Set SAHF flag correctly in ia32

src/cpu.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cpu.h"
 
 #if V8_LIBC_MSVCRT
 #include <intrin.h>  // __cpuid()
 #endif
 #if V8_OS_POSIX
@@ skipping 282 matching lines @@
     has_cmov_ = (cpu_info[3] & 0x00008000) != 0;
     has_mmx_ = (cpu_info[3] & 0x00800000) != 0;
     has_sse_ = (cpu_info[3] & 0x02000000) != 0;
     has_sse2_ = (cpu_info[3] & 0x04000000) != 0;
     has_sse3_ = (cpu_info[2] & 0x00000001) != 0;
     has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
     has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
     has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
   }
 
+#if V8_HOST_ARCH_IA32
+  // SAHF is always available in compat/legacy mode,
+  has_sahf_ = true;
+#else
   // Query extended IDs.
   __cpuid(cpu_info, 0x80000000);
   unsigned num_ext_ids = cpu_info[0];
 
   // Interpret extended CPU feature information.
   if (num_ext_ids > 0x80000000) {
     __cpuid(cpu_info, 0x80000001);
-    // SAHF is always available in compat/legacy mode,
-    // but must be probed in long mode.
-#if V8_HOST_ARCH_IA32
-    has_sahf_ = true;
-#else
+    // SAHF must be probed in long mode.
     has_sahf_ = (cpu_info[2] & 0x00000001) != 0;
+  }
 #endif
-  }
 
 #elif V8_HOST_ARCH_ARM
 
 #if V8_OS_LINUX
 
   CPUInfo cpu_info;
 
   // Extract implementor from the "CPU implementer" field.
   char* implementer = cpu_info.ExtractField("CPU implementer");
   if (implementer != NULL) {
@@ skipping 174 matching lines @@
 #if V8_OS_WIN
   SYSTEM_INFO info;
   GetSystemInfo(&info);
   return info.dwNumberOfProcessors;
 #else
   return static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
 #endif
 }
 
 } }  // namespace v8::internal