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* 2.2% AEC overall speedup for the straight C path. * 2.4% AEC overall speedup for the SSE2 path. Review URL: https://webrtc-codereview.appspot.com/477002 git-svn-id: http://webrtc.googlecode.com/svn/trunk@1989 4adac7df-926f-26a2-2b94-8c16560cd09d