Break out SSE functions into new media_sse target.

media/base/simd/vector_math_sse.cc

+// Copyright 2013 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.
+
+#include "media/base/vector_math_testing.h"
+
+#include <xmmintrin.h>  // NOLINT

[Mark Mentovai, 2013/03/05 21:32:31]

Is NOLINT needed for an #include line? You didn’t write NOLINT on other
#includes of <xmmintrin.h>.

[DaleCurtis, 2013/03/05 21:51:37]

PRESUBMIT doesn't recognize "vector_math_testing" as a valid main include since
"vector_math_sse" is not a subset of "vector_math_testing", but "sinc_resampler"
work since it is a subset of "sinc_resampler_sse".

https://code.google.com/p/chromium/codesearch#chromium/src/PRESUBMIT.py&l=544

+
+namespace media {
+namespace vector_math {
+
+void FMAC_SSE(const float src[], float scale, int len, float dest[]) {
+  const int rem = len % 4;
+  const int last_index = len - rem;
+  __m128 m_scale = _mm_set_ps1(scale);
+  for (int i = 0; i < last_index; i += 4) {
+    _mm_store_ps(dest + i, _mm_add_ps(_mm_load_ps(dest + i),
+                 _mm_mul_ps(_mm_load_ps(src + i), m_scale)));
+  }
+
+  // Handle any remaining values that wouldn't fit in an SSE pass.
+  for (int i = last_index; i < len; ++i)
+    dest[i] += src[i] * scale;
+}
+
+}  // namespace vector_math
+}  // namespace media