136 lines
5.5 KiB
Diff
136 lines
5.5 KiB
Diff
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 03/32] 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}
|
|
--
|
|
2.28.0.windows.1
|
|
|