Index: tests/references.cfa
===================================================================
--- tests/references.cfa	(revision 78cdb060aebec67f15c7fd9fe672626963efe0b5)
+++ tests/references.cfa	(revision e71c1d42d8496ccd3b54a96f7ca5013bba8d0198)
@@ -124,6 +124,6 @@
 		int *p = &a;
 		asm (
-			"incl %[p]\n\t" :
-			: [p] "m" (*p)
+			"incl %[p]\n\t"
+			: [p] "+m" (*p)
 		);
 		printf("%d\n", a);