Fix expand_atomic_fetch_op wrt unused_result.

        * optabs.c (expand_atomic_fetch_op): Always return result.

From-SVN: r181750

gcc/ChangeLog

 2011-11-26  Richard Henderson  <rth@redhat.com>
 
+	* optabs.c (expand_atomic_fetch_op): Always return result.
+
 	* optabs.c (init_sync_libfuncs_1): Include max in iteration.
 
 	* omp-low.c (expand_omp_atomic): Assume anything aligned to

gcc/optabs.c

@@ -8068,7 +8068,7 @@ expand_atomic_fetch_op (rtx target, rtx mem, rtx val, enum rtx_code code,
 	{
 	  /* If the result isn't used, no need to do compensation code.  */
 	  if (unused_result)
-	    return target;
+	    return result;
 
 	  /* Issue compensation code.  Fetch_after  == fetch_before OP val.
 	     Fetch_before == after REVERSE_OP val.  */
@@ -8110,9 +8110,7 @@ expand_atomic_fetch_op (rtx target, rtx mem, rtx val, enum rtx_code code,
 	  result = emit_library_call_value (libfunc, NULL, LCT_NORMAL, mode,
 					    2, addr, ptr_mode, val, mode);
 
-	  if (unused_result)
-	    return target;
-	  if (fixup)
+	  if (!unused_result && fixup)
 	    result = expand_simple_binop (mode, code, result, val, target,
 					  true, OPTAB_LIB_WIDEN);
 	  return result;