path: root/gcc/config/rs6000/rs6000.opt

; Options for the rs6000 port of the compiler
;
; Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software
; Foundation, Inc.
; Contributed by Aldy Hernandez <aldy@quesejoda.com>.
;
; 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/rs6000/rs6000-opts.h

;; Current processor
TargetVariable
enum processor_type rs6000_cpu = PROCESSOR_RIOS1

;; Always emit branch hint bits.
TargetVariable
unsigned char rs6000_always_hint

;; Schedule instructions for group formation.
TargetVariable
unsigned char rs6000_sched_groups

;; Align branch targets.
TargetVariable
unsigned char rs6000_align_branch_targets

;; Support for -msched-costly-dep option.
TargetVariable
enum rs6000_dependence_cost rs6000_sched_costly_dep = no_dep_costly

;; Support for -minsert-sched-nops option.
TargetVariable
enum rs6000_nop_insertion rs6000_sched_insert_nops = sched_finish_none

;; Size of long double.
TargetVariable
unsigned char rs6000_long_double_type_size

;; IEEE quad extended precision long double.
TargetVariable
unsigned char rs6000_ieeequad

;; Nonzero to use AltiVec ABI.
TargetVariable
unsigned char rs6000_altivec_abi

;; Nonzero if we want SPE SIMD instructions.
TargetVariable
int rs6000_spe

;; Nonzero if we want SPE ABI extensions.
TargetVariable
unsigned char rs6000_spe_abi

;; Nonzero if floating point operations are done in the GPRs.
TargetVariable
unsigned char rs6000_float_gprs

;; Nonzero if we want Darwin's struct-by-value-in-regs ABI.
TargetVariable
unsigned char rs6000_darwin64_abi

;; Non-zero to allow overriding loop alignment.
TargetVariable
unsigned char can_override_loop_align

;; Which small data model to use (for System V targets only)
TargetVariable
enum rs6000_sdata_type rs6000_sdata = SDATA_DATA

;; Bit size of immediate TLS offsets and string from which it is decoded.
TargetVariable
int rs6000_tls_size = 32

;; ABI enumeration available for subtarget to use.
TargetVariable
enum rs6000_abi rs6000_current_abi = ABI_NONE

;; Type of traceback to use.
TargetVariable
enum rs6000_traceback_type rs6000_traceback = traceback_default

;; Control alignment for fields within structures.
TargetVariable
unsigned char rs6000_alignment_flags

;; Code model for 64-bit linux.
TargetVariable
enum rs6000_cmodel rs6000_current_cmodel = CMODEL_SMALL

;; What type of reciprocal estimation instructions to generate
TargetVariable
unsigned int rs6000_recip_control

;; -mcpu=<xxx> as an index into the processor_target_table or -1
TargetVariable
int rs6000_cpu_index = -1

;; -mtune=<xxx> as an index into the processor_target_table or -1
TargetVariable
int rs6000_tune_index = -1

;; Debug flags
TargetVariable
unsigned int rs6000_debug

;; Save for target_flags_explicit
TargetSave
int rs6000_target_flags_explicit

mpower
Target Report RejectNegative Mask(POWER)
Use POWER instruction set

mno-power
Target Report RejectNegative
Do not use POWER instruction set

mpower2
Target Report Mask(POWER2)
Use POWER2 instruction set

mpowerpc
Target Report RejectNegative Mask(POWERPC)
Use PowerPC instruction set

mno-powerpc
Target Report RejectNegative
Do not use PowerPC instruction set

mpowerpc64
Target Report Mask(POWERPC64)
Use PowerPC-64 instruction set

mpowerpc-gpopt
Target Report Mask(PPC_GPOPT) Save
Use PowerPC General Purpose group optional instructions

mpowerpc-gfxopt
Target Report Mask(PPC_GFXOPT) Save
Use PowerPC Graphics group optional instructions

mmfcrf
Target Report Mask(MFCRF) Save
Use PowerPC V2.01 single field mfcr instruction

mpopcntb
Target Report Mask(POPCNTB) Save
Use PowerPC V2.02 popcntb instruction

mfprnd
Target Report Mask(FPRND) Save
Use PowerPC V2.02 floating point rounding instructions

mcmpb
Target Report Mask(CMPB) Save
Use PowerPC V2.05 compare bytes instruction

mmfpgpr
Target Report Mask(MFPGPR) Save
Use extended PowerPC V2.05 move floating point to/from GPR instructions

