| Message ID | 1D5A5332-490C-4926-B1DA-278593455908@imgtec.com |
|---|---|
| State | New |
| Headers | show |
Hi, folks, any idea about this patch? > 在 2016年12月24日，20:53，Yunqiang Su <Yunqiang.Su@imgtec.com> 写道： > > By this patch, I add > build-time options: > —with-madd4=unfused/fused/no > runtime options: > -mmadd4=unfused/fused/no > > to disable or set madd.fmt type. > > For MIPS r6 (TARGET_MIPS8000) and Loongson (TARGET_LOONGSON_3A), > it always generate fused madd.fmt or maddf.fmt. > > diff --git a/gcc/config.gcc b/gcc/config.gcc > index 7afbc54bc78..7176d4484f7 100644 > --- a/gcc/config.gcc > +++ b/gcc/config.gcc > @@ -3940,7 +3940,7 @@ case "${target}" in > ;; > > mips*-*-*) > - supported_defaults="abi arch arch_32 arch_64 float fpu nan fp_32 odd_spreg_32 tune tune_32 tune_64 divide llsc mips-plt synci" > + supported_defaults="abi arch arch_32 arch_64 float fpu nan fp_32 odd_spreg_32 madd4 tune tune_32 tune_64 divide llsc mips-plt synci" > > case ${with_float} in > "" | soft | hard) > @@ -3997,6 +3997,16 @@ case "${target}" in > exit 1 > ;; > esac > + > + case ${with_madd4} in > + "" | fused | unfused | no) > + # OK > + ;; > + *) > + echo "Unknown madd4 type used in --with-madd4=$with_madd4" 1>&2 > + exit 1 > + ;; > + esac > > case ${with_abi} in > "" | 32 | o64 | n32 | 64 | eabi) > @@ -4496,7 +4506,7 @@ case ${target} in > esac > > t= > -all_defaults="abi cpu cpu_32 cpu_64 arch arch_32 arch_64 tune tune_32 tune_64 schedule float mode fpu nan fp_32 odd_spreg_32 divide llsc mips-plt synci tls" > +all_defaults="abi cpu cpu_32 cpu_64 arch arch_32 arch_64 tune tune_32 tune_64 schedule float mode fpu nan fp_32 odd_spreg_32 madd4 divide llsc mips-plt synci tls" > for option in $all_defaults > do > eval "val=\$with_"`echo $option | sed s/-/_/g` > diff --git a/gcc/config/mips/mips-opts.h b/gcc/config/mips/mips-opts.h > index 40aa006bc4e..ea1e0ea5310 100644 > --- a/gcc/config/mips/mips-opts.h > +++ b/gcc/config/mips/mips-opts.h > @@ -34,6 +34,13 @@ enum mips_ieee_754_setting { > MIPS_IEEE_754_2008 > }; > > +/* Enumerates the setting of the -mmadd4 option. */ > +enum mips_madd4_setting { > + MIPS_MADD4_DEFAULT, > + MIPS_MADD4_UNFUSED, > + MIPS_MADD4_FUSED, > + MIPS_MADD4_NO > +}; > /* Enumerates the setting of the -mr10k-cache-barrier option. */ > enum mips_r10k_cache_barrier_setting { > R10K_CACHE_BARRIER_NONE, > diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h > index bb66c428dd1..e8ca94ac709 100644 > --- a/gcc/config/mips/mips.h > +++ b/gcc/config/mips/mips.h > @@ -863,6 +863,7 @@ struct mips_cpu_info { > ":%{!msoft-float:%{!msingle-float:%{!mfp*:%{!mmsa:-mfp%(VALUE)}}}}}" }, \ > {"odd_spreg_32", "%{" OPT_ARCH32 ":%{!msoft-float:%{!msingle-float:" \ > "%{!modd-spreg:%{!mno-odd-spreg:-m%(VALUE)}}}}}" }, \ > + {"madd4", "%{!mmadd4=*:-mmadd4=%(VALUE)}" }, \ > {"divide", "%{!mdivide-traps:%{!mdivide-breaks:-mdivide-%(VALUE)}}" }, \ > {"llsc", "%{!mllsc:%{!mno-llsc:-m%(VALUE)}}" }, \ > {"mips-plt", "%{!mplt:%{!mno-plt:-m%(VALUE)}}" }, \ > @@ -1056,11 +1057,12 @@ struct mips_cpu_info { > > /* ISA has 4 operand fused madd instructions of the form > 'd = [+-] (a * b [+-] c)'. */ > -#define ISA_HAS_FUSED_MADD4 TARGET_MIPS8000 > +#define ISA_HAS_FUSED_MADD4 (TARGET_MIPS8000 || TARGET_LOONGSON_3A || (mips_madd4==MIPS_MADD4_FUSED)) > > /* ISA has 4 operand unfused madd instructions of the form > 'd = [+-] (a * b [+-] c)'. */ > -#define ISA_HAS_UNFUSED_MADD4 (ISA_HAS_FP4 && !TARGET_MIPS8000) > +#define ISA_HAS_UNFUSED_MADD4 (ISA_HAS_FP4 && !TARGET_MIPS8000 && !TARGET_LOONGSON_3A && \ > + (mips_madd4!=MIPS_MADD4_FUSED) && (mips_madd4!