d798095a37
The modification only uses the unique part of the spectrum (as is done for the C and asm code). It passes byte to byte conformance test, and the single function performance (if not specified, the code is compiled by GCC 4.6) on different platforms: | run 100k times | cortex-a7 | cortex-a9 | cortex-a15 | | use C as the base on each | (1.2Ghz) | (1.0Ghz) | (1.7Ghz) | | CPU target | | | | |----------------------------+-----------+-----------+------------| | C | 100% | 100% | 100% | | Neon asm | 18% | 14% | 19% | | Neon inline asm | 31% | 25% | 27% | | Neon intrinsic (GCC 4.6) | 33% | 27% | 42% | | Neon intrinscis (GCC 4.8) | 17% | 14% | 19% | | Neon intrinsics (LLVM 3.3) | 15% | 13% | 18% | BUG= R=andrew@webrtc.org Review URL: https://webrtc-codereview.appspot.com/13739004 Patch from Joe Yu <joe.yu@arm.com>. git-svn-id: http://webrtc.googlecode.com/svn/trunk@6920 4adac7df-926f-26a2-2b94-8c16560cd09d