diff options
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/ChangeLog | 7 | ||||
| -rw-r--r-- | libgcc/config/i386/sfp-exceptions.c | 16 |
2 files changed, 21 insertions, 2 deletions
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index 4da11a0406b..8a644d74528 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -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. diff --git a/libgcc/config/i386/sfp-exceptions.c b/libgcc/config/i386/sfp-exceptions.c index fbaaab22f50..6d449ec6093 100644 --- a/libgcc/config/i386/sfp-exceptions.c +++ b/libgcc/config/i386/sfp-exceptions.c @@ -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) |
