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i386: Remove unneeded assignments when triggering SSE exceptions

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According to "Intel 64 and IA32 Arch SDM, Vol. 3:

"Because SIMD floating-point exceptions are precise and occur immediately,
the situation does not arise where an x87 FPU instruction, a WAIT/FWAIT
instruction, or another SSE/SSE2/SSE3 instruction will catch a pending
unmasked SIMD floating-point exception."

Remove unneeded assignments to volatile memory.

libgcc/ChangeLog:

	* config/i386/sfp-exceptions.c (__sfp_handle_exceptions) [__SSE_MATH__]:
	Remove unneeded assignments to volatile memory.

libatomic/ChangeLog:

	* config/x86/fenv.c (__atomic_feraiseexcept) [__SSE_MATH__]:
	Remove unneeded assignments to volatile memory.

libgfortran/ChangeLog:

	* config/fpu-387.h (local_feraiseexcept) [__SSE_MATH__]:
	Remove unneeded assignments to volatile memory.
This commit is contained in:
Uros Bizjak 2020-04-19 14:23:47 +02:00
parent 9382018b8b
commit df73e5842f
6 changed files with 15 additions and 18 deletions
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5
libatomic/ChangeLog
View file

@ -1,3 +1,8 @@
2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
* config/x86/fenv.c (__atomic_feraiseexcept) [__SSE_MATH__]:
Remove unneeded assignments to volatile memory.
2020-04-06 Maciej W. Rozycki <macro@wdc.com>
* configure.ac: Add testsuite/libatomic-site-extra.exp to output

6
libatomic/config/x86/fenv.c
View file

@ -57,9 +57,7 @@ __atomic_feraiseexcept (int excepts)
{
float f = 0.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
r = f; /* Needed to trigger exception. */
#else
asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
/* No need for fwait, exception is triggered by emitted fstp. */
@ -77,9 +75,7 @@ __atomic_feraiseexcept (int excepts)
{
float f = 1.0f, g = 0.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
/* No need for fwait, exception is triggered by emitted fstp. */
@ -105,9 +101,7 @@ __atomic_feraiseexcept (int excepts)
{
float f = 1.0f, g = 3.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
/* No need for fwait, exception is triggered by emitted fstp. */

5
libgcc/ChangeLog
View file

@ -1,3 +1,8 @@
2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
* config/i386/sfp-exceptions.c (__sfp_handle_exceptions) [__SSE_MATH__]:
Remove unneeded assignments to volatile memory.
2020-04-15 Jakub Jelinek <jakub@redhat.com>
PR target/93053

6
libgcc/config/i386/sfp-exceptions.c
View file

@ -48,9 +48,7 @@ __sfp_handle_exceptions (int _fex)
{
float f = 0.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
r = f; /* Needed to trigger exception. */
#else
asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
/* No need for fwait, exception is triggered by emitted fstp. */
@ -68,9 +66,7 @@ __sfp_handle_exceptions (int _fex)
{
float f = 1.0f, g = 0.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
/* No need for fwait, exception is triggered by emitted fstp. */
@ -96,9 +92,7 @@ __sfp_handle_exceptions (int _fex)
{
float f = 1.0f, g = 3.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
/* No need for fwait, exception is triggered by emitted fstp. */

5
libgfortran/ChangeLog
View file

@ -1,3 +1,8 @@
2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
* config/fpu-387.h (local_feraiseexcept) [__SSE_MATH__]:
Remove unneeded assignments to volatile memory.
2020-04-01 Fritz Reese <foreese@gcc.gnu.org>
Steven G. Kargl <kargl@gcc.gnu.org>

6
libgfortran/config/fpu-387.h
View file

@ -103,9 +103,7 @@ local_feraiseexcept (int excepts)
{
float f = 0.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
__asm__ __volatile__ ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
r = f; /* Needed to trigger exception. */
#else
__asm__ __volatile__ ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
/* No need for fwait, exception is triggered by emitted fstp. */
@ -123,9 +121,7 @@ local_feraiseexcept (int excepts)
{
float f = 1.0f, g = 0.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
__asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
__asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
/* No need for fwait, exception is triggered by emitted fstp. */
@ -151,9 +147,7 @@ local_feraiseexcept (int excepts)
{
float f = 1.0f, g = 3.0f;
#ifdef __SSE_MATH__
volatile float r __attribute__ ((unused));
__asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
__asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
/* No need for fwait, exception is triggered by emitted fstp. */