 ; when compiling programs. The same goes for general user-only
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40 ; libraries such as glibc, since there's no user-space
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41 ; driver-like program that gets a mapping of I/O registers (all
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42 ; on the same page, including the TLB registers).
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43 mmul-bug-workaround
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44 Target Report Mask(MUL_BUG)
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45 Work around bug in multiplication instruction.
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46
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47 ; TARGET_ETRAX4_ADD: Instruction-set additions from Etrax 4 and up.
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48 ; (Just "lz".)
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49 metrax4
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50 Target Report Mask(ETRAX4_ADD)
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51 Compile for ETRAX 4 (CRIS v3).
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52
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53 ; See cris_handle_option.
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54 metrax100
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55 Target Report RejectNegative
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56 Compile for ETRAX 100 (CRIS v8).
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57
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58 ; See cris_handle_option.
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59 mno-etrax100
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60 Target Report RejectNegative Undocumented
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61
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62 mpdebug
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63 Target Report Mask(PDEBUG)
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64 Emit verbose debug information in assembly code.
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65
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66 ; TARGET_CCINIT: Whether to use condition-codes generated by
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67 ; insns other than the immediately preceding compare/test insn.
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68 ; Used to check for errors in notice_update_cc.
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69 mcc-init
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70 Target Report Mask(CCINIT)
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71 Do not use condition codes from normal instructions.
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72
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73 ; TARGET_SIDE_EFFECT_PREFIXES: Whether to use side-effect
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74 ; patterns. Used to debug the [rx=ry+i] type patterns.
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75 mside-effects
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76 Target Report RejectNegative Mask(SIDE_EFFECT_PREFIXES) Undocumented
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77
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78 mno-side-effects
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79 Target Report RejectNegative InverseMask(SIDE_EFFECT_PREFIXES)
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80 Do not emit addressing modes with side-effect assignment.
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81
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82 ; TARGET_STACK_ALIGN: Whether to *keep* (not force) alignment of
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83 ; stack at 16 (or 32, depending on TARGET_ALIGN_BY_32) bits.
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84 mstack-align
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85 Target Report RejectNegative Mask(STACK_ALIGN) Undocumented
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86
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87 mno-stack-align
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88 Target Report RejectNegative InverseMask(STACK_ALIGN)
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89 Do not tune stack alignment.
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90
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91 ; TARGET_DATA_ALIGN: Whether to do alignment on individual
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92 ; modifiable objects.
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93 mdata-align
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94 Target Report RejectNegative Mask(DATA_ALIGN) Undocumented
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95
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96 mno-data-align
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97 Target Report RejectNegative InverseMask(DATA_ALIGN)
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98 Do not tune writable data alignment.
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99
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100 ; TARGET_CONST_ALIGN: Whether to do alignment on individual
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101 ; non-modifiable objects.
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102 mconst-align
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103 Target Report RejectNegative Mask(CONST_ALIGN) Undocumented
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104
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105 mno-const-align
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106 Target Report RejectNegative InverseMask(CONST_ALIGN)
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107 Do not tune code and read-only data alignment.
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108
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109 ; See cris_handle_option.
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110 m32-bit
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111 Target Report RejectNegative Undocumented
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112
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113 ; See cris_handle_option.
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114 m32bit
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115 Target Report RejectNegative
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116 Align code and data to 32 bits.
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117
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118 ; See cris_handle_option.
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119 m16-bit
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120 Target Report RejectNegative Undocumented
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121
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122 ; See cris_handle_option.
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123 m16bit
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124 Target Report RejectNegative Undocumented
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125
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126 ; See cris_handle_option.
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127 m8-bit
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128 Target Report RejectNegative Undocumented
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129
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130 ; See cris_handle_option.
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131 m8bit
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132 Target Report RejectNegative
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133 Don't align items in code or data.
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134
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135 ; TARGET_PROLOGUE_EPILOGUE: Whether or not to omit function
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136 ; prologue and epilogue.
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137 mprologue-epilogue
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138 Target Report RejectNegative Mask(PROLOGUE_EPILOGUE) Undocumented
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139
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140 mno-prologue-epilogue
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141 Target Report RejectNegative InverseMask(PROLOGUE_EPILOGUE)
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142 Do not emit function prologue or epilogue.
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143
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144 ; We have to handle this m-option here since we can't wash it
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145 ; off in both CC1_SPEC and CC1PLUS_SPEC.
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146
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147 mbest-lib-options
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148 Target Report RejectNegative
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149 Use the most feature-enabling options allowed by other options.
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150
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151 ; FIXME: The following comment relates to gcc before cris.opt.
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152 ; Check if it's still valid:
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153 ; We must call it "override-" since calling it "no-" will cause
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154 ; gcc.c to forget it, if there's a "later" -mbest-lib-options.
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155 ; Kludgy, but needed for some multilibbed files.
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156 moverride-best-lib-options
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157 Target Report RejectNegative
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158 Override -mbest-lib-options.
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159
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160 mcpu=
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161 Target Report RejectNegative Joined Undocumented Var(cris_cpu_str)
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162
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163 march=
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164 Target Report RejectNegative Joined Var(cris_cpu_str)
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165 -march=ARCH Generate code for the specified chip or CPU version.
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166
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167 mtune=
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168 Target Report RejectNegative Joined Var(cris_tune_str)
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169 -mtune=ARCH Tune alignment for the specified chip or CPU version.
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170
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171 mmax-stackframe=
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172 Target Report RejectNegative Joined Var(cris_max_stackframe_str)
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173 -mmax-stackframe=SIZE Warn when a stackframe is larger than the specified size.
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174
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175 max-stackframe=
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176 Target Report RejectNegative Joined Undocumented Var(cris_max_stackframe_str)
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177
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178 mtrap-using-break8
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179 Target Report Var(cris_trap_using_break8) Init(2)
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180 Emit traps as \"break 8\", default for CRIS v3 and up. If disabled, calls to abort() are used.
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181
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182 mtrap-unaligned-atomic
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183 Target Report Var(cris_trap_unaligned_atomic) Init(2)
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184 Emit checks causing \"break 8\" instructions to execute when applying atomic builtins on misaligned memory.
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185
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186 munaligned-atomic-may-use-library
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187 Target Report Var(cris_atomics_calling_libfunc) Init(2)
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188 Handle atomic builtins that may be applied to unaligned data by calling library functions. Overrides -mtrap-unaligned-atomic.
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189
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190 ; TARGET_SVINTO: Currently this just affects alignment. FIXME:
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191 ; Redundant with TARGET_ALIGN_BY_32, or put machine stuff here?
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192 ; This and the others below could just as well be variables and
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193 ; TARGET_* defines in cris.h.
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194 Mask(SVINTO)
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195
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196 ; TARGET_ALIGN_BY_32: Say that all alignment specifications say
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197 ; to prefer 32 rather than 16 bits.
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198 Mask(ALIGN_BY_32)
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199
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200 ; TARGET_AVOID_GOTPLT is referred to in the .c and the .md so we
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201 ; need to allocate the flag and macros here.
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202 Mask(AVOID_GOTPLT)
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