[PATCH, i386]: Use AVX FP instructions in libgcc soft-fp exception handler

[Uros Bizjak]

Hello!

2011-08-23  Uros Bizjak  <ubiz...@gmail.com>

        * config/i386/64/sfp-machine.h (ASM_INVALID): New define.
        (ASM_DIVZERO): Ditto.
        (FP_HANLDE_EXCEPTIONS): Use ASM_INVALID and ASM_DIVZERO.

Tested on x86_64-pc-linux-gnu {,-m32}. Committed to mainline SVN, will
be backported to release branches.

Uros.

Index: config/i386/64/sfp-machine.h
===================================================================
--- config/i386/64/sfp-machine.h        (revision 177972)
+++ config/i386/64/sfp-machine.h        (working copy)
@@ -73,17 +73,25 @@
   unsigned short int __unused5;
 };
 
+#ifdef __AVX__
+ #define ASM_INVALID "vdivss %0, %0, %0"
+ #define ASM_DIVZERO "vdivss %1, %0, %0"
+#else
+ #define ASM_INVALID "divss %0, %0"
+ #define ASM_DIVZERO "divss %1, %0"
+#endif
+
 #define FP_HANDLE_EXCEPTIONS                                           \
   do {                                                                 \
     if (_fex & FP_EX_INVALID)                                          \
       {                                                                        
\
        float f = 0.0;                                                  \
-       __asm__ __volatile__ ("divss %0, %0 " : : "x" (f));             \
+       __asm__ __volatile__ (ASM_INVALID : : "x" (f));                 \
       }                                                                        
\
     if (_fex & FP_EX_DIVZERO)                                          \
       {                                                                        
\
        float f = 1.0, g = 0.0;                                         \
-       __asm__ __volatile__ ("divss %1, %0" : : "x" (f), "x" (g));     \
+       __asm__ __volatile__ (ASM_DIVZERO : : "x" (f), "x" (g));        \
       }                                                                        
\
     if (_fex & FP_EX_OVERFLOW)                                         \
       {                                                                        
\