gcc/config/mips/mips.opt

; Options for the MIPS port of the compiler
;
; Copyright (C) 2005-2021 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 3, 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 COPYING3.  If not see
; <http://www.gnu.org/licenses/>.

HeaderInclude
config/mips/mips-opts.h

EB
Driver

EL
Driver

mabi=
Target RejectNegative Joined Enum(mips_abi) Var(mips_abi) Init(MIPS_ABI_DEFAULT)
-mabi=ABI	Generate code that conforms to the given ABI.

Enum
Name(mips_abi) Type(int)
Known MIPS ABIs (for use with the -mabi= option):

EnumValue
Enum(mips_abi) String(32) Value(ABI_32)

EnumValue
Enum(mips_abi) String(o64) Value(ABI_O64)

EnumValue
Enum(mips_abi) String(n32) Value(ABI_N32)

EnumValue
Enum(mips_abi) String(64) Value(ABI_64)

EnumValue
Enum(mips_abi) String(eabi) Value(ABI_EABI)

mabicalls
Target Mask(ABICALLS)
Generate code that can be used in SVR4-style dynamic objects.

mmad
Target Var(TARGET_MAD)
Use PMC-style 'mad' instructions.

mimadd
Target Mask(IMADD)
Use integer madd/msub instructions.

march=
Target RejectNegative Joined Var(mips_arch_option) ToLower Enum(mips_arch_opt_value)
-march=ISA	Generate code for the given ISA.

mbranch-cost=
Target RejectNegative Joined UInteger Var(mips_branch_cost)
-mbranch-cost=COST	Set the cost of branches to roughly COST instructions.

mbranch-likely
Target Mask(BRANCHLIKELY)
Use Branch Likely instructions, overriding the architecture default.

mflip-mips16
Target Var(TARGET_FLIP_MIPS16)
Switch on/off MIPS16 ASE on alternating functions for compiler testing.

mcheck-zero-division
Target Mask(CHECK_ZERO_DIV)
Trap on integer divide by zero.

mcode-readable=
Target RejectNegative Joined Enum(mips_code_readable_setting) Var(mips_code_readable) Init(CODE_READABLE_YES)
-mcode-readable=SETTING	Specify when instructions are allowed to access code.

Enum
Name(mips_code_readable_setting) Type(enum mips_code_readable_setting)
Valid arguments to -mcode-readable=:

EnumValue
Enum(mips_code_readable_setting) String(yes) Value(CODE_READABLE_YES)

EnumValue
Enum(mips_code_readable_setting) String(pcrel) Value(CODE_READABLE_PCREL)

EnumValue
Enum(mips_code_readable_setting) String(no) Value(CODE_READABLE_NO)

mdivide-breaks
Target RejectNegative Mask(DIVIDE_BREAKS)
Use branch-and-break sequences to check for integer divide by zero.

mdivide-traps
Target RejectNegative InverseMask(DIVIDE_BREAKS, DIVIDE_TRAPS)
Use trap instructions to check for integer divide by zero.

mdmx
Target RejectNegative Var(TARGET_MDMX)
Allow the use of MDMX instructions.

mdouble-float
Target RejectNegative InverseMask(SINGLE_FLOAT, DOUBLE_FLOAT)
Allow hardware floating-point instructions to cover both 32-bit and 64-bit operations.

mdsp
Target Var(TARGET_DSP)
Use MIPS-DSP instructions.

mdspr2
Target Var(TARGET_DSPR2)
Use MIPS-DSP REV 2 instructions.

mdebug
Target Var(TARGET_DEBUG_MODE) Undocumented

mdebugd
Target Var(TARGET_DEBUG_D_MODE) Undocumented

meb
Target RejectNegative Mask(BIG_ENDIAN)
Use big-endian byte order.

mel
Target RejectNegative InverseMask(BIG_ENDIAN, LITTLE_ENDIAN)
Use little-endian byte order.

membedded-data
Target Var(TARGET_EMBEDDED_DATA)
Use ROM instead of RAM.

meva
Target Var(TARGET_EVA)
Use Enhanced Virtual Addressing instructions.

mexplicit-relocs
Target Mask(EXPLICIT_RELOCS)
Use NewABI-style %reloc() assembly operators.

mextern-sdata
Target Var(TARGET_EXTERN_SDATA) Init(1)
Use -G for data that is not defined by the current object.

mfix-24k
Target Var(TARGET_FIX_24K)
Work around certain 24K errata.

mfix-r4000
Target Mask(FIX_R4000)
Work around certain R4000 errata.

mfix-r4400
Target Mask(FIX_R4400)
Work around certain R4400 errata.

mfix-r5900
Target Mask(FIX_R5900)
Work around the R5900 short loop erratum.

mfix-rm7000
Target Var(TARGET_FIX_RM7000)
Work around certain RM7000 errata.

