--- a/gcc/config/arm/aarch-common.c	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/config/arm/aarch-common.c	Thu Oct 25 07:37:49 2018 +0900
@@ -1,7 +1,7 @@
 /* Dependency checks for instruction scheduling, shared between ARM and
    AARCH64.
 
-   Copyright (C) 1991-2017 Free Software Foundation, Inc.
+   Copyright (C) 1991-2018 Free Software Foundation, Inc.
    Contributed by ARM Ltd.
 
    This file is part of GCC.
@@ -21,12 +21,15 @@
    <http://www.gnu.org/licenses/>.  */
 
 
+#define IN_TARGET_CODE 1
+
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
 #include "tm.h"
 #include "rtl.h"
 #include "rtl-iter.h"
+#include "memmodel.h"
 
 /* In ARMv8-A there's a general expectation that AESE/AESMC
    and AESD/AESIMC sequences of the form:
@@ -228,6 +231,28 @@
   return is_rev;
 }
 
+/* Return non-zero if the RTX representing a memory model is a memory model
+   that needs acquire semantics.  */
+bool
+aarch_mm_needs_acquire (rtx const_int)
+{
+  enum memmodel model = memmodel_from_int (INTVAL (const_int));
+  return !(is_mm_relaxed (model)
+	   || is_mm_consume (model)
+	   || is_mm_release (model));
+}
+
+/* Return non-zero if the RTX representing a memory model is a memory model
+   that needs release semantics.  */
+bool
+aarch_mm_needs_release (rtx const_int)
+{
+  enum memmodel model = memmodel_from_int (INTVAL (const_int));
+  return !(is_mm_relaxed (model)
+	   || is_mm_consume (model)
+	   || is_mm_acquire (model));
+}
+
 /* Return nonzero if the CONSUMER instruction (a load) does need
    PRODUCER's value to calculate the address.  */
 int