[PATCH, testsuite]: Check AVX OS support.

[Uros Bizjak]

Hello!

2011-07-27  Uros Bizjak  <ubiz...@gmail.com>

        * gcc.target/i386/avx-os-support.h: New.
        * gcc.target/i386/avx-check.h: Include avx-os-support.h
        (main): Check avx_os_support before the test is run.
        * gcc.target/i386/aes-avx-check.h: Ditto.
        * gcc.target/i386/pclmul-avx-check.h: Ditto.

Tested on x86_64-pc-linux-gnu, will be commit to mainline and release branches.

Uros.

Index: gcc.target/i386/avx-check.h
===================================================================
--- gcc.target/i386/avx-check.h (revision 176816)
+++ gcc.target/i386/avx-check.h (working copy)
@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include "cpuid.h"
 #include "m256-check.h"
+#include "avx-os-support.h"
 
 static void avx_test (void);
 
@@ -20,7 +21,8 @@ main ()
     return 0;
 
   /* Run AVX test only if host has AVX support.  */
-  if ((ecx & (bit_AVX | bit_OSXSAVE)) == (bit_AVX | bit_OSXSAVE))
+  if (((ecx & (bit_AVX | bit_OSXSAVE)) == (bit_AVX | bit_OSXSAVE))
+      && avx_os_support ())
     {
       do_test ();
 #ifdef DEBUG
Index: gcc.target/i386/aes-avx-check.h
===================================================================
--- gcc.target/i386/aes-avx-check.h     (revision 176816)
+++ gcc.target/i386/aes-avx-check.h     (working copy)
@@ -3,6 +3,7 @@
 #endif
 #include <stdlib.h>
 #include "cpuid.h"
+#include "avx-os-support.h"
 
 static void aes_avx_test (void);
 
@@ -22,8 +23,9 @@ main ()
     return 0;
 
   /* Run AES + AVX test only if host has AES + AVX support.  */
-  if ((ecx & (bit_AVX | bit_OSXSAVE | bit_AES))
-      == (bit_AVX | bit_OSXSAVE | bit_AES))
+  if (((ecx & (bit_AVX | bit_OSXSAVE | bit_AES))
+       == (bit_AVX | bit_OSXSAVE | bit_AES))
+      && avx_os_support ())
     {
       do_test ();
 #ifdef DEBUG
Index: gcc.target/i386/avx-os-support.h
===================================================================
--- gcc.target/i386/avx-os-support.h    (revision 0)
+++ gcc.target/i386/avx-os-support.h    (revision 0)
@@ -0,0 +1,10 @@
+/* Check if the OS supports executing AVX instructions.  */
+
+static int
+avx_os_support (void)
+{
+  unsigned int eax, edx;
+
+  __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (0));
+  return (eax & 6) == 6;
+}
Index: gcc.target/i386/pclmul-avx-check.h
===================================================================
--- gcc.target/i386/pclmul-avx-check.h  (revision 176816)
+++ gcc.target/i386/pclmul-avx-check.h  (working copy)
@@ -3,6 +3,7 @@
 #endif
 #include <stdlib.h>
 #include "cpuid.h"
+#include "avx-os-support.h"
 
 static void pclmul_avx_test (void);
 
@@ -22,8 +23,9 @@ main ()
     return 0;
 
   /* Run PCLMUL + AVX test only if host has PCLMUL + AVX support.  */
-  if ((ecx & (bit_AVX | bit_OSXSAVE | bit_PCLMUL))
-      == (bit_AVX | bit_OSXSAVE | bit_PCLMUL))
+  if (((ecx & (bit_AVX | bit_OSXSAVE | bit_PCLMUL))
+       == (bit_AVX | bit_OSXSAVE | bit_PCLMUL))
+      && avx_os_support ())
     {
       do_test ();
 #ifdef DEBUG