=MIPS_MADD4_NO)) > > /* ISA has 3 operand r6 fused madd instructions of the form > 'c = c [+-] (a * b)'. */ > diff --git a/gcc/config/mips/mips.opt b/gcc/config/mips/mips.opt > index 08dd83e14ce..0d9a6e4362e 100644 > --- a/gcc/config/mips/mips.opt > +++ b/gcc/config/mips/mips.opt > @@ -416,6 +416,23 @@ modd-spreg > Target Report Mask(ODD_SPREG) > Enable use of odd-numbered single-precision registers. > > +mmadd4= > +Target RejectNegative Joined Enum(mips_madd4_value) Var(mips_madd4) Init(MIPS_MADD4_DEFAULT) > +-mmadd4=TYPE Select madd.fmt/msub.fmt type. > + > +Enum > +Name(mips_madd4_value) Type(int) > +Known MIPS madd.fmt type settings (for use with the -mmadd4 options): > + > +EnumValue > +Enum(mips_madd4_value) String(unfused) Value(MIPS_MADD4_UNFUSED) > + > +EnumValue > +Enum(mips_madd4_value) String(fused) Value(MIPS_MADD4_FUSED) > + > +EnumValue > +Enum(mips_madd4_value) String(no) Value(MIPS_MADD4_NO) > + > mframe-header-opt > Target Report Var(flag_frame_header_optimization) Optimization > Optimize frame header. > diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi > index b911d76dd66..e548733537d 100644 > --- a/gcc/doc/install.texi > +++ b/gcc/doc/install.texi > @@ -1338,6 +1338,23 @@ In the absence of this configuration option the default convention is > the legacy encoding, as when neither of the @option{-mnan=2008} and > @option{-mnan=legacy} command-line options has been used. > > +@item --with-madd4=@var{type} > +On MIPS targets, set the default behaivor of madd.fmt/msub.fmt. The > +possibilities for @var{type} are: > +@table @code > +@item unfused > +The madd.fmt/msub.fmt instructions are unfused, as with the > +@option{-mmadd4=unfused} command-line option. > +@item fused > +The madd.fmt/msub.fmt instructions are fused, as with the > +@option{-mmadd4=fused} command-line option. > +@item no > +The madd.fmt/msub.fmt are disabled, as with the @option{-mmadd4=no} > +command-line option. > +@end table > +In the absence of this configuration option the default convention is > +the unfused, while for MIPS r6 and Loongson, the default is fused. > + > @item --with-divide=@var{type} > Specify how the compiler should generate code for checking for > division by zero. This option is only supported on the MIPS target. > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi > index 1096254085f..e88040cdceb 100644 > --- a/gcc/doc/invoke.texi > +++ b/gcc/doc/invoke.texi > @@ -19289,6 +19289,29 @@ their trailing significand field being 0. > The default is @option{-mnan=legacy} unless GCC has been configured with > @option{--with-nan=2008}. > > +@item -mmadd4=unfused > +@item -mmadd4=fused > +@item -mmadd4=no > +@opindex mmadd4=unfused > +@opindex mmadd4=fused > +@opindex mmadd4=no > +These options control the type of madd.fmt/msub.fmt, unfused, fused > +or disabled at all. > + > +The @option{-mmadd4=unfused} option will set type of madd.fmt/msub.fmt > +to be unfused if they are generated. > + > +The @option{-mmadd4=fused} option will set type of madd.fmt/msub.fmt > +to be fused if they are generated. > + > +The @option{-mmadd4=no} option will disable madd.fmt/msub.fmt > +to be generated at all. > + > +The default is @option{-mmadd4=unfused} unless GCC has been configured > +for MIPS r6+ or Loongson. If runtime flags for MIPS r6 or Loongson is > +given, the type will always be `fused', no matter what value > +@option{-mmadd4=} is. > + > @item -mllsc > @itemx -mno-llsc > @opindex mllsc >
