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authorRich Felker <dalias@aerifal.cx>2011-04-27 12:19:49 -0400
committerRich Felker <dalias@aerifal.cx>2011-04-27 12:19:49 -0400
commit4bb9b4f3b4a6794da3091f58acbd938ff66fc15b (patch)
tree99bc7b287ccfe21f5f10dfa950be9ca598e2074c
parentb5b41212a686849fe061b8c4bb80d38f893d00c7 (diff)
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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.
-rw-r--r--arch/i386/atomic.h10
-rw-r--r--arch/x86_64/atomic.h10
2 files changed, 16 insertions, 4 deletions
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)
 {