Experiment with AVX optimizations for FMAC, FMUL operations.

media/base/audio_bus.h

 // 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.
 
 #ifndef MEDIA_BASE_AUDIO_BUS_H_
 #define MEDIA_BASE_AUDIO_BUS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 13 matching lines @@
 // allocated and owned by the AudioBus or it is provided to one of the factory
 // methods. AudioBus guarantees that it allocates memory such that float array
 // for each channel is aligned by AudioBus::kChannelAlignment bytes and it
 // requires the same for memory passed to its Wrap...() factory methods.
 // TODO(chfremer): There are currently no unit tests involving CreateWrapper and
 // SetChannelData, so we need to add them.
 class MEDIA_EXPORT AudioBus {
  public:
   // Guaranteed alignment of each channel's data; use 16-byte alignment for easy
   // SSE optimizations.
-  enum { kChannelAlignment = 16 };
+  enum { kChannelAlignment = 32 };
 
   // Creates a new AudioBus and allocates |channels| of length |frames|.  Uses
   // channels() and frames_per_buffer() from AudioParameters if given.
   static std::unique_ptr<AudioBus> Create(int channels, int frames);
   static std::unique_ptr<AudioBus> Create(const AudioParameters& params);
 
   // Creates a new AudioBus with the given number of channels, but zero length.
   // Clients are expected to subsequently call SetChannelData() and set_frames()
   // to wrap externally allocated memory.
   static std::unique_ptr<AudioBus> CreateWrapper(int channels);
@@ skipping 275 matching lines @@
 
   AudioBusRefCounted(int channels, int frames);
   ~AudioBusRefCounted() override;
 
   DISALLOW_COPY_AND_ASSIGN(AudioBusRefCounted);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_BUS_H_