On 01/10/2017 07:24 AM, Yunqiang Su wrote: > Hi, folks, any idea about this patch? I can only comment on the documentation parts. >> diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi >> index b911d76dd66..e548733537d 100644 >> --- a/gcc/doc/install.texi >> +++ b/gcc/doc/install.texi >> @@ -1338,6 +1338,23 @@ In the absence of this configuration option the default convention is >> the legacy encoding, as when neither of the @option{-mnan=2008} and >> @option{-mnan=legacy} command-line options has been used. >> >> +@item --with-madd4=@var{type} >> +On MIPS targets, set the default behaivor of madd.fmt/msub.fmt. The s/behaivor/behavior/ Are you really setting/describing the behavior of these instructions on the target, or are you setting how GCC generates code for them? >> +possibilities for @var{type} are: >> +@table @code >> +@item unfused >> +The madd.fmt/msub.fmt instructions are unfused, as with the >> +@option{-mmadd4=unfused} command-line option. >> +@item fused >> +The madd.fmt/msub.fmt instructions are fused, as with the >> +@option{-mmadd4=fused} command-line option. >> +@item no >> +The madd.fmt/msub.fmt are disabled, as with the @option{-mmadd4=no} s/are/instructions are/ >> +command-line option. >> +@end table >> +In the absence of this configuration option the default convention is >> +the unfused, while for MIPS r6 and Loongson, the default is fused. s/the unfused/@samp{unfused} s/fused/@samp{fused} The MIPS maintainers may correct me on this, but it looks to me like "MIPS r6" is not an official name of anything. I see "MIPS Release 6" on the Imagination web site and in the MIPS processor documentation. Finally, I'm confused about whether the default is based on the processor selected at compile time, or depends on some other configure-time option. >> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi >> index 1096254085f..e88040cdceb 100644 >> --- a/gcc/doc/invoke.texi >> +++ b/gcc/doc/invoke.texi >> @@ -19289,6 +19289,29 @@ their trailing significand field being 0. >> The default is @option{-mnan=legacy} unless GCC has been configured with >> @option{--with-nan=2008}. >> >> +@item -mmadd4=unfused >> +@item -mmadd4=fused >> +@item -mmadd4=no Use @itemx instead of @item for entries other than the first. >> +@opindex mmadd4=unfused >> +@opindex mmadd4=fused >> +@opindex mmadd4=no I think it's sufficient to just have a single index entry @opindex mmadd4= >> +These options control the type of madd.fmt/msub.fmt, unfused, fused >> +or disabled at all. "type of" is confusing. Maybe just say These options control generation of madd.fmt/msub.fmt instructions. >> + >> +The @option{-mmadd4=unfused} option will set type of madd.fmt/msub.fmt Same concerns about "type of" here, plus s/will set/sets/ >> +to be unfused if they are generated. >> + >> +The @option{-mmadd4=fused} option will set type of madd.fmt/msub.fmt >> +to be fused if they are generated. Same here. >> + >> +The @option{-mmadd4=no} option will disable madd.fmt/msub.fmt >> +to be generated at all. s/will disable/prevents/ s/to be generated/from being generated/ >> + >> +The default is @option{-mmadd4=unfused} unless GCC has been configured >> +for MIPS r6+ or Loongson. If runtime flags for MIPS r6 or Loongson is >> +given, the type will always be `fused', no matter what value >> +@option{-mmadd4=} is. >> + Same concerns about "MIPS r6". I suggest rewriting the second sentence as something like "If compiling for a MIPS Release 6 or Loongson processor, this option is ignored and the behavior is as if @samp{fused} were specified." I think we are talking about controlling code generation determined by compilation options, and not detecting runtime processor flag bits, right? -Sandra
