Experiment with AVX optimizations for FMAC, FMUL operations.

media/base/sinc_resampler.h

Index: media/base/sinc_resampler.h
diff --git a/media/base/sinc_resampler.h b/media/base/sinc_resampler.h
index afbd2abc9cc4e6513b7b8ebbefd2db0457652e34..6b3568899f25a28f9b9059f88846cf17d844b903 100644
--- a/media/base/sinc_resampler.h
+++ b/media/base/sinc_resampler.h
@@ -13,6 +13,7 @@
 #include "base/memory/aligned_memory.h"
 #include "build/build_config.h"
 #include "media/base/media_export.h"
+#include "media/base/vector_math.h"
 
 namespace media {
 
@@ -21,9 +22,9 @@ class MEDIA_EXPORT SincResampler {
  public:
   enum {
     // The kernel size can be adjusted for quality (higher is better) at the
-    // expense of performance.  Must be a multiple of 32.
-    // TODO(dalecurtis): Test performance to see if we can jack this up to 64+.
-    kKernelSize = 32,
+    // expense of performance.  For performance we use the same kernel size
+    // as the SIMD optimized Convolve() operation.
+    kKernelSize = vector_math::kKernelSize,
 
     // Default request size.  Affects how often and for how much SincResampler
     // calls back for input.  Must be greater than kKernelSize.
@@ -84,28 +85,9 @@ class MEDIA_EXPORT SincResampler {
   double BufferedFrames() const;
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(SincResamplerTest, Convolve);
-  FRIEND_TEST_ALL_PREFIXES(SincResamplerPerfTest, Convolve);
-
   void InitializeKernel();
   void UpdateRegions(bool second_load);
 
-  // Compute convolution of |k1| and |k2| over |input_ptr|, resultant sums are
-  // linearly interpolated using |kernel_interpolation_factor|.  On x86, the
-  // underlying implementation is chosen at run time based on SSE support.  On
-  // ARM, NEON support is chosen at compile time based on compilation flags.
-  static float Convolve_C(const float* input_ptr, const float* k1,
-                          const float* k2, double kernel_interpolation_factor);
-#if defined(ARCH_CPU_X86_FAMILY)
-  static float Convolve_SSE(const float* input_ptr, const float* k1,
-                            const float* k2,
-                            double kernel_interpolation_factor);
-#elif defined(ARCH_CPU_ARM_FAMILY) && defined(USE_NEON)
-  static float Convolve_NEON(const float* input_ptr, const float* k1,
-                             const float* k2,
-                             double kernel_interpolation_factor);
-#endif
-
   // The ratio of input / output sample rates.
   double io_sample_rate_ratio_;