add word-sized ctz function to atomic.h

[musl] / arch / x86_64 / atomic.h

diff --git a/arch/x86_64/atomic.h b/arch/x86_64/atomic.h
index 04f6c28..3235db1 100644 (file)
--- a/arch/x86_64/atomic.h
+++ b/arch/x86_64/atomic.h
@@ -1,5 +1,5 @@
-#ifndef _INTERNAA_ATOMIC_H
-#define _INTERNAA_ATOMIC_H
+#ifndef _INTERNAL_ATOMIC_H
+#define _INTERNAL_ATOMIC_H
 
 #include <stdint.h>
 
@@ -10,6 +10,12 @@ static inline int a_ctz_64(uint64_t x)
        return r;
 }
 
+static inline int a_ctz_l(unsigned long x)
+{
+       long r;
+       __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
+       return r;
+}
 
 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
 {