gcc/config/cris/cris.opt

   1 ; Options for the CRIS port of the compiler.
   2
   3 ; Copyright (C) 2005-2019 Free Software Foundation, Inc.
   4 ;
   5 ; This file is part of GCC.
   6 ;
   7 ; GCC is free software; you can redistribute it and/or modify it under
   8 ; the terms of the GNU General Public License as published by the Free
   9 ; Software Foundation; either version 3, or (at your option) any later
  10 ; version.
  11 ;
  12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 ; 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 ; TARGET_MUL_BUG: Whether or not to work around multiplication
  22 ; instruction hardware bug when generating code for models where
  23 ; it may be present.  From the trouble report for Etrax 100 LX:
  24 ; "A multiply operation may cause incorrect cache behavior
  25 ; under some specific circumstances. The problem can occur if
  26 ; the instruction following the multiply instruction causes a
  27 ; cache miss, and multiply operand 1 (source operand) bits
  28 ; [31:27] matches the logical mapping of the mode register
  29 ; address (0xb0....), and bits [9:2] of operand 1 matches the
  30 ; TLB register address (0x258-0x25f).  There is such a mapping
  31 ; in kernel mode or when the MMU is off.  Normally there is no
  32 ; such mapping in user mode, and the problem will therefore
  33 ; probably not occur in Linux user mode programs."
  34 ;
  35 ; We have no sure-fire way to know from within GCC that we're
  36 ; compiling a user program.  For example, -fpic/PIC is used in
  37 ; libgcc which is linked into the kernel.  However, the
  38 ; workaround option -mno-mul-bug can be safely used per-package
  39 ; when compiling programs.  The same goes for general user-only
  40 ; libraries such as glibc, since there's no user-space
  41 ; driver-like program that gets a mapping of I/O registers (all
  42 ; on the same page, including the TLB registers).
  43 mmul-bug-workaround
  44 Target Report Mask(MUL_BUG)
  45 Work around bug in multiplication instruction.
  46
  47 ; TARGET_ETRAX4_ADD: Instruction-set additions from Etrax 4 and up.
  48 ; (Just "lz".)
  49 metrax4
  50 Target Report Mask(ETRAX4_ADD)
  51 Compile for ETRAX 4 (CRIS v3).
  52
  53 ; See cris_handle_option.
  54 metrax100
  55 Target Report RejectNegative
  56 Compile for ETRAX 100 (CRIS v8).
  57
  58 ; See cris_handle_option.
  59 mno-etrax100
  60 Target Report RejectNegative Undocumented
  61
  62 mpdebug
  63 Target Report Mask(PDEBUG)
  64 Emit verbose debug information in assembly code.
  65
  66 ; TARGET_CCINIT: Whether to use condition-codes generated by
  67 ; insns other than the immediately preceding compare/test insn.
  68 ; Used to check for errors in notice_update_cc.
  69 mcc-init
  70 Target Report Mask(CCINIT)
  71 Do not use condition codes from normal instructions.
  72
  73 ; TARGET_SIDE_EFFECT_PREFIXES: Whether to use side-effect
  74 ; patterns.  Used to debug the [rx=ry+i] type patterns.
  75 mside-effects
  76 Target Report RejectNegative Mask(SIDE_EFFECT_PREFIXES) Undocumented
  77
  78 mno-side-effects
  79 Target Report RejectNegative InverseMask(SIDE_EFFECT_PREFIXES)
  80 Do not emit addressing modes with side-effect assignment.
  81
  82 ; TARGET_STACK_ALIGN: Whether to *keep* (not force) alignment of
  83 ; stack at 16 (or 32, depending on TARGET_ALIGN_BY_32) bits.
  84 mstack-align
  85 Target Report RejectNegative Mask(STACK_ALIGN) Undocumented
  86
  87 mno-stack-align
  88 Target Report RejectNegative InverseMask(STACK_ALIGN)
  89 Do not tune stack alignment.
  90
  91 ; TARGET_DATA_ALIGN: Whether to do alignment on individual
  92 ; modifiable objects.
  93 mdata-align
  94 Target Report RejectNegative Mask(DATA_ALIGN) Undocumented
  95
  96 mno-data-align
  97 Target Report RejectNegative InverseMask(DATA_ALIGN)
  98 Do not tune writable data alignment.
  99
 100 ; TARGET_CONST_ALIGN: Whether to do alignment on individual
 101 ; non-modifiable objects.
