path: root/gcc/config/arm/arm.opt

; Options for the ARM port of the compiler.

; Copyright (C) 2005-2013 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/arm/arm-opts.h

Enum
Name(tls_type) Type(enum arm_tls_type)
TLS dialect to use:

EnumValue
Enum(tls_type) String(gnu) Value(TLS_GNU)

EnumValue
Enum(tls_type) String(gnu2) Value(TLS_GNU2)

mabi=
Target RejectNegative Joined Enum(arm_abi_type) Var(arm_abi) Init(ARM_DEFAULT_ABI)
Specify an ABI

Enum
Name(arm_abi_type) Type(enum arm_abi_type)
Known ARM ABIs (for use with the -mabi= option):

EnumValue
Enum(arm_abi_type) String(apcs-gnu) Value(ARM_ABI_APCS)

EnumValue
Enum(arm_abi_type) String(atpcs) Value(ARM_ABI_ATPCS)

EnumValue
Enum(arm_abi_type) String(aapcs) Value(ARM_ABI_AAPCS)

EnumValue
Enum(arm_abi_type) String(iwmmxt) Value(ARM_ABI_IWMMXT)

EnumValue
Enum(arm_abi_type) String(aapcs-linux) Value(ARM_ABI_AAPCS_LINUX)

mabort-on-noreturn
Target Report Mask(ABORT_NORETURN)
Generate a call to abort if a noreturn function returns

mapcs
Target RejectNegative Mask(APCS_FRAME) Undocumented

mapcs-float
Target Report Mask(APCS_FLOAT)
Pass FP arguments in FP registers

mapcs-frame
Target Report Mask(APCS_FRAME)
Generate APCS conformant stack frames

mapcs-reentrant
Target Report Mask(APCS_REENT)
Generate re-entrant, PIC code

mapcs-stack-check
Target Report Mask(APCS_STACK) Undocumented

march=
Target RejectNegative Joined Enum(arm_arch) Var(arm_arch_option)
Specify the name of the target architecture

; Other arm_arch values are loaded from arm-tables.opt
; but that is a generated file and this is an odd-one-out.
EnumValue
Enum(arm_arch) String(native) Value(-1) DriverOnly

marm
Target Report RejectNegative InverseMask(THUMB)
Generate code in 32 bit ARM state.

mbig-endian
Target Report RejectNegative Mask(BIG_END)
Assume target CPU is configured as big endian

mcallee-super-interworking
Target Report Mask(CALLEE_INTERWORKING)
Thumb: Assume non-static functions may be called from ARM code

mcaller-super-interworking
Target Report Mask(CALLER_INTERWORKING)
Thumb: Assume function pointers may go to non-Thumb aware code

mcpu=
Target RejectNegative Joined Enum(processor_type) Var(arm_cpu_option) Init(arm_none)
Specify the name of the target CPU

mfloat-abi=
Target RejectNegative Joined Enum(float_abi_type) Var(arm_float_abi) Init(TARGET_DEFAULT_FLOAT_ABI)
Specify if floating point hardware should be used

Enum
Name(float_abi_type) Type(enum float_abi_type)
Known floating-point ABIs (for use with the -mfloat-abi= option):

EnumValue
Enum(float_abi_type) String(soft) Value(ARM_FLOAT_ABI_SOFT)

EnumValue
Enum(float_abi_type) String(softfp) Value(ARM_FLOAT_ABI_SOFTFP)

EnumValue
Enum(float_abi_type) String(hard) Value(ARM_FLOAT_ABI_HARD)

mfp16-format=
Target RejectNegative Joined Enum(arm_fp16_format_type) Var(arm_fp16_format) Init(ARM_FP16_FORMAT_NONE)
Specify the __fp16 floating-point format

Enum
Name(arm_fp16_format_type) Type(enum arm_fp16_format_type)
Known __fp16 formats (for use with the -mfp16-format= option):

EnumValue
Enum(arm_fp16_format_type) String(none) Value(ARM_FP16_FORMAT_NONE)

EnumValue
Enum(arm_fp16_format_type) String(ieee) Value(ARM_FP16_FORMAT_IEEE)

