Replace OS::MemCopy with OS::MemMove (just as fast but more flexible).

src/atomicops_internals_x86_gcc.cc

 // Copyright 2010 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 13 matching lines @@
 // 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.
 
 // This module gets enough CPU information to optimize the
 // atomicops module on x86.
 
 #include <string.h>
 
 #include "atomicops.h"
+#include "platform.h"
 
 // This file only makes sense with atomicops_internals_x86_gcc.h -- it
 // depends on structs that are defined in that file.  If atomicops.h
 // doesn't sub-include that file, then we aren't needed, and shouldn't
 // try to do anything.
 #ifdef V8_ATOMICOPS_INTERNALS_X86_GCC_H_
 
 // Inline cpuid instruction.  In PIC compilations, %ebx contains the address
 // of the global offset table.  To avoid breaking such executables, this code
 // must preserve that register's value across cpuid instructions.
@@ skipping 33 matching lines @@
   using v8::internal::AtomicOps_Internalx86CPUFeatures;
 
   uint32_t eax;
   uint32_t ebx;
   uint32_t ecx;
   uint32_t edx;
 
   // Get vendor string (issue CPUID with eax = 0)
   cpuid(eax, ebx, ecx, edx, 0);
   char vendor[13];
-  memcpy(vendor, &ebx, 4);
-  memcpy(vendor + 4, &edx, 4);
-  memcpy(vendor + 8, &ecx, 4);
+  v8::internal::OS::MemCopy(vendor, &ebx, 4);
+  v8::internal::OS::MemCopy(vendor + 4, &edx, 4);
+  v8::internal::OS::MemCopy(vendor + 8, &ecx, 4);
   vendor[12] = 0;
 
   // get feature flags in ecx/edx, and family/model in eax
   cpuid(eax, ebx, ecx, edx, 1);
 
   int family = (eax >> 8) & 0xf;        // family and model fields
   int model = (eax >> 4) & 0xf;
   if (family == 0xf) {                  // use extended family and model fields
     family += (eax >> 20) & 0xff;
     model += ((eax >> 16) & 0xf) << 4;
@@ skipping 24 matching lines @@
 };
 
 // A global to get use initialized on startup via static initialization :/
 AtomicOpsx86Initializer g_initer;
 
 }  // namespace
 
 #endif  // if x86
 
 #endif  // ifdef V8_ATOMICOPS_INTERNALS_X86_GCC_H_