 102 mconst-align
 103 Target Report RejectNegative Mask(CONST_ALIGN) Undocumented
 104
 105 mno-const-align
 106 Target Report RejectNegative InverseMask(CONST_ALIGN)
 107 Do not tune code and read-only data alignment.
 108
 109 ; See cris_handle_option.
 110 m32-bit
 111 Target Report RejectNegative Undocumented
 112
 113 ; See cris_handle_option.
 114 m32bit
 115 Target Report RejectNegative
 116 Align code and data to 32 bits.
 117
 118 ; See cris_handle_option.
 119 m16-bit
 120 Target Report RejectNegative Undocumented
 121
 122 ; See cris_handle_option.
 123 m16bit
 124 Target Report RejectNegative Undocumented
 125
 126 ; See cris_handle_option.
 127 m8-bit
 128 Target Report RejectNegative Undocumented
 129
 130 ; See cris_handle_option.
 131 m8bit
 132 Target Report RejectNegative
 133 Don't align items in code or data.
 134
 135 ; TARGET_PROLOGUE_EPILOGUE: Whether or not to omit function
 136 ; prologue and epilogue.
 137 mprologue-epilogue
 138 Target Report RejectNegative Mask(PROLOGUE_EPILOGUE) Undocumented
 139
 140 mno-prologue-epilogue
 141 Target Report RejectNegative InverseMask(PROLOGUE_EPILOGUE)
 142 Do not emit function prologue or epilogue.
 143
 144 ; We have to handle this m-option here since we can't wash it
 145 ; off in both CC1_SPEC and CC1PLUS_SPEC.
 146
 147 mbest-lib-options
 148 Target Report RejectNegative
 149 Use the most feature-enabling options allowed by other options.
 150
 151 ; FIXME: The following comment relates to gcc before cris.opt.
 152 ; Check if it's still valid:
 153 ; We must call it "override-" since calling it "no-" will cause
 154 ; gcc.c to forget it, if there's a "later" -mbest-lib-options.
 155 ; Kludgy, but needed for some multilibbed files.
 156 moverride-best-lib-options
 157 Target Report RejectNegative
 158 Override -mbest-lib-options.
 159
 160 mcpu=
 161 Target Report RejectNegative Joined Undocumented Var(cris_cpu_str)
 162
 163 march=
 164 Target Report RejectNegative Joined Var(cris_cpu_str)
 165 -march=ARCH     Generate code for the specified chip or CPU version.
 166
 167 mtune=
 168 Target Report RejectNegative Joined Var(cris_tune_str)
 169 -mtune=ARCH     Tune alignment for the specified chip or CPU version.
 170
 171 mmax-stackframe=
 172 Target Report RejectNegative Joined Var(cris_max_stackframe_str)
 173 -mmax-stackframe=SIZE   Warn when a stackframe is larger than the specified size.
 174
 175 max-stackframe=
 176 Target Report RejectNegative Joined Undocumented Var(cris_max_stackframe_str)
 177
 178 mtrap-using-break8
 179 Target Report Var(cris_trap_using_break8) Init(2)
 180 Emit traps as \"break 8\", default for CRIS v3 and up.  If disabled, calls to abort() are used.
 181
 182 mtrap-unaligned-atomic
 183 Target Report Var(cris_trap_unaligned_atomic) Init(2)
 184 Emit checks causing \"break 8\" instructions to execute when applying atomic builtins on misaligned memory.
 185
 186 munaligned-atomic-may-use-library
 187 Target Report Var(cris_atomics_calling_libfunc) Init(2)
 188 Handle atomic builtins that may be applied to unaligned data by calling library functions. Overrides -mtrap-unaligned-atomic.
 189
 190 ; TARGET_SVINTO: Currently this just affects alignment.  FIXME:
 191 ; Redundant with TARGET_ALIGN_BY_32, or put machine stuff here?
 192 ; This and the others below could just as well be variables and
 193 ; TARGET_* defines in cris.h.
 194 Mask(SVINTO)
 195
 196 ; TARGET_ALIGN_BY_32: Say that all alignment specifications say
 197 ; to prefer 32 rather than 16 bits.
 198 Mask(ALIGN_BY_32)
 199
 200 ; TARGET_AVOID_GOTPLT is referred to in the .c and the .md so we
 201 ; need to allocate the flag and macros here.
 202 Mask(AVOID_GOTPLT)