diff options
Diffstat (limited to '0255-x86-Add-a-new-option-mdaz-ftz-to-enable-FTZ-and-DAZ-.patch')
| -rw-r--r-- | 0255-x86-Add-a-new-option-mdaz-ftz-to-enable-FTZ-and-DAZ-.patch | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/0255-x86-Add-a-new-option-mdaz-ftz-to-enable-FTZ-and-DAZ-.patch b/0255-x86-Add-a-new-option-mdaz-ftz-to-enable-FTZ-and-DAZ-.patch new file mode 100644 index 0000000..d96f552 --- /dev/null +++ b/0255-x86-Add-a-new-option-mdaz-ftz-to-enable-FTZ-and-DAZ-.patch @@ -0,0 +1,135 @@ +From 1649f9fbbc5267de2a675336d3ac665528a03db8 Mon Sep 17 00:00:00 2001 +From: liuhongt <hongtao.liu@intel.com> +Date: Wed, 10 May 2023 15:16:58 +0800 +Subject: [PATCH 01/28] x86: Add a new option -mdaz-ftz to enable FTZ and DAZ + flags in MXCSR. + + if (mdaz-ftz) + link crtfastmath.o + else if ((Ofast || ffast-math || funsafe-math-optimizations) + && !mno-daz-ftz) + link crtfastmath.o + else + Don't link crtfastmath.o + +gcc/ChangeLog: + + * config/i386/cygwin.h (ENDFILE_SPEC): Link crtfastmath.o + whenever -mdaz-ftz is specified. Don't link crtfastmath.o + when -mno-daz-ftz is specified. + * config/i386/darwin.h (ENDFILE_SPEC): Ditto. + * config/i386/gnu-user-common.h + (GNU_USER_TARGET_MATHFILE_SPEC): Ditto. + * config/i386/mingw32.h (ENDFILE_SPEC): Ditto. + * config/i386/i386.opt (mdaz-ftz): New option. + * doc/invoke.texi (x86 options): Document mftz-daz. +--- + gcc/config/i386/cygwin.h | 2 +- + gcc/config/i386/darwin.h | 4 ++-- + gcc/config/i386/gnu-user-common.h | 2 +- + gcc/config/i386/i386.opt | 4 ++++ + gcc/config/i386/mingw32.h | 2 +- + gcc/doc/invoke.texi | 11 ++++++++++- + 6 files changed, 19 insertions(+), 6 deletions(-) + +diff --git a/gcc/config/i386/cygwin.h b/gcc/config/i386/cygwin.h +index d06eda369..5412c5d44 100644 +--- a/gcc/config/i386/cygwin.h ++++ b/gcc/config/i386/cygwin.h +@@ -57,7 +57,7 @@ along with GCC; see the file COPYING3. If not see + + #undef ENDFILE_SPEC + #define ENDFILE_SPEC \ +- "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}\ ++ "%{mdaz-ftz:crtfastmath.o%s;Ofast|ffast-math|funsafe-math-optimizations:%{!mno-daz-ftz:crtfastmath.o%s}} \ + %{!shared:%:if-exists(default-manifest.o%s)}\ + %{fvtable-verify=none:%s; \ + fvtable-verify=preinit:vtv_end.o%s; \ +diff --git a/gcc/config/i386/darwin.h b/gcc/config/i386/darwin.h +index a55f6b2b8..2f773924d 100644 +--- a/gcc/config/i386/darwin.h ++++ b/gcc/config/i386/darwin.h +@@ -109,8 +109,8 @@ along with GCC; see the file COPYING3. If not see + "%{!force_cpusubtype_ALL:-force_cpusubtype_ALL} " + + #undef ENDFILE_SPEC +-#define ENDFILE_SPEC \ +- "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ ++#define ENDFILE_SPEC ++\ "%{mdaz-ftz:crtfastmath.o%s;Ofast|ffast-math|funsafe-math-optimizations:%{!mno-daz-ftz:crtfastmath.o%s}} \ + %{mpc32:crtprec32.o%s} \ + %{mpc64:crtprec64.o%s} \ + %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR +diff --git a/gcc/config/i386/gnu-user-common.h b/gcc/config/i386/gnu-user-common.h +index 23b54c5be..3d2a33f17 100644 +--- a/gcc/config/i386/gnu-user-common.h ++++ b/gcc/config/i386/gnu-user-common.h +@@ -47,7 +47,7 @@ along with GCC; see the file COPYING3. If not see + + /* Similar to standard GNU userspace, but adding -ffast-math support. */ + #define GNU_USER_TARGET_MATHFILE_SPEC \ +- "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ ++ "%{mdaz-ftz:crtfastmath.o%s;Ofast|ffast-math|funsafe-math-optimizations:%{!mno-daz-ftz:crtfastmath.o%s}} \ + %{mpc32:crtprec32.o%s} \ + %{mpc64:crtprec64.o%s} \ + %{mpc80:crtprec80.o%s}" +diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt +index fc1b944ac..498fb454d 100644 +--- a/gcc/config/i386/i386.opt ++++ b/gcc/config/i386/i386.opt +@@ -420,6 +420,10 @@ mpc80 + Target RejectNegative + Set 80387 floating-point precision to 80-bit. + ++mdaz-ftz ++Target ++Set the FTZ and DAZ Flags. ++ + mpreferred-stack-boundary= + Target RejectNegative Joined UInteger Var(ix86_preferred_stack_boundary_arg) + Attempt to keep stack aligned to this power of 2. +diff --git a/gcc/config/i386/mingw32.h b/gcc/config/i386/mingw32.h +index d3ca0cd02..ddbe6a405 100644 +--- a/gcc/config/i386/mingw32.h ++++ b/gcc/config/i386/mingw32.h +@@ -197,7 +197,7 @@ along with GCC; see the file COPYING3. If not see + + #undef ENDFILE_SPEC + #define ENDFILE_SPEC \ +- "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ ++ "%{mdaz-ftz:crtfastmath.o%s;Ofast|ffast-math|funsafe-math-optimizations:%{!mno-daz-ftz:crtfastmath.o%s}} \ + %{!shared:%:if-exists(default-manifest.o%s)}\ + %{fvtable-verify=none:%s; \ + fvtable-verify=preinit:vtv_end.o%s; \ +diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi +index 2b376e0e9..3a48655e5 100644 +--- a/gcc/doc/invoke.texi ++++ b/gcc/doc/invoke.texi +@@ -1437,7 +1437,7 @@ See RS/6000 and PowerPC Options. + -m96bit-long-double -mlong-double-64 -mlong-double-80 -mlong-double-128 @gol + -mregparm=@var{num} -msseregparm @gol + -mveclibabi=@var{type} -mvect8-ret-in-mem @gol +--mpc32 -mpc64 -mpc80 -mstackrealign @gol ++-mpc32 -mpc64 -mpc80 -mdaz-ftz -mstackrealign @gol + -momit-leaf-frame-pointer -mno-red-zone -mno-tls-direct-seg-refs @gol + -mcmodel=@var{code-model} -mabi=@var{name} -maddress-mode=@var{mode} @gol + -m32 -m64 -mx32 -m16 -miamcu -mlarge-data-threshold=@var{num} @gol +@@ -32122,6 +32122,15 @@ are enabled by default; routines in such libraries could suffer significant + loss of accuracy, typically through so-called ``catastrophic cancellation'', + when this option is used to set the precision to less than extended precision. + ++@item -mdaz-ftz ++@opindex mdaz-ftz ++ ++The flush-to-zero (FTZ) and denormals-are-zero (DAZ) flags in the MXCSR register ++are used to control floating-point calculations.SSE and AVX instructions ++including scalar and vector instructions could benefit from enabling the FTZ ++and DAZ flags when @option{-mdaz-ftz} is specified. Don't set FTZ/DAZ flags ++when @option{-mno-daz-ftz} is specified. ++ + @item -mstackrealign + @opindex mstackrealign + Realign the stack at entry. On the x86, the @option{-mstackrealign} +-- +2.31.1 + |