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| author | Brian <brian.paul@tungstengraphics.com> | 2008-11-09 10:15:32 -0700 |
|---|---|---|
| committer | Brian <brian.paul@tungstengraphics.com> | 2008-11-09 10:17:43 -0700 |
| commit | 325cbeb29a63e3d71da00baeab864970fe3aa595 (patch) | |
| tree | c7a63e26acb56b146dfb0c66995b19fff30a656a /doxygen | |
| parent | 7e8315701945ec807b2b5a9d01250b5ab74ae183 (diff) | |
util: Fix util_fast_pow/exp2/log2.
- Use a lookup table for log2.
- Compute (float) (1 << ipart) by tweaking with the exponent directly to
avoid integer overflow and float conversion.
- Also table negative exponents to avoid float division and branching.
- Implement util_fast_exp as function of util_fast_exp2.
--------
Cherry-picked from gallium-0.2: 8415d06d90a197e16554dab98d160334fd9f9f93
This fixes some pow() glitches seen in fslight.c, spectex.c, etc.
Conflicts:
src/gallium/auxiliary/util/u_math.h
Diffstat (limited to 'doxygen')
0 files changed, 0 insertions, 0 deletions