maltivec
Target Report Mask(ALTIVEC) Save
Use AltiVec instructions

mhard-dfp
Target Report Mask(DFP) Save
Use decimal floating point instructions

mmulhw
Target Report Mask(MULHW) Save
Use 4xx half-word multiply instructions

mdlmzb
Target Report Mask(DLMZB) Save
Use 4xx string-search dlmzb instruction

mmultiple
Target Report Mask(MULTIPLE) Save
Generate load/store multiple instructions

mstring
Target Report Mask(STRING) Save
Generate string instructions for block moves

mnew-mnemonics
Target Report RejectNegative Mask(NEW_MNEMONICS)
Use new mnemonics for PowerPC architecture

mold-mnemonics
Target Report RejectNegative InverseMask(NEW_MNEMONICS)
Use old mnemonics for PowerPC architecture

msoft-float
Target Report RejectNegative Mask(SOFT_FLOAT)
Do not use hardware floating point

mhard-float
Target Report RejectNegative InverseMask(SOFT_FLOAT, HARD_FLOAT)
Use hardware floating point

mpopcntd
Target Report Mask(POPCNTD) Save
Use PowerPC V2.06 popcntd instruction

mfriz
Target Report Var(TARGET_FRIZ) Init(-1) Save
Under -ffast-math, generate a FRIZ instruction for (double)(long long) conversions

mveclibabi=
Target RejectNegative Joined Var(rs6000_veclibabi_name)
Vector library ABI to use

mvsx
Target Report Mask(VSX) Save
Use vector/scalar (VSX) instructions

mvsx-scalar-double
Target Undocumented Report Var(TARGET_VSX_SCALAR_DOUBLE) Init(-1)
; If -mvsx, use VSX arithmetic instructions for scalar double (on by default)

mvsx-scalar-memory
Target Undocumented Report Var(TARGET_VSX_SCALAR_MEMORY)
; If -mvsx, use VSX scalar memory reference instructions for scalar double (off by default)

mvsx-align-128
Target Undocumented Report Var(TARGET_VSX_ALIGN_128)
; If -mvsx, set alignment to 128 bits instead of 32/64

mallow-movmisalign
Target Undocumented Var(TARGET_ALLOW_MOVMISALIGN) Init(-1)
; Allow/disallow the movmisalign in DF/DI vectors

mallow-df-permute
Target Undocumented Var(TARGET_ALLOW_DF_PERMUTE)
; Allow/disallow permutation of DF/DI vectors

msched-groups
Target Undocumented Report Var(TARGET_SCHED_GROUPS) Init(-1)
; Explicitly set/unset whether rs6000_sched_groups is set

malways-hint
Target Undocumented Report Var(TARGET_ALWAYS_HINT) Init(-1)
; Explicitly set/unset whether rs6000_always_hint is set

malign-branch-targets
Target Undocumented Report Var(TARGET_ALIGN_BRANCH_TARGETS) Init(-1)
; Explicitly set/unset whether rs6000_align_branch_targets is set

mvectorize-builtins
Target Undocumented Report Var(TARGET_VECTORIZE_BUILTINS) Init(-1)
; Explicitly control whether we vectorize the builtins or not.

mno-update
Target Report RejectNegative Mask(NO_UPDATE) Save
Do not generate load/store with update instructions

mupdate
Target Report RejectNegative InverseMask(NO_UPDATE, UPDATE)
Generate load/store with update instructions

msingle-pic-base
Target Report Var(TARGET_SINGLE_PIC_BASE) Init(0)
Do not load the PIC register in function prologues

mavoid-indexed-addresses
Target Report Var(TARGET_AVOID_XFORM) Init(-1) Save
Avoid generation of indexed load/store instructions when possible

mtls-markers
Target Report Var(tls_markers) Init(1) Save
Mark __tls_get_addr calls with argument info

msched-epilog
Target Undocumented Var(TARGET_SCHED_PROLOG) Init(1) Save

msched-prolog
Target Report Var(TARGET_SCHED_PROLOG) Save
Schedule the start and end of the procedure

maix-struct-return
Target Report RejectNegative Var(aix_struct_return) Save
Return all structures in memory (AIX default)

msvr4-struct-return
Target Report RejectNegative Var(aix_struct_return,0) Save
Return small structures in registers (SVR4 default)

mxl-compat
Target Report Var(TARGET_XL_COMPAT) Save
Conform more closely to IBM XLC semantics

mrecip
Target Report
Generate software reciprocal divide and square root for better throughput.

mrecip=
Target Report RejectNegative Joined
Generate software reciprocal divide and square root for better throughput.

