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sfp-exceptions.c (__sfp_handle_exceptions): Rewrite FP_EX_INEXACT handling. 

* config/i386/sfp-exceptions.c (__sfp_handle_exceptions): Rewrite
	FP_EX_INEXACT handling.

From-SVN: r204546
This commit is contained in:
Uros Bizjak 2013-11-07 22:53:54 +01:00 committed by Uros Bizjak
parent 722516b81f
commit 9de84e84f2
2 changed files with 12 additions and 7 deletions
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1
libgcc/ChangeLog
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@ -4,6 +4,7 @@
FP_EX_DENORM. Store result to volatile location after SSE division
to close interrupt window. Remove unneeded fwait after x87
division since interrupt window will be closed by emitted fstp.
Rewrite FP_EX_INEXACT handling.
2013-11-06 Joseph Myers <joseph@codesourcery.com>

18
libgcc/config/i386/sfp-exceptions.c
View File

@ -48,7 +48,7 @@ __sfp_handle_exceptions (int _fex)
{
float f = 0.0f;
#ifdef __x86_64__
volatile float r;
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f));
r = f; /* Needed to trigger exception. */
#else
@ -68,7 +68,7 @@ __sfp_handle_exceptions (int _fex)
{
float f = 1.0f, g = 0.0f;
#ifdef __x86_64__
volatile float r;
volatile float r __attribute__ ((unused));
asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
r = f; /* Needed to trigger exception. */
#else
@ -94,11 +94,15 @@ __sfp_handle_exceptions (int _fex)
}
if (_fex & FP_EX_INEXACT)
{
struct fenv temp;
asm volatile ("fnstenv\t%0" : "=m" (temp));
temp.__status_word |= FP_EX_INEXACT;
asm volatile ("fldenv\t%0" : : "m" (temp));
asm volatile ("fwait");
float f = 1.0f, g = 3.0f;
#ifdef __x86_64__
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. */
#endif
}
};
#endif