From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 27 Apr 2011 16:19:49 +0000 (-0400)
Subject: add word-sized ctz function to atomic.h
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=4bb9b4f3b4a6794da3091f58acbd938ff66fc15b;p=musl

add word-sized ctz function to atomic.h

strictly speaking this and a few other ops should be factored into
asm.h or the file should just be renamed to asm.h, but whatever. clean
it up someday.
---

diff --git a/arch/i386/atomic.h b/arch/i386/atomic.h
index bf3c336e..66059af9 100644
--- a/arch/i386/atomic.h
+++ b/arch/i386/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>
 
@@ -11,6 +11,12 @@ 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)
 {
diff --git a/arch/x86_64/atomic.h b/arch/x86_64/atomic.h
index 04f6c28d..3235db16 100644
--- 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)
 {