[x86] Disable AVX on Mac OS X 10.9.

src/ia32/assembler-ia32.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 16 matching lines @@
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 // OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // The original source code covered by the above license above has been modified
 // significantly by Google Inc.
 // Copyright 2012 the V8 project authors. All rights reserved.
 
-#include "src/v8.h"
+#include "src/ia32/assembler-ia32.h"
+
+#if V8_OS_MACOSX
+#include <sys/sysctl.h>
+#endif
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/base/cpu.h"
 #include "src/disassembler.h"
 #include "src/macro-assembler.h"
-#include "src/serialize.h"
+#include "src/v8.h"
 
 namespace v8 {
 namespace internal {
 
 // -----------------------------------------------------------------------------
 // Implementation of CpuFeatures
 
+namespace {
+
+bool EnableAVX() {
+#if V8_OS_MACOSX
+  // Mac OS X 10.9 has a bug where AVX transitions were indeed being caused by
+  // ISRs, so we detect Mac OS X 10.9 here and disable AVX in that case.
+  char buffer[128];
+  size_t buffer_size = arraysize(buffer);
+  int ctl_name[] = { CTL_KERN , KERN_OSRELEASE };
+  if (sysctl(ctl_name, 2, buffer, &buffer_size, nullptr, 0) != 0) {
+    V8_Fatal(__FILE__, __LINE__, "V8 failed to get kernel version");
+  }
+  // The buffer now contains a string of the form XX.YY.ZZ, where
+  // XX is the major kernel version component. 13.x.x (Mavericks) is
+  // affected by this bug, so disable AVX there.
+  if (memcmp(buffer, "13.", 3) == 0) return false;
+#endif  // V8_OS_MACOSX
+  return FLAG_enable_avx;
+}
+
+}  // namespace
+
+
 void CpuFeatures::ProbeImpl(bool cross_compile) {
   base::CPU cpu;
   CHECK(cpu.has_sse2());  // SSE2 support is mandatory.
   CHECK(cpu.has_cmov());  // CMOV support is mandatory.
 
   // Only use statically determined features for cross compile (snapshot).
   if (cross_compile) return;
 
   if (cpu.has_sse41() && FLAG_enable_sse4_1) supported_ |= 1u << SSE4_1;
   if (cpu.has_sse3() && FLAG_enable_sse3) supported_ |= 1u << SSE3;
-  if (cpu.has_avx() && FLAG_enable_avx) supported_ |= 1u << AVX;
+  if (cpu.has_avx() && EnableAVX()) supported_ |= 1u << AVX;
   if (cpu.has_fma3() && FLAG_enable_fma3) supported_ |= 1u << FMA3;
 }
 
 
 void CpuFeatures::PrintTarget() { }
 void CpuFeatures::PrintFeatures() {
   printf("SSE3=%d SSE4_1=%d AVX=%d FMA3=%d\n", CpuFeatures::IsSupported(SSE3),
          CpuFeatures::IsSupported(SSE4_1), CpuFeatures::IsSupported(AVX),
          CpuFeatures::IsSupported(FMA3));
 }
@@ skipping 2671 matching lines @@
     fprintf(coverage_log, "%s\n", file_line);
     fflush(coverage_log);
   }
 }
 
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32