glibc/glibc-rh801650-2.patch

commit 08cf777f9e7f6d826658a99c7d77a359f73a45bf
Author: Ulrich Drepper <drepper@gmail.com>
Date:   Thu Jan 26 09:45:54 2012 -0500

    Really fix AVX tests
    
    There is no problem with strcmp, it doesn't use the YMM registers.
    The math routines might since gcc perhaps generates such code.
    Introduce bit_YMM_USBALE and use it in the math routines.

 	[BZ #13583]
 	* sysdeps/x86_64/multiarch/init-arch.h: Define bit_OSXSAVE.
	Clean up HAS_* macros.
 	* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): If
	bit_AVX is set also check OSXAVE/XCR0 and set bit_YMM_Usable if
	possible.
	* sysdeps/x86_64/fpu/multiarch/e_atan2.c: Use HAS_YMM_USABLE, not
	HAS_AVX.
	* sysdeps/x86_64/fpu/multiarch/e_exp.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/e_log.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_atan.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_sin.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_tan.c: Likewise.
 
 2012-01-25  Joseph Myers  <joseph@codesourcery.com>
 
diff --git a/sysdeps/x86_64/fpu/multiarch/e_atan2.c b/sysdeps/x86_64/fpu/multiarch/e_atan2.c
index 6867c6e..3a615fc 100644
--- a/sysdeps/x86_64/fpu/multiarch/e_atan2.c
+++ b/sysdeps/x86_64/fpu/multiarch/e_atan2.c
@@ -14,7 +14,7 @@ extern double __ieee754_atan2_fma4 (double, double);
 
 libm_ifunc (__ieee754_atan2,
 	    HAS_FMA4 ? __ieee754_atan2_fma4
-	    : (HAS_AVX ? __ieee754_atan2_avx : __ieee754_atan2_sse2));
+	    : (HAS_YMM_USABLE ? __ieee754_atan2_avx : __ieee754_atan2_sse2));
 strong_alias (__ieee754_atan2, __atan2_finite)
 
 # define __ieee754_atan2 __ieee754_atan2_sse2
diff --git a/sysdeps/x86_64/fpu/multiarch/e_exp.c b/sysdeps/x86_64/fpu/multiarch/e_exp.c
index 3c65028..7b2320a 100644
--- a/sysdeps/x86_64/fpu/multiarch/e_exp.c
+++ b/sysdeps/x86_64/fpu/multiarch/e_exp.c
@@ -14,7 +14,7 @@ extern double __ieee754_exp_fma4 (double);
 
 libm_ifunc (__ieee754_exp,
 	    HAS_FMA4 ? __ieee754_exp_fma4
-	    : (HAS_AVX ? __ieee754_exp_avx : __ieee754_exp_sse2));
+	    : (HAS_YMM_USABLE ? __ieee754_exp_avx : __ieee754_exp_sse2));
 strong_alias (__ieee754_exp, __exp_finite)
 
 # define __ieee754_exp __ieee754_exp_sse2
diff --git a/sysdeps/x86_64/fpu/multiarch/e_log.c b/sysdeps/x86_64/fpu/multiarch/e_log.c
index 3b468d0..ab277d6 100644
--- a/sysdeps/x86_64/fpu/multiarch/e_log.c
+++ b/sysdeps/x86_64/fpu/multiarch/e_log.c
@@ -14,7 +14,7 @@ extern double __ieee754_log_fma4 (double);
 
 libm_ifunc (__ieee754_log,
 	    HAS_FMA4 ? __ieee754_log_fma4
-	    : (HAS_AVX ? __ieee754_log_avx
+	    : (HAS_YMM_USABLE ? __ieee754_log_avx
 	       : __ieee754_log_sse2));
 strong_alias (__ieee754_log, __log_finite)
 
diff --git a/sysdeps/x86_64/fpu/multiarch/s_atan.c b/sysdeps/x86_64/fpu/multiarch/s_atan.c
index 3160201..78c7e09 100644
--- a/sysdeps/x86_64/fpu/multiarch/s_atan.c
+++ b/sysdeps/x86_64/fpu/multiarch/s_atan.c
@@ -12,7 +12,8 @@ extern double __atan_fma4 (double);
 #  define __atan_fma4 ((void *) 0)
 # endif
 
-libm_ifunc (atan, HAS_FMA4 ? __atan_fma4 : HAS_AVX ? __atan_avx : __atan_sse2);
+libm_ifunc (atan, (HAS_FMA4 ? __atan_fma4 :
+		   HAS_YMM_USABLE ? __atan_avx : __atan_sse2));
 
 # define atan __atan_sse2
 #endif
diff --git a/sysdeps/x86_64/fpu/multiarch/s_sin.c b/sysdeps/x86_64/fpu/multiarch/s_sin.c
index 1ba9dbc..417acd0 100644
--- a/sysdeps/x86_64/fpu/multiarch/s_sin.c
+++ b/sysdeps/x86_64/fpu/multiarch/s_sin.c
@@ -17,10 +17,12 @@ extern double __sin_fma4 (double);
 #  define __sin_fma4 ((void *) 0)
 # endif
 
-libm_ifunc (__cos, HAS_FMA4 ? __cos_fma4 : HAS_AVX ? __cos_avx : __cos_sse2);
+libm_ifunc (__cos, (HAS_FMA4 ? __cos_fma4 :
+		    HAS_YMM_USABLE ? __cos_avx : __cos_sse2));
 weak_alias (__cos, cos)
 
