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authorRich Felker <dalias@aerifal.cx>2020-07-05 13:49:55 -0400
committerRich Felker <dalias@aerifal.cx>2020-07-05 13:51:50 -0400
commit0a005f499cf39822166dd4db3d2d31f0639f1b1b (patch)
tree685e6646f2b13b18a45fab6e71dfc2a29fa9935d
parenta62df9c9b7cad47e62b293abeddaf3fcdf09d8ae (diff)
downloadmusl-master.tar.gz
fix C implementation of a_clz_32HEADmaster
this broke mallocng size_to_class on archs without a native implementation of a_clz_32. the incorrect logic seems to have been something i derived from a related but distinct log2-type operation. with the change made here, it passes an exhaustive test. as this function is new and presently only used by mallocng, no other functionality was affected.
-rw-r--r--src/internal/atomic.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/internal/atomic.h b/src/internal/atomic.h
index 99539cc0..96c1552d 100644
--- a/src/internal/atomic.h
+++ b/src/internal/atomic.h
@@ -319,7 +319,7 @@ static inline int a_clz_64(uint64_t x)
#define a_clz_32 a_clz_32
static inline int a_clz_32(uint32_t x)
{
- x--;
+ x >>= 1;
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;