Resubmit - Rewrite color space conversions suite using YASM"

media/base/simd/filter_yuv_mmx.cc

Index: media/base/simd/filter_yuv_mmx.cc
diff --git a/media/base/simd/filter_yuv_mmx.cc b/media/base/simd/filter_yuv_mmx.cc
new file mode 100644
index 0000000000000000000000000000000000000000..77698dcb6574a3067d9f5efb3971f2db30e58e97
--- /dev/null
+++ b/media/base/simd/filter_yuv_mmx.cc
@@ -0,0 +1,58 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if defined(_MSC_VER)
+#include <intrin.h>
+#else
+#include <mmintrin.h>
+#include <emmintrin.h>
+#endif
+
+#include "build/build_config.h"
+#include "media/base/simd/filter_yuv.h"
+
+namespace media {
+
+#if defined(COMPILER_MSVC)
+// Warning 4799 is about calling emms before the function exits.
+// We calls emms in a frame level so suppress this warning.
+#pragma warning(disable: 4799)
+#endif
+
+void FilterYUVRows_MMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
+                       int source_width, int source_y_fraction) {
+  __m64 zero = _mm_setzero_si64();
+  __m64 y1_fraction = _mm_set1_pi16(source_y_fraction);
+  __m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction);
+
+  const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr);
+  const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr);
+  __m64* dest64 = reinterpret_cast<__m64*>(ybuf);
+  __m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width);
+
+  do {
+    __m64 y0 = *y0_ptr64++;
+    __m64 y1 = *y1_ptr64++;
+    __m64 y2 = _mm_unpackhi_pi8(y0, zero);
+    __m64 y3 = _mm_unpackhi_pi8(y1, zero);
+    y0 = _mm_unpacklo_pi8(y0, zero);
+    y1 = _mm_unpacklo_pi8(y1, zero);
+    y0 = _mm_mullo_pi16(y0, y0_fraction);
+    y1 = _mm_mullo_pi16(y1, y1_fraction);
+    y2 = _mm_mullo_pi16(y2, y0_fraction);
+    y3 = _mm_mullo_pi16(y3, y1_fraction);
+    y0 = _mm_add_pi16(y0, y1);
+    y2 = _mm_add_pi16(y2, y3);
+    y0 = _mm_srli_pi16(y0, 8);
+    y2 = _mm_srli_pi16(y2, 8);
+    y0 = _mm_packs_pu16(y0, y2);
+    *dest64++ = y0;
+  } while (dest64 < end64);
+}
+
+#if defined(COMPILER_MSVC)
+#pragma warning(default: 4799)
+#endif
+
+}  // namespace media