Test DJB2 hash with half the buffer same.

BUG=none
TEST=libyuvTest.BenchmakDjb2_Test
Review URL: https://webrtc-codereview.appspot.com/1446004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@689 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 687
+Version: 688
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 687
+#define LIBYUV_VERSION 688
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

unit_test/compare_test.cc

@@ -30,6 +30,50 @@ static uint32 ReferenceHashDjb2(const uint8* src, uint64 count, uint32 seed) {
   return hash;
 }
 
+TEST_F(libyuvTest, Djb2_Test) {
+  const int kMaxTest = benchmark_width_ * benchmark_height_;
+  align_buffer_64(src_a, kMaxTest)
+  align_buffer_64(src_b, kMaxTest)
+
+  for (int i = 0; i < kMaxTest; ++i) {
+    src_a[i] = (random() & 0xff);
+    src_b[i] = (random() & 0xff);
+  }
+  // Compare different buffers. Expect hash is different.
+  uint32 h1 = HashDjb2(src_a, kMaxTest, 5381);
+  uint32 h2 = HashDjb2(src_b, kMaxTest, 5381);
+  EXPECT_NE(h1, h2);
+
+  // Make last half same. Expect hash is different.
+  memcpy(src_a + kMaxTest / 2, src_b + kMaxTest / 2, kMaxTest / 2);
+  h1 = HashDjb2(src_a, kMaxTest, 5381);
+  h2 = HashDjb2(src_b, kMaxTest, 5381);
+  EXPECT_NE(h1, h2);
+
+  // Make first half same. Expect hash is different.
+  memcpy(src_a + kMaxTest / 2, src_a, kMaxTest / 2);
+  memcpy(src_b + kMaxTest / 2, src_b, kMaxTest / 2);
+  memcpy(src_a, src_b, kMaxTest / 2);
+  h1 = HashDjb2(src_a, kMaxTest, 5381);
+  h2 = HashDjb2(src_b, kMaxTest, 5381);
+  EXPECT_NE(h1, h2);
+
+  // Make same. Expect hash is same.
+  memcpy(src_a, src_b, kMaxTest);
+  h1 = HashDjb2(src_a, kMaxTest, 5381);
+  h2 = HashDjb2(src_b, kMaxTest, 5381);
+  EXPECT_EQ(h1, h2);
+
+  // Mask seed different. Expect hash is different.
+  memcpy(src_a, src_b, kMaxTest);
+  h1 = HashDjb2(src_a, kMaxTest, 5381);
+  h2 = HashDjb2(src_b, kMaxTest, 1234);
+  EXPECT_NE(h1, h2);
+
+  free_aligned_buffer_64(src_a)
+  free_aligned_buffer_64(src_b)
+}
+
 TEST_F(libyuvTest, BenchmakDjb2_Opt) {
   const int kMaxTest = benchmark_width_ * benchmark_height_;
   align_buffer_64(src_a, kMaxTest)

util/Makefile

 psnr: psnr.cc ssim.cc psnr_main.cc
+ifeq ($(CXX),icl)
+	$(CXX) /arch:SSE2 /Ox /openmp psnr.cc ssim.cc psnr_main.cc
+else
 	$(CXX) -msse2 -O3 -fopenmp -static -o psnr psnr.cc ssim.cc psnr_main.cc -Wl,--strip-all
+endif