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Diffstat (limited to 'src/gallium/auxiliary/util/u_math.h')
| -rw-r--r-- | src/gallium/auxiliary/util/u_math.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h index 4047bd9b016..607fbecb02f 100644 --- a/src/gallium/auxiliary/util/u_math.h +++ b/src/gallium/auxiliary/util/u_math.h @@ -482,12 +482,16 @@ unsigned ffs( unsigned u ) */ static INLINE unsigned util_last_bit(unsigned u) { +#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) + return u == 0 ? 0 : 32 - __builtin_clz(u); +#else unsigned r = 0; while (u) { r++; u >>= 1; } return r; +#endif } |