diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index def7f2c3ac..e3075ab892 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,10 @@
+2012-05-02  Paul Pluzhnikov  <ppluzhnikov@google.com>
+
+	* sysdeps/i386/pthread_spin_lock.S: New.
+	* sysdeps/i386/pthread_spin_lock.c: Delete.
+	* sysdeps/x86_64/pthread_spin_lock.S: New.
+	* sysdeps/x86_64/pthread_spin_lock.c: Delete.
+
 2012-04-28  Andreas Schwab  <schwab@linux-m68k.org>
 
 	* Makefile ($(objpfx)tst-stack3-mem, $(objpfx)tst-tls6.out): Don't
diff --git a/nptl/sysdeps/i386/pthread_spin_lock.c b/nptl/sysdeps/i386/pthread_spin_lock.S
similarity index 54%
rename from nptl/sysdeps/i386/pthread_spin_lock.c
rename to nptl/sysdeps/i386/pthread_spin_lock.S
index c059e0123a..ba9b18e492 100644
--- a/nptl/sysdeps/i386/pthread_spin_lock.c
+++ b/nptl/sysdeps/i386/pthread_spin_lock.S
@@ -1,6 +1,5 @@
-/* Copyright (C) 2002,2003,2004 Free Software Foundation, Inc.
+/* Copyright (C) 2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -16,33 +15,23 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include "pthreadP.h"
+#include <lowlevellock.h>
 
-#ifndef LOCK_PREFIX
-# ifdef UP
-#  define LOCK_PREFIX	/* nothing */
-# else
-#  define LOCK_PREFIX	"lock;"
-# endif
-#endif
+	.globl	pthread_spin_lock
+	.type	pthread_spin_lock,@function
+	.align	16
+pthread_spin_lock:
+	mov	4(%esp), %eax
+1:	LOCK
+	decl	0(%eax)
+	jne	2f
+	xor	%eax, %eax
+	ret
 
-
-int
-pthread_spin_lock (lock)
-     pthread_spinlock_t *lock;
-{
-  asm ("\n"
-       "1:\t" LOCK_PREFIX "decl %0\n\t"
-       "jne 2f\n\t"
-       ".subsection 1\n\t"
-       ".align 16\n"
-       "2:\trep; nop\n\t"
-       "cmpl $0, %0\n\t"
-       "jg 1b\n\t"
-       "jmp 2b\n\t"
-       ".previous"
-       : "=m" (*lock)
-       : "m" (*lock));
-
-  return 0;
-}
+	.align	16
+2:	rep
+	nop
+	cmpl	$0, 0(%eax)
+	jg	1b
+	jmp	2b
+	.size	pthread_spin_lock,.-pthread_spin_lock
diff --git a/nptl/sysdeps/x86_64/pthread_spin_lock.S b/nptl/sysdeps/x86_64/pthread_spin_lock.S
new file mode 100644
index 0000000000..5e3431c903
--- /dev/null
+++ b/nptl/sysdeps/x86_64/pthread_spin_lock.S
@@ -0,0 +1,36 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <lowlevellock.h>
+	
+	.globl	pthread_spin_lock
+	.type	pthread_spin_lock,@function
+	.align	16
+pthread_spin_lock:
+1:	LOCK
+	decl	0(%rdi)
+	jne	2f
+	xor	%eax, %eax
+	ret
+
+	.align	16
+2:	rep
+	nop
+	cmpl	$0, 0(%rdi)
+	jg	1b
+	jmp	2b
+	.size	pthread_spin_lock,.-pthread_spin_lock
diff --git a/nptl/sysdeps/x86_64/pthread_spin_lock.c b/nptl/sysdeps/x86_64/pthread_spin_lock.c
deleted file mode 100644
index 7cf0e0ecce..0000000000
--- a/nptl/sysdeps/x86_64/pthread_spin_lock.c
+++ /dev/null
@@ -1 +0,0 @@
-#include "../i386/pthread_spin_lock.c"