Sandra Loosemore <sandra@codesourcery.com> writes: > On 01/10/2017 07:24 AM, Yunqiang Su wrote: > > Hi, folks, any idea about this patch? > > I can only comment on the documentation parts. I am reviewing the patch but need to determine if the changes are sufficient and safe to meet the goal. This area is complex in the MIPS backend so it will be a few days to respond. Sandra: Thanks for your docs review, much appreciated. Thanks, Matthew > > >> diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi > >> index b911d76dd66..e548733537d 100644 > >> --- a/gcc/doc/install.texi > >> +++ b/gcc/doc/install.texi > >> @@ -1338,6 +1338,23 @@ In the absence of this configuration option the default > convention is > >> the legacy encoding, as when neither of the @option{-mnan=2008} and > >> @option{-mnan=legacy} command-line options has been used. > >> > >> +@item --with-madd4=@var{type} > >> +On MIPS targets, set the default behaivor of madd.fmt/msub.fmt. The > > s/behaivor/behavior/ > > Are you really setting/describing the behavior of these instructions on > the target, or are you setting how GCC generates code for them? > > >> +possibilities for @var{type} are: > >> +@table @code > >> +@item unfused > >> +The madd.fmt/msub.fmt instructions are unfused, as with the > >> +@option{-mmadd4=unfused} command-line option. > >> +@item fused > >> +The madd.fmt/msub.fmt instructions are fused, as with the > >> +@option{-mmadd4=fused} command-line option. > >> +@item no > >> +The madd.fmt/msub.fmt are disabled, as with the @option{-mmadd4=no} > > s/are/instructions are/ > >> +command-line option. > >> +@end table > >> +In the absence of this configuration option the default convention is > >> +the unfused, while for MIPS r6 and Loongson, the default is fused. > > s/the unfused/@samp{unfused} > s/fused/@samp{fused} > > The MIPS maintainers may correct me on this, but it looks to me like > "MIPS r6" is not an official name of anything. I see "MIPS Release 6" > on the Imagination web site and in the MIPS processor documentation. > > Finally, I'm confused about whether the default is based on the > processor selected at compile time, or depends on some other > configure-time option. > > >> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi > >> index 1096254085f..e88040cdceb 100644 > >> --- a/gcc/doc/invoke.texi > >> +++ b/gcc/doc/invoke.texi > >> @@ -19289,6 +19289,29 @@ their trailing significand field being 0. > >> The default is @option{-mnan=legacy} unless GCC has been configured with > >> @option{--with-nan=2008}. > >> > >> +@item -mmadd4=unfused > >> +@item -mmadd4=fused > >> +@item -mmadd4=no > > Use @itemx instead of @item for entries other than the first. > > >> +@opindex mmadd4=unfused > >> +@opindex mmadd4=fused > >> +@opindex mmadd4=no > > I think it's sufficient to just have a single index entry > > @opindex mmadd4= > > >> +These options control the type of madd.fmt/msub.fmt, unfused, fused > >> +or disabled at all. > > "type of" is confusing. Maybe just say > > These options control generation of madd.fmt/msub.fmt instructions. > > >> + > >> +The @option{-mmadd4=unfused} option will set type of madd.fmt/msub.fmt > > Same concerns about "type of" here, plus > s/will set/sets/ > > >> +to be unfused if they are generated. > >> + > >> +The @option{-mmadd4=fused} option will set type of madd.fmt/msub.fmt > >> +to be fused if they are generated. > > Same here. > > >> + > >> +The @option{-mmadd4=no} option will disable madd.fmt/msub.fmt > >> +to be generated at all. > > s/will