commit f0a964dc0a287469c68ca4fd195f95aaf24be45f
author kma@webrtc.org <kma@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> Wed Dec 14 18:59:43 2011
committer kma@webrtc.org <kma@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> Wed Dec 14 18:59:43 2011
tree 47eaa079d56b7b4f3aa7da97f68f42fa7f53fc22
parent 02afbeaca5844dcbf680fb7fe650698708bbee1f

Optimized WebRtcIsacfix_NormLatticeFilterMa() function for iSAC fix for ARM Neon
architecture with intrinsics and assembly code. The total iSAC codec speech improved
about 3~5%.

Notes
(1) The Neon version after this optimization is not bit-exact with the generic
C version. The out quality, however, is not worse as verified by test vectors ouput,
and undertandably in theory (32bit x 32bit in Neon is more accurate than the approximation
C code in the generic version).
(2) In Android, a isac neon library will be built. Along with some new function structures,
it is partly for preparation of introducing a run time detection of Neon architecture soon.
Review URL: http://webrtc-codereview.appspot.com/268016

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1192 4adac7df-926f-26a2-2b94-8c16560cd09d