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sfp-exceptions.c (__sfp_handle_exceptions): Handle FP_EX_DENORM.

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* config/i386/sfp-exceptions.c (__sfp_handle_exceptions): Handle
	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.

From-SVN: r204540
This commit is contained in:
Uros Bizjak 2013-11-07 20:45:28 +01:00 committed by Uros Bizjak
parent f6de942eeb
commit d59a8fcce6
2 changed files with 21 additions and 2 deletions
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7
libgcc/ChangeLog
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@ -1,3 +1,10 @@
2013-11-07 Uros Bizjak <ubizjak@gmail.com>
* config/i386/sfp-exceptions.c (__sfp_handle_exceptions): Handle
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.
2013-11-06 Joseph Myers <joseph@codesourcery.com>
* soft-fp/README: Update.

16
libgcc/config/i386/sfp-exceptions.c
View File

@ -48,20 +48,32 @@ __sfp_handle_exceptions (int _fex)
{
float f = 0.0f;
#ifdef __x86_64__
volatile float r;
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));
asm volatile ("fwait");
/* No need for fwait, exception is triggered by emitted fstp. */
#endif
}
if (_fex & FP_EX_DENORM)
{
struct fenv temp;
asm volatile ("fnstenv\t%0" : "=m" (temp));
temp.__status_word |= FP_EX_DENORM;
asm volatile ("fldenv\t%0" : : "m" (temp));
asm volatile ("fwait");
}
if (_fex & FP_EX_DIVZERO)
{
float f = 1.0f, g = 0.0f;
#ifdef __x86_64__
volatile float r;
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));
asm volatile ("fwait");
/* No need for fwait, exception is triggered by emitted fstp. */
#endif
}
if (_fex & FP_EX_OVERFLOW)