[PATCH,i386] Properly check xgetbv for zmm support.

[Ilya Tocar]

Hi,

Currently we don't check zmm/mask-registers related bits in xgetbv
output, when detecting native cpu. Patch below fixes it.
Bootstraps/passes make check.
Ok for trunk?

ChangeLog:

gcc/
2014-09-15  Ilya Tocar  <ilya.to...@intel.com>

        * config/i386/driver-i386.c (host_detect_local_cpu): Detect lack of 
        zmm/k regs support.

testsuite/
2014-09-15  Ilya Tocar  <ilya.to...@intel.com>

        * gcc.target/i386/avx512f-os-support.h: Remove magic number.

---
 gcc/config/i386/driver-i386.c                      | 17 +++++++++++++++++
 gcc/testsuite/gcc.target/i386/avx512f-os-support.h | 17 +++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/gcc/config/i386/driver-i386.c b/gcc/config/i386/driver-i386.c
index af3088e..4d6bf83 100644
--- a/gcc/config/i386/driver-i386.c
+++ b/gcc/config/i386/driver-i386.c
@@ -533,6 +533,9 @@ const char *host_detect_local_cpu (int argc, const char 
**argv)
 #define XSTATE_FP                      0x1
 #define XSTATE_SSE                     0x2
 #define XSTATE_YMM                     0x4
+#define XSTATE_OPMASK                  0x20
+#define XSTATE_ZMM                     0x40
+#define XSTATE_HI_ZMM                  0x80
   if (has_osxsave)
     asm (".byte 0x0f; .byte 0x01; .byte 0xd0"
         : "=a" (eax), "=d" (edx)
@@ -554,6 +557,20 @@ const char *host_detect_local_cpu (int argc, const char 
**argv)
       has_xsavec = 0;
     }
 
+  if (!has_osxsave
+      || (eax &
+         (XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | XSTATE_ZMM | 
XSTATE_HI_ZMM))
+         != (XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | XSTATE_ZMM | 
XSTATE_HI_ZMM))
+    {
+      has_avx512f = 0;
+      has_avx512er = 0;
+      has_avx512pf = 0;
+      has_avx512cd = 0;
+      has_avx512dq = 0;
+      has_avx512bw = 0;
+      has_avx512vl = 0;
+    }
+
   if (!arch)
     {
       if (vendor == signature_AMD_ebx
diff --git a/gcc/testsuite/gcc.target/i386/avx512f-os-support.h 
b/gcc/testsuite/gcc.target/i386/avx512f-os-support.h
index deefa5e..2f1ed03 100644
--- a/gcc/testsuite/gcc.target/i386/avx512f-os-support.h
+++ b/gcc/testsuite/gcc.target/i386/avx512f-os-support.h
@@ -1,10 +1,23 @@
 /* Check if the OS supports executing AVX512F instructions.  */
 
+#define XCR_XFEATURE_ENABLED_MASK      0x0
+
+#define XSTATE_FP      0x1
+#define XSTATE_SSE     0x2
+#define XSTATE_YMM     0x4
+#define XSTATE_OPMASK  0x20
+#define XSTATE_ZMM     0x40
+#define XSTATE_HI_ZMM  0x80
+
 static int
 avx512f_os_support (void)
 {
   unsigned int eax, edx;
+  unsigned int ecx = XCR_XFEATURE_ENABLED_MASK;
+  unsigned int mask = XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK
+                     | XSTATE_ZMM | XSTATE_HI_ZMM;
+
+  __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (ecx));
 
-  __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (0));
-  return (eax & 230) == 230;
+  return ((eax & mask) == mask);
 }
-- 
1.8.3.1