EnumValue
Enum(arm_fp16_format_type) String(alternative) Value(ARM_FP16_FORMAT_ALTERNATIVE)

mfpu=
Target RejectNegative Joined Enum(arm_fpu) Var(arm_fpu_index)
Specify the name of the target floating point hardware/format

mlra
Target Report Var(arm_lra_flag) Init(1) Save
Use LRA instead of reload (transitional)

mhard-float
Target RejectNegative Alias(mfloat-abi=, hard) Undocumented

mlittle-endian
Target Report RejectNegative InverseMask(BIG_END)
Assume target CPU is configured as little endian

mlong-calls
Target Report Mask(LONG_CALLS)
Generate call insns as indirect calls, if necessary

mpic-data-is-text-relative
Target Report Var(arm_pic_data_is_text_relative) Init(TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE)
Assume data segments are relative to text segment.

mpic-register=
Target RejectNegative Joined Var(arm_pic_register_string)
Specify the register to be used for PIC addressing

mpoke-function-name
Target Report Mask(POKE_FUNCTION_NAME)
Store function names in object code

msched-prolog
Target Report Mask(SCHED_PROLOG)
Permit scheduling of a function's prologue sequence

msingle-pic-base
Target Report Mask(SINGLE_PIC_BASE)
Do not load the PIC register in function prologues

msoft-float
Target RejectNegative Alias(mfloat-abi=, soft) Undocumented

mstructure-size-boundary=
Target RejectNegative Joined UInteger Var(arm_structure_size_boundary) Init(DEFAULT_STRUCTURE_SIZE_BOUNDARY)
Specify the minimum bit alignment of structures

mthumb
Target Report RejectNegative Mask(THUMB)
Generate code for Thumb state

mthumb-interwork
Target Report Mask(INTERWORK)
Support calls between Thumb and ARM instruction sets

mtls-dialect=
Target RejectNegative Joined Enum(tls_type) Var(target_tls_dialect) Init(TLS_GNU)
Specify thread local storage scheme

mtp=
Target RejectNegative Joined Enum(arm_tp_type) Var(target_thread_pointer) Init(TP_AUTO)
Specify how to access the thread pointer

Enum
Name(arm_tp_type) Type(enum arm_tp_type)
Valid arguments to -mtp=:

EnumValue
Enum(arm_tp_type) String(soft) Value(TP_SOFT)

EnumValue
Enum(arm_tp_type) String(auto) Value(TP_AUTO)

EnumValue
Enum(arm_tp_type) String(cp15) Value(TP_CP15)

mtpcs-frame
Target Report Mask(TPCS_FRAME)
Thumb: Generate (non-leaf) stack frames even if not needed

mtpcs-leaf-frame
Target Report Mask(TPCS_LEAF_FRAME)
Thumb: Generate (leaf) stack frames even if not needed

mtune=
Target RejectNegative Joined Enum(processor_type) Var(arm_tune_option) Init(arm_none)
Tune code for the given processor

; Other processor_type values are loaded from arm-tables.opt
; but that is a generated file and this is an odd-one-out.
EnumValue
Enum(processor_type) String(native) Value(-1) DriverOnly

mwords-little-endian
Target Report RejectNegative Mask(LITTLE_WORDS)
Assume big endian bytes, little endian words.  This option is deprecated.

mvectorize-with-neon-quad
Target Report RejectNegative InverseMask(NEON_VECTORIZE_DOUBLE)
Use Neon quad-word (rather than double-word) registers for vectorization

mvectorize-with-neon-double
Target Report RejectNegative Mask(NEON_VECTORIZE_DOUBLE)
Use Neon double-word (rather than quad-word) registers for vectorization

mword-relocations
Target Report Var(target_word_relocations) Init(TARGET_DEFAULT_WORD_RELOCATIONS)
Only generate absolute relocations on word sized values.

mrestrict-it
Target Report Var(arm_restrict_it) Init(2)
Generate IT blocks appropriate for ARMv8.

mold-rtx-costs
Target Report Mask(OLD_RTX_COSTS)
Use the old RTX costing tables (transitional).

mnew-generic-costs
Target Report Mask(NEW_GENERIC_COSTS)
Use the new generic RTX cost tables if new core-specific cost table not available (transitional).

mfix-cortex-m3-ldrd
Target Report Var(fix_cm3_ldrd) Init(2)
Avoid overlapping destination and address registers on LDRD instructions
that may trigger Cortex-M3 errata.

munaligned-access
Target Report Var(unaligned_access) Init(2)
Enable unaligned word and halfword accesses to packed data.

mneon-for-64bits
Target Report RejectNegative Var(use_neon_for_64bits) Init(0)
Use Neon to perform 64-bits operations rather than core registers.

mslow-flash-data
Target Report Var(target_slow_flash_data) Init(0)
Assume loading data from flash is slower than fetching instructions.