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-rw-r--r--src/internal/atomic.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/internal/atomic.h b/src/internal/atomic.h
index f938879b..99539cc0 100644
--- a/src/internal/atomic.h
+++ b/src/internal/atomic.h
@@ -315,4 +315,19 @@ static inline int a_clz_64(uint64_t x)
}
#endif
+#ifndef a_clz_32
+#define a_clz_32 a_clz_32
+static inline int a_clz_32(uint32_t x)
+{
+ x--;
+ x |= x >> 1;
+ x |= x >> 2;
+ x |= x >> 4;
+ x |= x >> 8;
+ x |= x >> 16;
+ x++;
+ return 31-a_ctz_32(x);
+}
+#endif
+
#endif