i386.opt

linux下编程用 编译软件

; Options for the IA-32 and AMD64 ports of the compiler.

; Copyright (C) 2005 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free
; Software Foundation; either version 2, or (at your option) any later
; version.
;
; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
; WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
; for more details.
;
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING.  If not, write to the Free
; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
; 02110-1301, USA.

m128bit-long-double
Target RejectNegative Report Mask(128BIT_LONG_DOUBLE)
sizeof(long double) is 16

m32
Target RejectNegative Report InverseMask(64BIT)
Generate 32bit i386 code

m386
Target RejectNegative Undocumented
;; Deprecated

m3dnow
Target Report Mask(3DNOW)
Support 3DNow! built-in functions

m486
Target RejectNegative Undocumented
;; Deprecated

m64
Target RejectNegative Report Mask(64BIT)
Generate 64bit x86-64 code

m80387
Target Report Mask(80387)
Use hardware fp

m96bit-long-double
Target RejectNegative Report InverseMask(128BIT_LONG_DOUBLE)
sizeof(long double) is 12

maccumulate-outgoing-args
Target Report Mask(ACCUMULATE_OUTGOING_ARGS)
Reserve space for outgoing arguments in the function prologue

malign-double
Target Report Mask(ALIGN_DOUBLE)
Align some doubles on dword boundary

malign-functions=
Target RejectNegative Joined Var(ix86_align_funcs_string)
Function starts are aligned to this power of 2

malign-jumps=
Target RejectNegative Joined Var(ix86_align_jumps_string)
Jump targets are aligned to this power of 2

malign-loops=
Target RejectNegative Joined Var(ix86_align_loops_string)
Loop code aligned to this power of 2

malign-stringops
Target RejectNegative Report InverseMask(NO_ALIGN_STRINGOPS, ALIGN_STRINGOPS)
Align destination of the string operations

march=
Target RejectNegative Joined Var(ix86_arch_string)
Generate code for given CPU

masm=
Target RejectNegative Joined Var(ix86_asm_string)
Use given assembler dialect

mbranch-cost=
Target RejectNegative Joined Var(ix86_branch_cost_string)
Branches are this expensive (1-5, arbitrary units)

mlarge-data-threshold=
Target RejectNegative Joined Var(ix86_section_threshold_string)
Data greater than given threshold will go into .ldata section in x86-64 medium model

mcmodel=
Target RejectNegative Joined Var(ix86_cmodel_string)
Use given x86-64 code model

mdebug-addr
Target RejectNegative Var(TARGET_DEBUG_ADDR) Undocumented

mdebug-arg
Target RejectNegative Var(TARGET_DEBUG_ARG) Undocumented

mfancy-math-387
Target RejectNegative Report InverseMask(NO_FANCY_MATH_387, USE_FANCY_MATH_387)
Generate sin, cos, sqrt for FPU

mfp-ret-in-387
Target Report Mask(FLOAT_RETURNS)
Return values of functions in FPU registers

mfpmath=
Target RejectNegative Joined Var(ix86_fpmath_string)
Generate floating point mathematics using given instruction set

mhard-float
Target RejectNegative Mask(80387) MaskExists
Use hardware fp

mieee-fp
Target Report Mask(IEEE_FP)
Use IEEE math for fp comparisons

minline-all-stringops
Target Report Mask(INLINE_ALL_STRINGOPS)
Inline all known string operations

mintel-syntax
Target Undocumented
;; Deprecated

mmmx
Target Report Mask(MMX)
Support MMX built-in functions

mms-bitfields
Target Report Mask(MS_BITFIELD_LAYOUT)
Use native (MS) bitfield layout

mno-align-stringops
Target RejectNegative Report Mask(NO_ALIGN_STRINGOPS) Undocumented

mno-fancy-math-387
Target RejectNegative Report Mask(NO_FANCY_MATH_387) Undocumented

mno-push-args
Target RejectNegative Report Mask(NO_PUSH_ARGS) Undocumented

mno-red-zone
Target RejectNegative Report Mask(NO_RED_ZONE) Undocumented

momit-leaf-frame-pointer
Target Report Mask(OMIT_LEAF_FRAME_POINTER)
Omit the frame pointer in leaf functions

mpentium
Target RejectNegative Undocumented
;; Deprecated

mpentiumpro
Target RejectNegative Undocumented
;; Deprecated

mpreferred-stack-boundary=
Target RejectNegative Joined Var(ix86_preferred_stack_boundary_string)
Attempt to keep stack aligned to this power of 2

mpush-args
Target Report InverseMask(NO_PUSH_ARGS, PUSH_ARGS)
Use push instructions to save outgoing arguments

mred-zone
Target RejectNegative Report InverseMask(NO_RED_ZONE, RED_ZONE)
Use red-zone in the x86-64 code

mregparm=
Target RejectNegative Joined Var(ix86_regparm_string)
Number of registers used to pass integer arguments

mrtd
Target Report Mask(RTD)
Alternate calling convention

msoft-float
Target InverseMask(80387)
Do not use hardware fp

msse
Target Report Mask(SSE)
Support MMX and SSE built-in functions and code generation

msse2
Target Report Mask(SSE2)
Support MMX, SSE and SSE2 built-in functions and code generation

msse3
Target Report Mask(SSE3)
Support MMX, SSE, SSE2 and SSE3 built-in functions and code generation

msseregparm
Target RejectNegative Mask(SSEREGPARM)
Use SSE register passing conventions for SF and DF mode

msvr3-shlib
Target Report Mask(SVR3_SHLIB)
Uninitialized locals in .bss

mstack-arg-probe
Target Report Mask(STACK_PROBE)
Enable stack probing

mtls-dialect=
Target RejectNegative Joined Var(ix86_tls_dialect_string)
Use given thread-local storage dialect

mtls-direct-seg-refs
Target Report Mask(TLS_DIRECT_SEG_REFS)
Use direct references against %gs when accessing tls data

mtune=
Target RejectNegative Joined Var(ix86_tune_string)
Schedule code for given CPU

;; Support Athlon 3Dnow builtins
Mask(3DNOW_A)