disable/prevents/ > s/to be generated/from being generated/ > > > >> + > >> +The default is @option{-mmadd4=unfused} unless GCC has been configured > >> +for MIPS r6+ or Loongson. If runtime flags for MIPS r6 or Loongson is > >> +given, the type will always be `fused', no matter what value > >> +@option{-mmadd4=} is. > >> + > > Same concerns about "MIPS r6". > > I suggest rewriting the second sentence as something like > > "If compiling for a MIPS Release 6 or Loongson processor, this option is > ignored and the behavior is as if @samp{fused} were specified." > > I think we are talking about controlling code generation determined by > compilation options, and not detecting runtime processor flag bits, right? > > -Sandra
diff --git a/gcc/config.gcc b/gcc/config.gcc index 7afbc54bc78..7176d4484f7 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -3940,7 +3940,7 @@ case "${target}" in ;; mips*-*-*) - supported_defaults="abi arch arch_32 arch_64 float fpu nan fp_32 odd_spreg_32 tune tune_32 tune_64 divide llsc mips-plt synci" + supported_defaults="abi arch arch_32 arch_64 float fpu nan fp_32 odd_spreg_32 madd4 tune tune_32 tune_64 divide llsc mips-plt synci" case ${with_float} in "" | soft | hard) @@ -3997,6 +3997,16 @@ case "${target}" in exit 1 ;; esac + + case ${with_madd4} in + "" | fused | unfused | no) + # OK + ;; + *) + echo "Unknown madd4 type used in --with-madd4=$with_madd4" 1>&2 + exit 1 + ;; + esac case ${with_abi} in "" | 32 | o64 | n32 | 64 | eabi) @@ -4496,7 +4506,7 @@ case ${target} in esac t= -all_defaults="abi cpu cpu_32 cpu_64 arch arch_32 arch_64 tune tune_32 tune_64 schedule float mode fpu nan fp_32 odd_spreg_32 divide llsc mips-plt synci tls" +all_defaults="abi cpu cpu_32 cpu_64 arch arch_32 arch_64 tune tune_32 tune_64 schedule float mode fpu nan fp_32 odd_spreg_32 madd4 divide llsc mips-plt synci tls" for option in $all_defaults do eval "val=\$with_"`echo $option | sed s/-/_/g` diff --git a/gcc/config/mips/mips-opts.h b/gcc/config/mips/mips-opts.h index 40aa006bc4e..ea1e0ea5310 100644 --- a/gcc/config/mips/mips-opts.h +++ b/gcc/config/mips/mips-opts.h @@ -34,6 +34,13 @@ enum mips_ieee_754_setting { MIPS_IEEE_754_2008 }; +/* Enumerates the setting of the -mmadd4 option. */ +enum mips_madd4_setting { + MIPS_MADD4_DEFAULT, + MIPS_MADD4_UNFUSED, + MIPS_MADD4_FUSED, + MIPS_MADD4_NO +}; /* Enumerates the setting of the -mr10k-cache-barrier option. */ enum mips_r10k_cache_barrier_setting { R10K_CACHE_BARRIER_NONE, diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h index bb66c428dd1..e8ca94ac709 100644 --- a/gcc/config/mips/mips.h +++ b/gcc/config/mips/mips.h @@ -863,6 +863,7 @@ struct mips_cpu_info { ":%{!msoft-float:%{!msingle-float:%{!mfp*:%{!mmsa:-mfp%(VALUE)}}}}}" }, \ {"odd_spreg_32", "%{" OPT_ARCH32 ":%{!msoft-float:%{!msingle-float:" \ "%{!modd-spreg:%{!mno-odd-spreg:-m%(VALUE)}}}}}" }, \ + {"madd4", "%{!mmadd4=*:-mmadd4=%(VALUE)}" }, \ {"divide", "%{!mdivide-traps:%{!mdivide-breaks:-mdivide-%(VALUE)}}" }, \ {"llsc", "%{!mllsc:%{!mno-llsc:-m%(VALUE)}}" }, \ {"mips-plt", "%{!mplt:%{!mno-plt:-m%(VALUE)}}" }, \ @@ -1056,11 +1057,12 @@ struct mips_cpu_info { /* ISA has 4 operand fused madd instructions of the form 'd = [+-] (a * b [+-] c)'. */ -#define ISA_HAS_FUSED_MADD4 TARGET_MIPS8000 +#define ISA_HAS_FUSED_MADD4 (TARGET_MIPS8000 || TARGET_LOONGSON_3A || (mips_madd4==MIPS_MADD4_FUSED)) /* ISA has 4 operand unfused madd instructions of the form 'd = [+-] (a * b [+-] c)'. */ -#define ISA_HAS_UNFUSED_MADD4 (ISA_HAS_FP4 && !TARGET_MIPS8000) +#define ISA_HAS_UNFUSED_MADD4 (ISA_HAS_FP4 && !TARGET_MIPS8000 && !TARGET_LOONGSON_3A && \ + (mips_madd4!