Break out SSE functions into new media_sse target.

media/base/vector_math.cc

 // Copyright (c) 2012 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.h"
 #include "media/base/vector_math_testing.h"
 
 #include "base/cpu.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 
-#if defined(ARCH_CPU_X86_FAMILY) && defined(__SSE__)
-#include <xmmintrin.h>
-#endif
-
 namespace media {
 namespace vector_math {
 
 void FMAC(const float src[], float scale, int len, float dest[]) {
   // Ensure |src| and |dest| are 16-byte aligned.
   DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(src) & (kRequiredAlignment - 1));
   DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(dest) & (kRequiredAlignment - 1));
 
   // Rely on function level static initialization to keep VectorFMACProc
   // selection thread safe.
   typedef void (*VectorFMACProc)(const float src[], float scale, int len,
                                  float dest[]);
-#if defined(ARCH_CPU_X86_FAMILY) && defined(__SSE__)
+#if defined(ARCH_CPU_X86_FAMILY)
   static const VectorFMACProc kVectorFMACProc =

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

#if defined(OS_MACOSX), you can use FMAC_SSE directly, with no need for
base::CPU().

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

Done w/ __SSE__.

       base::CPU().has_sse() ? FMAC_SSE : FMAC_C;
 #else
   static const VectorFMACProc kVectorFMACProc = FMAC_C;
 #endif
 
   return kVectorFMACProc(src, scale, len, dest);
 }
 
 void FMAC_C(const float src[], float scale, int len, float dest[]) {
   for (int i = 0; i < len; ++i)
     dest[i] += src[i] * scale;
 }
 
-#if defined(ARCH_CPU_X86_FAMILY) && defined(__SSE__)
-void FMAC_SSE(const float src[], float scale, int len, float dest[]) {
-  __m128 m_scale = _mm_set_ps1(scale);
-  int rem = len % 4;
-  for (int i = 0; i < len - rem; 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.
-  if (rem)
-    FMAC_C(src + len - rem, scale, rem, dest + len - rem);
-}
-#endif
-
 }  // namespace vector_math
 }  // namespace media