Don't duplicate OS::CpuFeaturesImpliedByPlatform for every POSIX platform.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/20179004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15873 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/platform-cygwin.cc

@@ -55,11 +55,6 @@ namespace internal {
 static Mutex* limit_mutex = NULL;
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  return 0;  // Nothing special about Cygwin.
-}
-
-
 int OS::ActivationFrameAlignment() {
   // With gcc 4.4 the tree vectorization optimizer can generate code
   // that requires 16 byte alignment such as movdqa on x86.

src/platform-freebsd.cc

@@ -66,11 +66,6 @@ namespace internal {
 static Mutex* limit_mutex = NULL;
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  return 0;  // FreeBSD runs on anything.
-}
-
-
 int OS::ActivationFrameAlignment() {
   // 16 byte alignment on FreeBSD
   return 16;

src/platform-linux.cc

@@ -79,11 +79,6 @@ namespace internal {
 static Mutex* limit_mutex = NULL;
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  return 0;  // Linux runs on anything.
-}
-
-
 #ifdef __arm__
 static bool CPUInfoContainsString(const char * search_string) {
   const char* file_name = "/proc/cpuinfo";

src/platform-macos.cc

@@ -231,14 +231,6 @@ void OS::SignalCodeMovingGC() {
 }
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  // MacOSX requires all these to install so we can assume they are present.
-  // These constants are defined by the CPUid instructions.
-  const uint64_t one = 1;
-  return (one << SSE2) | (one << CMOV) | (one << RDTSC) | (one << CPUID);
-}
-
-
 int OS::ActivationFrameAlignment() {
   // OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI
   // Function Call Guide".

src/platform-openbsd.cc

@@ -91,11 +91,6 @@ static void* GetRandomMmapAddr() {
 }
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  return 0;
-}
-
-
 int OS::ActivationFrameAlignment() {
   // With gcc 4.4 the tree vectorization optimizer can generate code
   // that requires 16 byte alignment such as movdqa on x86.

src/platform-posix.cc

@@ -78,6 +78,18 @@ namespace internal {
 static const pthread_t kNoThread = (pthread_t) 0;
 
 
+uint64_t OS::CpuFeaturesImpliedByPlatform() {
+#if defined(__APPLE__)
+  // Mac OS X requires all these to install so we can assume they are present.
+  // These constants are defined by the CPUid instructions.
+  const uint64_t one = 1;
+  return (one << SSE2) | (one << CMOV) | (one << RDTSC) | (one << CPUID);
+#else
+  return 0;  // Nothing special about the other systems.
+#endif
+}
+
+
 // Maximum size of the virtual memory.  0 means there is no artificial
 // limit.
 

src/platform-solaris.cc

@@ -84,11 +84,6 @@ namespace internal {
 static Mutex* limit_mutex = NULL;
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  return 0;  // Solaris runs on a lot of things.
-}
-
-
 int OS::ActivationFrameAlignment() {
   // GCC generates code that requires 16 byte alignment such as movdqa.
   return Max(STACK_ALIGN, 16);