-libm_ifunc (__sin, HAS_FMA4 ? __sin_fma4 : HAS_AVX ? __sin_avx : __sin_sse2);
+libm_ifunc (__sin, (HAS_FMA4 ? __sin_fma4 :
+		    HAS_YMM_USABLE ? __sin_avx : __sin_sse2));
 weak_alias (__sin, sin)
 
 # define __cos __cos_sse2
diff --git a/sysdeps/x86_64/fpu/multiarch/s_tan.c b/sysdeps/x86_64/fpu/multiarch/s_tan.c
index 8f6601e..3047155 100644
--- a/sysdeps/x86_64/fpu/multiarch/s_tan.c
+++ b/sysdeps/x86_64/fpu/multiarch/s_tan.c
@@ -12,7 +12,8 @@ extern double __tan_fma4 (double);
 #  define __tan_fma4 ((void *) 0)
 # endif
 
-libm_ifunc (tan, HAS_FMA4 ? __tan_fma4 : HAS_AVX ? __tan_avx : __tan_sse2);
+libm_ifunc (tan, (HAS_FMA4 ? __tan_fma4 :
+		  HAS_YMM_USABLE ? __tan_avx : __tan_sse2));
 
 # define tan __tan_sse2
 #endif
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
index 4fabbee..76d146c 100644
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ b/sysdeps/x86_64/multiarch/init-arch.c
@@ -147,13 +147,13 @@ __init_cpu_features (void)
   if (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & bit_AVX)
     {
       /* Reset the AVX bit in case OSXSAVE is disabled.  */
-      if ((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & bit_OSXSAVE) == 0
-	  || ({ unsigned int xcrlow;
-	      unsigned int xcrhigh;
-	      asm ("xgetbv"
-		   : "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
-	      (xcrlow & 6) != 6; }))
-	__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx &= ~bit_AVX;
+      if ((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & bit_OSXSAVE) != 0
+	  && ({ unsigned int xcrlow;
+		unsigned int xcrhigh;
+		asm ("xgetbv"
+		     : "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
+		(xcrlow & 6) == 6; }))
+	__cpu_features.feature[index_YMM_Usable] |= bit_YMM_Usable;
     }
 
   __cpu_features.family = family;
diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h
index 408e5ae..2dc75ab 100644
--- a/sysdeps/x86_64/multiarch/init-arch.h
+++ b/sysdeps/x86_64/multiarch/init-arch.h
@@ -22,6 +22,7 @@
 #define bit_Prefer_SSE_for_memop	(1 << 3)
 #define bit_Fast_Unaligned_Load		(1 << 4)
 #define bit_Prefer_PMINUB_for_stringop	(1 << 5)
+#define bit_YMM_Usable			(1 << 6)
 
 #define bit_SSE2	(1 << 26)
 #define bit_SSSE3	(1 << 9)
@@ -49,6 +50,7 @@
 # define index_Prefer_SSE_for_memop	FEATURE_INDEX_1*FEATURE_SIZE
 # define index_Fast_Unaligned_Load	FEATURE_INDEX_1*FEATURE_SIZE
 # define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE
+# define index_YMM_Usable		FEATURE_INDEX_1*FEATURE_SIZE
 
 #else	/* __ASSEMBLER__ */
 
@@ -93,7 +95,7 @@ extern struct cpu_features
 
 
 extern void __init_cpu_features (void) attribute_hidden;
-#define INIT_ARCH()\
+# define INIT_ARCH() \
   do							\
     if (__cpu_features.kind == arch_kind_unknown)	\
       __init_cpu_features ();				\
@@ -126,23 +128,21 @@ extern const struct cpu_features *__get_cpu_features (void)
 # define index_Slow_BSF			FEATURE_INDEX_1
 # define index_Prefer_SSE_for_memop	FEATURE_INDEX_1
 # define index_Fast_Unaligned_Load	FEATURE_INDEX_1
+# define index_YMM_Usable		FEATURE_INDEX_1
 
-#define HAS_ARCH_FEATURE(idx, bit) \
-  ((__get_cpu_features ()->feature[idx] & (bit)) != 0)
+# define HAS_ARCH_FEATURE(name) \
+  ((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0)
 
-#define HAS_FAST_REP_STRING \
-  HAS_ARCH_FEATURE (index_Fast_Rep_String, bit_Fast_Rep_String)
+# define HAS_FAST_REP_STRING	HAS_ARCH_FEATURE (Fast_Rep_String)
 
-#define HAS_FAST_COPY_BACKWARD \
-  HAS_ARCH_FEATURE (index_Fast_Copy_Backward, bit_Fast_Copy_Backward)
+# define HAS_FAST_COPY_BACKWARD	HAS_ARCH_FEATURE (Fast_Copy_Backward)
 
-#define HAS_SLOW_BSF \
-  HAS_ARCH_FEATURE (index_Slow_BSF, bit_Slow_BSF)
+# define HAS_SLOW_BSF		HAS_ARCH_FEATURE (Slow_BSF)
 
-#define HAS_PREFER_SSE_FOR_MEMOP \
-  HAS_ARCH_FEATURE (index_Prefer_SSE_for_memop, bit_Prefer_SSE_for_memop)
+# define HAS_PREFER_SSE_FOR_MEMOP HAS_ARCH_FEATURE (Prefer_SSE_for_memop)
 
-#define HAS_FAST_UNALIGNED_LOAD \
-  HAS_ARCH_FEATURE (index_Fast_Unaligned_Load, bit_Fast_Unaligned_Load)
+# define HAS_FAST_UNALIGNED_LOAD HAS_ARCH_FEATURE (Fast_Unaligned_Load)
+
+# define HAS_YMM_USABLE		HAS_ARCH_FEATURE (YMM_Usable)
 
 #endif	/* __ASSEMBLER__ */