=MIPS_MADD4_FUSED) && (mips_madd4!=MIPS_MADD4_NO)) /* ISA has 3 operand r6 fused madd instructions of the form 'c = c [+-] (a * b)'. */ diff --git a/gcc/config/mips/mips.opt b/gcc/config/mips/mips.opt index 08dd83e14ce..0d9a6e4362e 100644 --- a/gcc/config/mips/mips.opt +++ b/gcc/config/mips/mips.opt @@ -416,6 +416,23 @@ modd-spreg Target Report Mask(ODD_SPREG) Enable use of odd-numbered single-precision registers. +mmadd4= +Target RejectNegative Joined Enum(mips_madd4_value) Var(mips_madd4) Init(MIPS_MADD4_DEFAULT) +-mmadd4=TYPE Select madd.fmt/msub.fmt type. + +Enum +Name(mips_madd4_value) Type(int) +Known MIPS madd.fmt type settings (for use with the -mmadd4 options): + +EnumValue +Enum(mips_madd4_value) String(unfused) Value(MIPS_MADD4_UNFUSED) + +EnumValue +Enum(mips_madd4_value) String(fused) Value(MIPS_MADD4_FUSED) + +EnumValue +Enum(mips_madd4_value) String(no) Value(MIPS_MADD4_NO) + mframe-header-opt Target Report Var(flag_frame_header_optimization) Optimization Optimize frame header. diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index b911d76dd66..e548733537d 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -1338,6 +1338,23 @@ In the absence of this configuration option the default convention is the legacy encoding, as when neither of the @option{-mnan=2008} and @option{-mnan=legacy} command-line options has been used. +@item --with-madd4=@var{type} +On MIPS targets, set the default behaivor of madd.fmt/msub.fmt. The +possibilities for @var{type} are: +@table @code +@item unfused +The madd.fmt/msub.fmt instructions are unfused, as with the +@option{-mmadd4=unfused} command-line option. +@item fused +The madd.fmt/msub.fmt instructions are fused, as with the +@option{-mmadd4=fused} command-line option. +@item no +The madd.fmt/msub.fmt are disabled, as with the @option{-mmadd4=no} +command-line option. +@end table +In the absence of this configuration option the default convention is +the unfused, while for MIPS r6 and Loongson, the default is fused. + @item --with-divide=@var{type} Specify how the compiler should generate code for checking for division by zero. This option is only supported on the MIPS target. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 1096254085f..e88040cdceb 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -19289,6 +19289,29 @@ their trailing significand field being 0. The default is @option{-mnan=legacy} unless GCC has been configured with @option{--with-nan=2008}. +@item -mmadd4=unfused +@item -mmadd4=fused +@item -mmadd4=no +@opindex mmadd4=unfused +@opindex mmadd4=fused +@opindex mmadd4=no +These options control the type of madd.fmt/msub.fmt, unfused, fused +or disabled at all. + +The @option{-mmadd4=unfused} option will set type of madd.fmt/msub.fmt +to be unfused if they are generated. + +The @option{-mmadd4=fused} option will set type of madd.fmt/msub.fmt +to be fused if they are generated. + +The @option{-mmadd4=no} option will disable madd.fmt/msub.fmt +to be generated at all. + +The default is @option{-mmadd4=unfused} unless GCC has been configured +for MIPS r6+ or Loongson. If runtime flags for MIPS r6 or Loongson is +given, the type will always be `fused', no matter what value +@option{-mmadd4=} is. + @item -mllsc @itemx -mno-llsc @opindex mllsc
By this patch, I add build-time options: —with-madd4=unfused/fused/no runtime options: -mmadd4=unfused/fused/no to disable or set madd.fmt type. For MIPS r6 (TARGET_MIPS8000) and Loongson (TARGET_LOONGSON_3A), it always generate fused madd.fmt or maddf.fmt.