movbe instruction detect

BUG=none
TEST=cpu unittest
Review URL: https://webrtc-codereview.appspot.com/1027005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@527 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 526
+Version: 527
 License: BSD
 License File: LICENSE
 

include/libyuv/cpu_id.h

@@ -34,6 +34,7 @@ static const int kCpuHasSSE41 = 0x80;
 static const int kCpuHasSSE42 = 0x100;
 static const int kCpuHasAVX = 0x200;
 static const int kCpuHasAVX2 = 0x400;
+static const int kCpuHasMOVBE = 0x800;  // For test purposes.
 
 // These flags are only valid on MIPS processors.
 static const int kCpuHasMIPS = 0x1000;

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 526
+#define LIBYUV_VERSION 527
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/cpu_id.cc

@@ -162,6 +162,7 @@ int InitCpuFlags(void) {
               ((cpu_info[2] & 0x00000200) ? kCpuHasSSSE3 : 0) |
               ((cpu_info[2] & 0x00080000) ? kCpuHasSSE41 : 0) |
               ((cpu_info[2] & 0x00100000) ? kCpuHasSSE42 : 0) |
+              ((cpu_info[2] & 0x00400000) ? kCpuHasMOVBE : 0) |
               (((cpu_info[2] & 0x18000000) == 0x18000000) ? kCpuHasAVX : 0) |
               kCpuHasX86;
 #ifdef HAS_XGETBV
@@ -189,6 +190,9 @@ int InitCpuFlags(void) {
   if (TestEnv("LIBYUV_DISABLE_SSE42")) {
     cpu_info_ &= ~kCpuHasSSE42;
   }
+  if (TestEnv("LIBYUV_DISABLE_MOVBE")) {
+    cpu_info_ &= ~kCpuHasMOVBE;
+  }
   if (TestEnv("LIBYUV_DISABLE_AVX")) {
     cpu_info_ &= ~kCpuHasAVX;
   }

unit_test/cpu_test.cc

@@ -35,6 +35,8 @@ TEST_F(libyuvTest, TestCpuHas) {
   printf("Has SSE4.1 %x\n", has_sse41);
   int has_sse42 = TestCpuFlag(kCpuHasSSE42);
   printf("Has SSE4.2 %x\n", has_sse42);
+  int has_movbe = TestCpuFlag(kCpuHasMOVBE);
+  printf("Has MOVBE %x\n", has_movbe);
   int has_avx = TestCpuFlag(kCpuHasAVX);
   printf("Has AVX %x\n", has_avx);
   int has_avx2 = TestCpuFlag(kCpuHasAVX2);