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authorJakub Stachowski <qbast@go2.pl>2012-08-11 16:31:02 +0200
committerMartin Storsjo <martin@martin.st>2012-08-14 23:48:55 +0300
commite036dbc8eb7d5fdd02dc70faff20e9ac3e2989ca (patch)
treed6d9f180841062d409dcf8bb3fe8b0e3027730c0 /libAACdec/src/aacdec_drc.cpp
parent6999980d671f70fdae19c8b4663efa5189f9ca6c (diff)
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Use __builtin_clz instead of default implementation of fixnormz on GCC
The library contains architecture specific versions of the clz functions for arm and mips, but the fallback C version for other architectures is pretty slow. By using __builtin_clz on GCC (available since GCC 3.4), we get a significant (20-40 %) speedup of the total running time on x86. Speed difference: 5.1 s instead of 8.6 s for AAC-LC 128 kbit/s and 3.8 s instead of 4.9 s for HE-AACv2 32 kbit/s, on an i7.
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