Index: src/atomic.h
==================================================================
--- src/atomic.h
+++ src/atomic.h
@@ -668,11 +668,10 @@
 	return false;
 #elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
 	int r;
 
 	__asm__ (
-	    "xorl	%0, %0\n\t"
 	    "lock\n\t"
 	    "cmpxchg	%2, %3\n\t"
 	    "sete	%b0\n\t"
 	    "movzbl	%b0, %0"
 	    : "=&d"(r)	/* use d instead of r due to gcc bug */
@@ -702,11 +701,10 @@
 	return false;
 #elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
 	int r;
 
 	__asm__ (
-	    "xorl	%0, %0\n\t"
 	    "lock\n\t"
 	    "cmpxchg	%2, %3\n\t"
 	    "sete	%b0\n\t"
 	    "movzbl	%b0, %0"
 	    : "=&d"(r)	/* use d instead of r due to gcc bug */
@@ -736,11 +734,10 @@
 	return false;
 #elif defined(OF_X86_ASM) || defined(OF_AMD64_ASM)
 	int r;
 
 	__asm__ (
-	    "xorl	%0, %0\n\t"
 	    "lock\n\t"
 	    "cmpxchg	%2, %3\n\t"
 	    "sete	%b0\n\t"
 	    "movzbl	%b0, %0"
 	    : "=&d"(r)	/* use d instead of r due to gcc bug */