; Options for the MIPS port of the compiler ; ; Copyright (C) 2005-2018 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 ; . 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 Report Mask(ABICALLS) Generate code that can be used in SVR4-style dynamic objects. mmad Target Report Var(TARGET_MAD) Use PMC-style 'mad' instructions. mimadd Target Report 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 Report Mask(BRANCHLIKELY) Use Branch Likely instructions, overriding the architecture default. mflip-mips16 Target Report Var(TARGET_FLIP_MIPS16) Switch on/off MIPS16 ASE on alternating functions for compiler testing. mcheck-zero-division Target Report 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 Report RejectNegative Mask(DIVIDE_BREAKS) Use branch-and-break sequences to check for integer divide by zero. mdivide-traps Target Report RejectNegative InverseMask(DIVIDE_BREAKS, DIVIDE_TRAPS) Use trap instructions to check for integer divide by zero. mdmx Target Report RejectNegative Var(TARGET_MDMX) Allow the use of MDMX instructions. mdouble-float Target Report RejectNegative InverseMask(SINGLE_FLOAT, DOUBLE_FLOAT) Allow hardware floating-point instructions to cover both 32-bit and 64-bit operations. mdsp Target Report Var(TARGET_DSP) Use MIPS-DSP instructions. mdspr2 Target Report 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 Report RejectNegative Mask(BIG_ENDIAN) Use big-endian byte order. mel Target Report RejectNegative InverseMask(BIG_ENDIAN, LITTLE_ENDIAN) Use little-endian byte order. membedded-data Target Report Var(TARGET_EMBEDDED_DATA) Use ROM instead of RAM. meva Target Report Var(TARGET_EVA) Use Enhanced Virtual Addressing instructions. mexplicit-relocs Target Report Mask(EXPLICIT_RELOCS) Use NewABI-style %reloc() assembly operators. mextern-sdata Target Report Var(TARGET_EXTERN_SDATA) Init(1) Use -G for data that is not defined by the current object. mfix-24k Target Report Var(TARGET_FIX_24K) Work around certain 24K errata. mfix-r4000 Target Report Mask(FIX_R4000) Work around certain R4000 errata. mfix-r4400 Target Report Mask(FIX_R4400) Work around certain R4400 errata. mfix-rm7000 Target Report Var(TARGET_FIX_RM7000) Work around certain RM7000 errata. mfix-r10000 Target Report Mask(FIX_R10000) Work around certain R10000 errata. mfix-sb1 Target Report Var(TARGET_FIX_SB1) Work around errata for early SB-1 revision 2 cores. mfix-vr4120 Target Report Var(TARGET_FIX_VR4120) Work around certain VR4120 errata. mfix-vr4130 Target Report Var(TARGET_FIX_VR4130) Work around VR4130 mflo/mfhi errata. mfix4300 Target Report Var(TARGET_4300_MUL_FIX) Work around an early 4300 hardware bug. mfp-exceptions Target Report Var(TARGET_FP_EXCEPTIONS) Init(1) FP exceptions are enabled. mfp32 Target Report RejectNegative InverseMask(FLOAT64) Use 32-bit floating-point registers. mfpxx Target Report RejectNegative Mask(FLOATXX) Conform to the o32 FPXX ABI. mfp64 Target Report 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 Report RejectNegative InverseMask(64BIT) Use 32-bit general registers. mgp64 Target Report RejectNegative Mask(64BIT) Use 64-bit general registers. mgpopt Target Report Var(TARGET_GPOPT) Init(1) Use GP-relative addressing to access small data. mplt Target Report Var(TARGET_PLT) When generating -mabicalls code, allow executables to use PLTs and copy relocations. mhard-float Target Report RejectNegative InverseMask(SOFT_FLOAT_ABI, HARD_FLOAT_ABI) Allow the use of hardware floating-point ABI and instructions. minterlink-compressed Target Report Var(TARGET_INTERLINK_COMPRESSED) Init(0) Generate code that is link-compatible with MIPS16 and microMIPS