mfix-r10000
Target Mask(FIX_R10000)
Work around certain R10000 errata.

mfix-sb1
Target Var(TARGET_FIX_SB1)
Work around errata for early SB-1 revision 2 cores.

mfix-vr4120
Target Var(TARGET_FIX_VR4120)
Work around certain VR4120 errata.

mfix-vr4130
Target Var(TARGET_FIX_VR4130)
Work around VR4130 mflo/mfhi errata.

mfix4300
Target Var(TARGET_4300_MUL_FIX)
Work around an early 4300 hardware bug.

mfp-exceptions
Target Var(TARGET_FP_EXCEPTIONS) Init(1)
FP exceptions are enabled.

mfp32
Target RejectNegative InverseMask(FLOAT64)
Use 32-bit floating-point registers.

mfpxx
Target RejectNegative Mask(FLOATXX)
Conform to the o32 FPXX ABI.

mfp64
Target RejectNegative Mask(FLOAT64)
Use 64-bit floating-point registers.

mflush-func=
Target RejectNegative Joined Var(mips_cache_flush_func) Init(CACHE_FLUSH_FUNC)
-mflush-func=FUNC	Use FUNC to flush the cache before calling stack trampolines.

mabs=
Target RejectNegative Joined Enum(mips_ieee_754_value) Var(mips_abs) Init(MIPS_IEEE_754_DEFAULT)
-mabs=MODE	Select the IEEE 754 ABS/NEG instruction execution mode.

mnan=
Target RejectNegative Joined Enum(mips_ieee_754_value) Var(mips_nan) Init(MIPS_IEEE_754_DEFAULT)
-mnan=ENCODING	Select the IEEE 754 NaN data encoding.

Enum
Name(mips_ieee_754_value) Type(int)
Known MIPS IEEE 754 settings (for use with the -mabs= and -mnan= options):

EnumValue
Enum(mips_ieee_754_value) String(2008) Value(MIPS_IEEE_754_2008)

EnumValue
Enum(mips_ieee_754_value) String(legacy) Value(MIPS_IEEE_754_LEGACY)

mgp32
Target RejectNegative InverseMask(64BIT)
Use 32-bit general registers.

mgp64
Target RejectNegative Mask(64BIT)
Use 64-bit general registers.

mgpopt
Target Var(TARGET_GPOPT) Init(1)
Use GP-relative addressing to access small data.

mplt
Target Var(TARGET_PLT)
When generating -mabicalls code, allow executables to use PLTs and copy relocations.

mhard-float
Target RejectNegative InverseMask(SOFT_FLOAT_ABI, HARD_FLOAT_ABI)
Allow the use of hardware floating-point ABI and instructions.

minterlink-compressed
Target Var(TARGET_INTERLINK_COMPRESSED) Init(0)
Generate code that is link-compatible with MIPS16 and microMIPS code.

minterlink-mips16
Target Var(TARGET_INTERLINK_COMPRESSED) Init(0)
An alias for minterlink-compressed provided for backward-compatibility.

mips
Target RejectNegative Joined ToLower Enum(mips_mips_opt_value) Var(mips_isa_option)
-mipsN	Generate code for ISA level N.

mips16
Target RejectNegative Mask(MIPS16)
Generate MIPS16 code.

mips3d
Target RejectNegative Var(TARGET_MIPS3D)
Use MIPS-3D instructions.

mllsc
Target Mask(LLSC)
Use ll, sc and sync instructions.

mlocal-sdata
Target Var(TARGET_LOCAL_SDATA) Init(1)
Use -G for object-local data.

mlong-calls
Target Var(TARGET_LONG_CALLS)
Use indirect calls.

mlong32
Target RejectNegative InverseMask(LONG64, LONG32)
Use a 32-bit long type.

mlong64
Target RejectNegative Mask(LONG64)
Use a 64-bit long type.

mmcount-ra-address
Target Var(TARGET_MCOUNT_RA_ADDRESS)
Pass the address of the ra save location to _mcount in $12.

mmemcpy
Target Mask(MEMCPY)
Don't optimize block moves.

mmicromips
Target Mask(MICROMIPS)
Use microMIPS instructions.

mmsa
Target Mask(MSA)
Use MIPS MSA Extension instructions.

mmt
Target Var(TARGET_MT)
Allow the use of MT instructions.

mno-float
Target RejectNegative Var(TARGET_NO_FLOAT) Condition(TARGET_SUPPORTS_NO_FLOAT)
Prevent the use of all floating-point operations.

mmcu
Target Var(TARGET_MCU)
Use MCU instructions.

mno-flush-func
Target RejectNegative
Do not use a cache-flushing function before calling stack trampolines.

mno-mdmx
Target RejectNegative Var(TARGET_MDMX, 0)
Do not use MDMX instructions.

mno-mips16
Target RejectNegative InverseMask(MIPS16)
Generate normal-mode code.

mno-mips3d
Target RejectNegative Var(TARGET_MIPS3D, 0)
Do not use MIPS-3D instructions.

mpaired-single
Target Mask(PAIRED_SINGLE_FLOAT)
Use paired-single floating-point instructions.

mr10k-cache-barrier=
Target Joined RejectNegative Enum(mips_r10k_cache_barrier_setting) Var(mips_r10k_cache_barrier) Init(R10K_CACHE_BARRIER_NONE)
-mr10k-cache-barrier=SETTING	Specify when r10k cache barriers should be inserted.

