[Patch] The comparison in a compare exchange should not take place in VOIDmode

gcc/

	* builtins.c (expand_builtin_atomic_compare_exchange): Call
	emit_cmp_and_jump_insns with the mode of target.

From-SVN: r224148

gcc/ChangeLog

+2015-06-05  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* builtins.c (expand_builtin_atomic_compare_exchange): Call
+	emit_cmp_and_jump_insns with the mode of target.
+
 2015-06-05  Venkataramanan Kumar  <venkataramanan.kumar@amd.com>
 
 	* config/i386/sse.md (sse3_mwait): Swap the operand constriants.

gcc/builtins.c

@@ -5471,7 +5471,8 @@ expand_builtin_atomic_compare_exchange (machine_mode mode, tree exp,
      the normal case where EXPECT is totally private, i.e. a register.  At
      which point the store can be unconditional.  */
   label = gen_label_rtx ();
-  emit_cmp_and_jump_insns (target, const0_rtx, NE, NULL, VOIDmode, 1, label);
+  emit_cmp_and_jump_insns (target, const0_rtx, NE, NULL,
+			   GET_MODE (target), 1, label);
   emit_move_insn (expect, oldval);
   emit_label (label);