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-rw-r--r--mesalib/src/gallium/auxiliary/util/u_math.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_math.h b/mesalib/src/gallium/auxiliary/util/u_math.h
index 8f2ae2e17..b37d62175 100644
--- a/mesalib/src/gallium/auxiliary/util/u_math.h
+++ b/mesalib/src/gallium/auxiliary/util/u_math.h
@@ -477,10 +477,13 @@ float_to_byte_tex(float f)
static INLINE unsigned
util_logbase2(unsigned n)
{
- unsigned log2 = 0;
- while (n >>= 1)
- ++log2;
- return log2;
+ unsigned pos = 0;
+ if (n >= 1<<16) { n >>= 16; pos += 16; }
+ if (n >= 1<< 8) { n >>= 8; pos += 8; }
+ if (n >= 1<< 4) { n >>= 4; pos += 4; }
+ if (n >= 1<< 2) { n >>= 2; pos += 2; }
+ if (n >= 1<< 1) { pos += 1; }
+ return pos;
}