Index: /trunk/include/iprt/asm-amd64-x86.h
===================================================================
--- /trunk/include/iprt/asm-amd64-x86.h	(revision 31426)
+++ /trunk/include/iprt/asm-amd64-x86.h	(revision 31427)
@@ -917,5 +917,5 @@
                           "xchgl %%ebx,%1\n\t"
                           : "=a" (uSpill),
-                            "=r" (xBX)
+                            "=rm" (xBX)
                           : "0" (1)
                           : "ecx", "edx");