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| author | Jakub Stachowski <qbast@go2.pl> | 2012-08-14 21:59:32 +0200 |
|---|---|---|
| committer | Martin Storsjo <martin@martin.st> | 2012-09-09 22:18:09 +0300 |
| commit | 923f3e95f3e332d26f03cf6782f0ab61596ceef2 (patch) | |
| tree | 597ad65496c9239a8c4a0d868bf053ced928fa4c | |
| parent | 50b1de17ac25b03827a80754eb3b7ac24478d03c (diff) | |
| download | fdk-aac-dabplus-923f3e95f3e332d26f03cf6782f0ab61596ceef2.tar.gz fdk-aac-dabplus-923f3e95f3e332d26f03cf6782f0ab61596ceef2.tar.bz2 fdk-aac-dabplus-923f3e95f3e332d26f03cf6782f0ab61596ceef2.zip | |
Do schur_div with a direct 64 bit division instead of a loop on x86
This speeds up HE-AACv2 encoding from 3.85 s to 3.42 s on a Core i7.
| -rw-r--r-- | libFDK/src/fixpoint_math.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libFDK/src/fixpoint_math.cpp b/libFDK/src/fixpoint_math.cpp index 000820c..7d5fbb5 100644 --- a/libFDK/src/fixpoint_math.cpp +++ b/libFDK/src/fixpoint_math.cpp @@ -443,6 +443,15 @@ FIXP_DBL sqrtFixp(FIXP_DBL op) *****************************************************************************/ +#if defined(__x86__) +FIXP_DBL schur_div(FIXP_DBL num, FIXP_DBL denum, INT count) +{ + INT64 tmp=(INT64)num<<31; + LONG div=(tmp/denum)>>(DFRACT_BITS-count); + return (FIXP_DBL)(div) << (DFRACT_BITS-count); +} + +#else FIXP_DBL schur_div(FIXP_DBL num, FIXP_DBL denum, INT count) { @@ -469,6 +478,7 @@ FIXP_DBL schur_div(FIXP_DBL num, FIXP_DBL denum, INT count) return (FIXP_DBL)(div << (DFRACT_BITS - count)); } +#endif #endif /* !defined(FUNCTION_schur_div) */ |