diff options
| author | Antonin Descampe <antonin@gmail.com> | 2005-01-03 17:39:30 +0000 |
|---|---|---|
| committer | Antonin Descampe <antonin@gmail.com> | 2005-01-03 17:39:30 +0000 |
| commit | bfb2f9f58bfa179785e9b67d21b2ea4d98d6ef8e (patch) | |
| tree | bf4e94858af861476899b3500b72b91ba4e393c9 /libopenjpeg | |
| parent | 13b8ecfe44e9d3f5b1a31626ed44099a0224dd01 (diff) | |
Luke Lee optimization for fix_mul... Thanks to him
Diffstat (limited to 'libopenjpeg')
| -rw-r--r-- | libopenjpeg/fix.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libopenjpeg/fix.c b/libopenjpeg/fix.c index 77ca6d63..4a5f91e6 100644 --- a/libopenjpeg/fix.c +++ b/libopenjpeg/fix.c @@ -43,6 +43,7 @@ //} //Mod Antonin : multbug1 +/* int fix_mul(int a, int b) { double tmp= (double) ((int64) a * (int64) b); @@ -50,5 +51,12 @@ int fix_mul(int a, int b) v = (tmp<0)?-v:v; return (int) v; } +*/ //doM +int fix_mul(int a, int b) // Luke Lee optimized : 11/16/2004 +{ + int64 temp = (int64) a * (int64) b >> 12; + return (int) ((temp >> 1) + (temp & 1)) ; +} + |