Revert:

	2016-05-30  Uros Bizjak  <ubizjak@gmail.com>

	* config/i386/sync.md (mfence_nosse): Use "lock orl $0, -4(%esp)".

From-SVN: r245577

gcc/ChangeLog

+2017-02-19  Uros Bizjak  <ubizjak@gmail.com>
+
+	Revert:
+	2016-05-30  Uros Bizjak  <ubizjak@gmail.com>
+
+	* config/i386/sync.md (mfence_nosse): Use "lock orl $0, -4(%esp)".
+
 2017-02-19  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR c++/69523

gcc/config/i386/sync.md

@@ -98,7 +98,7 @@
 	(unspec:BLK [(match_dup 0)] UNSPEC_MFENCE))
    (clobber (reg:CC FLAGS_REG))]
   "!(TARGET_64BIT || TARGET_SSE2)"
-  "lock{%;} or{l}\t{$0, -4(%%esp)|DWORD PTR [esp-4], 0}"
+  "lock{%;} or{l}\t{$0, (%%esp)|DWORD PTR [esp], 0}"
   [(set_attr "memory" "unknown")])
 
 (define_expand "mem_thread_fence"