Enum
Name(mips_r10k_cache_barrier_setting) Type(enum mips_r10k_cache_barrier_setting)
Valid arguments to -mr10k-cache-barrier=:

EnumValue
Enum(mips_r10k_cache_barrier_setting) String(load-store) Value(R10K_CACHE_BARRIER_LOAD_STORE)

EnumValue
Enum(mips_r10k_cache_barrier_setting) String(store) Value(R10K_CACHE_BARRIER_STORE)

EnumValue
Enum(mips_r10k_cache_barrier_setting) String(none) Value(R10K_CACHE_BARRIER_NONE)

mrelax-pic-calls
Target Mask(RELAX_PIC_CALLS)
Try to allow the linker to turn PIC calls into direct calls.

mshared
Target Var(TARGET_SHARED) Init(1)
When generating -mabicalls code, make the code suitable for use in shared libraries.

msingle-float
Target RejectNegative Mask(SINGLE_FLOAT)
Restrict the use of hardware floating-point instructions to 32-bit operations.

msmartmips
Target Mask(SMARTMIPS)
Use SmartMIPS instructions.

msoft-float
Target RejectNegative Mask(SOFT_FLOAT_ABI)
Prevent the use of all hardware floating-point instructions.

msplit-addresses
Target Mask(SPLIT_ADDRESSES)
Optimize lui/addiu address loads.

msym32
Target Var(TARGET_SYM32)
Assume all symbols have 32-bit values.

msynci
Target Mask(SYNCI)
Use synci instruction to invalidate i-cache.

mlra
Target Var(mips_lra_flag) Init(1) Save
Use LRA instead of reload.

mlxc1-sxc1
Target Var(mips_lxc1_sxc1) Init(1)
Use lwxc1/swxc1/ldxc1/sdxc1 instructions where applicable.

mmadd4
Target Var(mips_madd4) Init(1)
Use 4-operand madd.s/madd.d and related instructions where applicable.

mtune=
Target RejectNegative Joined Var(mips_tune_option) ToLower Enum(mips_arch_opt_value)
-mtune=PROCESSOR	Optimize the output for PROCESSOR.

muninit-const-in-rodata
Target Var(TARGET_UNINIT_CONST_IN_RODATA)
Put uninitialized constants in ROM (needs -membedded-data).

mvirt
Target Var(TARGET_VIRT)
Use Virtualization (VZ) instructions.

mxpa
Target Var(TARGET_XPA)
Use eXtended Physical Address (XPA) instructions.

mcrc
Target Var(TARGET_CRC)
Use Cyclic Redundancy Check (CRC) instructions.

mginv
Target Var(TARGET_GINV)
Use Global INValidate (GINV) instructions.

mvr4130-align
Target Mask(VR4130_ALIGN)
Perform VR4130-specific alignment optimizations.

mxgot
Target Var(TARGET_XGOT)
Lift restrictions on GOT size.

modd-spreg
Target Mask(ODD_SPREG)
Enable use of odd-numbered single-precision registers.

mframe-header-opt
Target Var(flag_frame_header_optimization) Optimization
Optimize frame header.

noasmopt
Driver

mload-store-pairs
Target Var(TARGET_LOAD_STORE_PAIRS) Init(1)
Enable load/store bonding.

mcompact-branches=
Target RejectNegative JoinedOrMissing Var(mips_cb) Enum(mips_cb_setting) Init(MIPS_CB_OPTIMAL)
Specify the compact branch usage policy.

Enum
Name(mips_cb_setting) Type(enum mips_cb_setting)
Policies available for use with -mcompact-branches=:

EnumValue
Enum(mips_cb_setting) String(never) Value(MIPS_CB_NEVER)

EnumValue
Enum(mips_cb_setting) String(optimal) Value(MIPS_CB_OPTIMAL)

EnumValue
Enum(mips_cb_setting) String(always) Value(MIPS_CB_ALWAYS)

mloongson-mmi
Target Mask(LOONGSON_MMI)
Use Loongson MultiMedia extensions Instructions (MMI) instructions.

mloongson-ext
Target Mask(LOONGSON_EXT)
Use Loongson EXTension (EXT) instructions.

mloongson-ext2
Target Var(TARGET_LOONGSON_EXT2)
Use Loongson EXTension R2 (EXT2) instructions.