Check SSE and YMM state support for -march=native

	Backported from mainline

	PR target/54741
	*  config/i386/driver-i386.c (XCR_XFEATURE_ENABLED_MASK): New.
	(XSTATE_FP): Likewise.
	(XSTATE_SSE): Likewise.
	(XSTATE_YMM): Likewise.
	(host_detect_local_cpu): Disable AVX, AVX2, FMA, FMA4 and XOP if
	SSE and YMM states aren't supported.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_7-branch@192003 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 80ac744..05b4e8b 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,16 @@
+2012-10-02  H.J. Lu  <hongjiu.lu@intel.com>
+
+       Backported from mainline
+       2012-10-02  H.J. Lu  <hongjiu.lu@intel.com>
+
+       PR target/54741
+       *  config/i386/driver-i386.c (XCR_XFEATURE_ENABLED_MASK): New.
+       (XSTATE_FP): Likewise.
+       (XSTATE_SSE): Likewise.
+       (XSTATE_YMM): Likewise.
+       (host_detect_local_cpu): Disable AVX, AVX2, FMA, FMA4 and XOP if
+       SSE and YMM states aren't supported.
+
 2012-10-01  Tom de Vries  <tom@codesourcery.com>
 
        * var-tracking.c (set_dv_changed): Add an 'inline' function specifier to

diff --git a/gcc/config/i386/driver-i386.c b/gcc/config/i386/driver-i386.c
index 0c006a3..a233d3b 100644 (file)
--- a/gcc/config/i386/driver-i386.c
+++ b/gcc/config/i386/driver-i386.c
@@ -398,6 +398,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
   unsigned int has_fma = 0, has_fma4 = 0, has_xop = 0;
   unsigned int has_bmi = 0, has_bmi2 = 0, has_tbm = 0, has_lzcnt = 0;
   unsigned int has_rdrnd = 0, has_f16c = 0, has_fsgsbase = 0;
+  unsigned int has_osxsave = 0;
 
   bool arch;
 
@@ -439,6 +440,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
   has_sse4_1 = ecx & bit_SSE4_1;
   has_sse4_2 = ecx & bit_SSE4_2;
   has_avx = ecx & bit_AVX;
+  has_osxsave = ecx & bit_OSXSAVE;
   has_cmpxchg16b = ecx & bit_CMPXCHG16B;
   has_movbe = ecx & bit_MOVBE;
   has_popcnt = ecx & bit_POPCNT;
@@ -464,6 +466,26 @@ const char *host_detect_local_cpu (int argc, const char **argv)
       has_fsgsbase = ebx & bit_FSGSBASE;
     }
 
+  /* Get XCR_XFEATURE_ENABLED_MASK register with xgetbv.  */
+#define XCR_XFEATURE_ENABLED_MASK      0x0
+#define XSTATE_FP                      0x1
+#define XSTATE_SSE                     0x2
+#define XSTATE_YMM                     0x4
+  if (has_osxsave)
+    asm (".byte 0x0f; .byte 0x01; .byte 0xd0"
+        : "=a" (eax), "=d" (edx)
+        : "c" (XCR_XFEATURE_ENABLED_MASK));
+
+  /* Check if SSE and YMM states are supported.  */
+  if ((eax & (XSTATE_SSE | XSTATE_YMM)) == (XSTATE_SSE | XSTATE_YMM))
+    {
+      has_avx = 0;
+      has_avx2 = 0;
+      has_fma = 0;
+      has_fma4 = 0;
+      has_xop = 0;
+    }
+
   /* Check cpuid level of extended features.  */
   __cpuid (0x80000000, ext_level, ebx, ecx, edx);