semaphores: fix missed wakes from ABA bug in waiter count logic

[musl] / arch / x32 / atomic_arch.h

diff --git a/arch/x32/atomic_arch.h b/arch/x32/atomic_arch.h
index 7daf4ae..918c2d4 100644 (file)
--- a/arch/x32/atomic_arch.h
+++ b/arch/x32/atomic_arch.h
@@ -106,9 +106,16 @@ static inline int a_ctz_64(uint64_t x)
        return x;
 }
 
-#define a_ctz_l a_ctz_l
-static inline int a_ctz_l(unsigned long x)
+#define a_ctz_32 a_ctz_32
+static inline int a_ctz_32(uint32_t x)
 {
        __asm__( "bsf %1,%0" : "=r"(x) : "r"(x) );
        return x;
 }
+
+#define a_clz_64 a_clz_64
+static inline int a_clz_64(uint64_t x)
+{
+       __asm__( "bsr %1,%0 ; xor $63,%0" : "=r"(x) : "r"(x) );
+       return x;
+}