code. minterlink-mips16 Target Report 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 Report RejectNegative Mask(MIPS16) Generate MIPS16 code. mips3d Target Report RejectNegative Var(TARGET_MIPS3D) Use MIPS-3D instructions. mllsc Target Report Mask(LLSC) Use ll, sc and sync instructions. mlocal-sdata Target Report Var(TARGET_LOCAL_SDATA) Init(1) Use -G for object-local data. mlong-calls Target Report Var(TARGET_LONG_CALLS) Use indirect calls. mlong32 Target Report RejectNegative InverseMask(LONG64, LONG32) Use a 32-bit long type. mlong64 Target Report RejectNegative Mask(LONG64) Use a 64-bit long type. mmcount-ra-address Target Report Var(TARGET_MCOUNT_RA_ADDRESS) Pass the address of the ra save location to _mcount in $12. mmemcpy Target Report Mask(MEMCPY) Don't optimize block moves. mmicromips Target Report Mask(MICROMIPS) Use microMIPS instructions. mmsa Target Report Var(TARGET_MSA) Use MIPS MSA Extension instructions. mmt Target Report Var(TARGET_MT) Allow the use of MT instructions. mno-float Target Report RejectNegative Var(TARGET_NO_FLOAT) Condition(TARGET_SUPPORTS_NO_FLOAT) Prevent the use of all floating-point operations. mmcu Target Report 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 Report RejectNegative Var(TARGET_MDMX, 0) Do not use MDMX instructions. mno-mips16 Target Report RejectNegative InverseMask(MIPS16) Generate normal-mode code. mno-mips3d Target Report RejectNegative Var(TARGET_MIPS3D, 0) Do not use MIPS-3D instructions. mpaired-single Target Report 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 Report Mask(RELAX_PIC_CALLS) Try to allow the linker to turn PIC calls into direct calls. mshared Target Report Var(TARGET_SHARED) Init(1) When generating -mabicalls code, make the code suitable for use in shared libraries. msingle-float Target Report RejectNegative Mask(SINGLE_FLOAT) Restrict the use of hardware floating-point instructions to 32-bit operations. msmartmips Target Report Mask(SMARTMIPS) Use SmartMIPS instructions. msoft-float Target Report RejectNegative Mask(SOFT_FLOAT_ABI) Prevent the use of all hardware floating-point instructions. msplit-addresses Target Report Mask(SPLIT_ADDRESSES) Optimize lui/addiu address loads. msym32 Target Report Var(TARGET_SYM32) Assume all symbols have 32-bit values. msynci Target Report Mask(SYNCI) Use synci instruction to invalidate i-cache. mlra Target Report Var(mips_lra_flag) Init(1) Save Use LRA instead of reload. mlxc1-sxc1 Target Report Var(mips_lxc1_sxc1) Init(1) Use lwxc1/swxc1/ldxc1/sdxc1 instructions where applicable. mmadd4 Target Report 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 Report Var(TARGET_UNINIT_CONST_IN_RODATA) Put uninitialized constants in ROM (needs -membedded-data). mvirt Target Report Var(TARGET_VIRT) Use Virtualization (VZ) instructions. mxpa Target Report Var(TARGET_XPA) Use eXtended Physical Address (XPA) instructions. mcrc Target Report Var(TARGET_CRC) Use Cyclic Redundancy Check (CRC) instructions. mginv Target Report Var(TARGET_GINV) Use Global INValidate (GINV) instructions. mvr4130-align Target Report Mask(VR4130_ALIGN) Perform VR4130-specific alignment optimizations. mxgot Target Report Var(TARGET_XGOT) Lift restrictions on GOT size. modd-spreg Target Report Mask(ODD_SPREG) Enable use of odd-numbered single-precision registers. mframe-header-opt Target Report Var(flag_frame_header_optimization) Optimization Optimize frame header. noasmopt Driver mload-store-pairs Target Report Var(TARGET_LOAD_STORE_PAIRS) Init(1) Enable load/store bonding. mcompact-branches= Target RejectNegative JoinedOrMissing Var(mips_cb) Report 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)