mrecip-precision
Target Report Mask(RECIP_PRECISION) Save
Assume that the reciprocal estimate instructions provide more accuracy.

mno-fp-in-toc
Target Report RejectNegative Var(TARGET_NO_FP_IN_TOC) Save
Do not place floating point constants in TOC

mfp-in-toc
Target Report RejectNegative Var(TARGET_NO_FP_IN_TOC,0) Save
Place floating point constants in TOC

mno-sum-in-toc
Target RejectNegative Var(TARGET_NO_SUM_IN_TOC) Save
Do not place symbol+offset constants in TOC

msum-in-toc
Target RejectNegative Var(TARGET_NO_SUM_IN_TOC,0) Save
Place symbol+offset constants in TOC

;  Output only one TOC entry per module.  Normally linking fails if
;   there are more than 16K unique variables/constants in an executable.  With
;   this option, linking fails only if there are more than 16K modules, or
;   if there are more than 16K unique variables/constant in a single module.
;
;   This is at the cost of having 2 extra loads and one extra store per
;   function, and one less allocable register.
mminimal-toc
Target Report Mask(MINIMAL_TOC)
Use only one TOC entry per procedure

mfull-toc
Target Report
Put everything in the regular TOC

mvrsave
Target Report Var(TARGET_ALTIVEC_VRSAVE) Save
Generate VRSAVE instructions when generating AltiVec code

mvrsave=
Target RejectNegative Joined
-mvrsave=yes/no	Deprecated option.  Use -mvrsave/-mno-vrsave instead

mblock-move-inline-limit=
Target Report Var(rs6000_block_move_inline_limit) Init(0) RejectNegative Joined UInteger Save
Specify how many bytes should be moved inline before calling out to memcpy/memmove

misel
Target Report Mask(ISEL) Save
Generate isel instructions

misel=
Target RejectNegative Joined
-misel=yes/no	Deprecated option.  Use -misel/-mno-isel instead

mspe
Target
Generate SPE SIMD instructions on E500

mpaired
Target Var(rs6000_paired_float) Save
Generate PPC750CL paired-single instructions

mspe=
Target RejectNegative Joined
-mspe=yes/no	Deprecated option.  Use -mspe/-mno-spe instead

mdebug=
Target RejectNegative Joined
-mdebug=	Enable debug output

mabi=
Target RejectNegative Joined
-mabi=	Specify ABI to use

mcpu=
Target RejectNegative Joined
-mcpu=	Use features of and schedule code for given CPU

mtune=
Target RejectNegative Joined
-mtune=	Schedule code for given CPU

mtraceback=
Target RejectNegative Joined
-mtraceback=	Select full, part, or no traceback table

mlongcall
Target Report Var(rs6000_default_long_calls) Save
Avoid all range limits on call instructions

mgen-cell-microcode
Target Report Var(rs6000_gen_cell_microcode) Init(-1) Save
Generate Cell microcode

mwarn-cell-microcode
Target Var(rs6000_warn_cell_microcode) Init(0) Warning Save
Warn when a Cell microcoded instruction is emitted

mwarn-altivec-long
Target Var(rs6000_warn_altivec_long) Init(1) Save
Warn about deprecated 'vector long ...' AltiVec type usage

mfloat-gprs=
Target RejectNegative Joined
-mfloat-gprs=	Select GPR floating point method

mlong-double-
Target RejectNegative Joined UInteger
-mlong-double-<n>	Specify size of long double (64 or 128 bits)

msched-costly-dep=
Target RejectNegative Joined 
Determine which dependences between insns are considered costly

minsert-sched-nops=
Target RejectNegative Joined
Specify which post scheduling nop insertion scheme to apply

malign-
Target RejectNegative Joined
Specify alignment of structure fields default/natural

mprioritize-restricted-insns=
Target RejectNegative Joined UInteger Var(rs6000_sched_restricted_insns_priority) Save
Specify scheduling priority for dispatch slot restricted insns

msingle-float
Target RejectNegative Var(rs6000_single_float) Save
Single-precision floating point unit

mdouble-float
Target RejectNegative Var(rs6000_double_float) Save
Double-precision floating point unit

msimple-fpu
Target RejectNegative Var(rs6000_simple_fpu) Save
Floating point unit does not support divide & sqrt

mfpu=
Target RejectNegative Joined 
-mfpu=	Specify FP (sp, dp, sp-lite, dp-lite) (implies -mxilinx-fpu)

mxilinx-fpu
Target Var(rs6000_xilinx_fpu) Save
Specify Xilinx FPU.