i386: Remove unneeded assignments when triggering SSE exceptions
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
parent
5fe50e5a5c
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84282b05a8
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@ -1,3 +1,8 @@
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2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
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* config/x86/fenv.c (__atomic_feraiseexcept) [__SSE_MATH__]:
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Remove unneeded assignments to volatile memory.
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2020-03-12 Release Manager
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* GCC 9.3.0 released.
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@ -57,9 +57,7 @@ __atomic_feraiseexcept (int excepts)
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{
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float f = 0.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
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r = f; /* Needed to trigger exception. */
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#else
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asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -77,9 +75,7 @@ __atomic_feraiseexcept (int excepts)
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{
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float f = 1.0f, g = 0.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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r = f; /* Needed to trigger exception. */
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#else
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asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -105,9 +101,7 @@ __atomic_feraiseexcept (int excepts)
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{
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float f = 1.0f, g = 3.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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r = f; /* Needed to trigger exception. */
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#else
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asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -1,3 +1,8 @@
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2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
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* config/i386/sfp-exceptions.c (__sfp_handle_exceptions) [__SSE_MATH__]:
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Remove unneeded assignments to volatile memory.
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2020-04-01 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
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Backport from mainline
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@ -48,9 +48,7 @@ __sfp_handle_exceptions (int _fex)
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{
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float f = 0.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
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r = f; /* Needed to trigger exception. */
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#else
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asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -68,9 +66,7 @@ __sfp_handle_exceptions (int _fex)
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{
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float f = 1.0f, g = 0.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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r = f; /* Needed to trigger exception. */
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#else
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asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -96,9 +92,7 @@ __sfp_handle_exceptions (int _fex)
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{
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float f = 1.0f, g = 3.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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r = f; /* Needed to trigger exception. */
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#else
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asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -1,3 +1,8 @@
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2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
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* config/fpu-387.h (local_feraiseexcept) [__SSE_MATH__]:
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Remove unneeded assignments to volatile memory.
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2020-03-12 Release Manager
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* GCC 9.3.0 released.
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@ -103,9 +103,7 @@ local_feraiseexcept (int excepts)
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{
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float f = 0.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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__asm__ __volatile__ ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
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r = f; /* Needed to trigger exception. */
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#else
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__asm__ __volatile__ ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -123,9 +121,7 @@ local_feraiseexcept (int excepts)
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{
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float f = 1.0f, g = 0.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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__asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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r = f; /* Needed to trigger exception. */
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#else
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__asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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@ -151,9 +147,7 @@ local_feraiseexcept (int excepts)
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{
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float f = 1.0f, g = 3.0f;
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#ifdef __SSE_MATH__
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volatile float r __attribute__ ((unused));
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__asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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r = f; /* Needed to trigger exception. */
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#else
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__asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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