From patchwork Mon Aug 22 23:13:09 2011
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Subject: [i386] : Use AVX FP instructions in libgcc soft-fp exception handler
Date: Mon, 22 Aug 2011 13:13:09 -0000
From: Uros Bizjak <ubizjak@gmail.com>
X-Patchwork-Id: 111023
Message-Id: <CAFULd4awQyCMDOGSyQL0rtqx9uqPhd2MUCOT+ECi9AjoKbAqiw@mail.gmail.com>
To: gcc-patches@gcc.gnu.org

Hello!

2011-08-23  Uros Bizjak  <ubizjak@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)						\
       {									\