[Patch ARM] Fix PR target/81863

This has been in my patch stack for quite some time. The problem here
was that we weren't handling arm_word_relocations in
arm_valid_symbolic_address and is the surest fix for this
for GCC8 and GCC7.

Regression tested on arm-none-linux-gnueabihf . Applying to
trunk and backporting to GCC-7 in a day or so.

regards
Ramana

2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

	PR target/81863
	* config/arm/arm.c (arm_valid_symbolic_address): Handle arm_word_relocations


2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

	PR target/81863
	* gcc.target/arm/pr81863.c: New test.

From-SVN: r258886

gcc/ChangeLog

+2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
+
+	PR target/81863
+	* config/arm/arm.c (arm_valid_symbolic_address): Handle arm_word_relocations
+
 2018-03-27  Cesar Philippidis  <cesar@codesourcery.com>
 
 	PR target/85056
@@ -6,7 +11,7 @@
 
 2018-03-27  Richard Biener  <rguenther@suse.de>
 
-	PR middle-ed/84067
+	PR middle-end/84067
 	* match.pd ((A * C) +- (B * C) -> (A+-B) * C): Guard with
 	explicit single_use checks.
 

gcc/config/arm/arm.c

@@ -29787,6 +29787,9 @@ arm_valid_symbolic_address_p (rtx addr)
   rtx xop0, xop1 = NULL_RTX;
   rtx tmp = addr;
 
+  if (target_word_relocations)
+    return false;
+
   if (GET_CODE (tmp) == SYMBOL_REF || GET_CODE (tmp) == LABEL_REF)
     return true;
 

gcc/testsuite/ChangeLog

+2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
+
+	PR target/81863
+	* gcc.target/arm/pr81863.c: New test.
+
 2018-03-27  Cesar Philippidis  <cesar@codesourcery.com>
 
 	PR target/85056

gcc/testsuite/gcc.target/arm/pr81863.c

+/* testsuite/gcc.target/arm/pr48183.c */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mword-relocations -march=armv7-a -marm" } */
+/* { dg-final { scan-assembler-not "\[\\t \]+movw" } } */
+
+int a, d, f;
+long b;
+struct ww_class {
+  int stamp;
+} c;
+struct stress {
+  int locks;
+  int nlocks;
+};
+void *e;
+int atomic_add_return_relaxed(int *p1) {
+  __builtin_prefetch(p1);
+  return a;
+}
+void atomic_long_inc_return_relaxed(int *p1) {
+  int *v = p1;
+  atomic_add_return_relaxed(v);
+}
+void ww_acquire_init(struct ww_class *p1) {
+  atomic_long_inc_return_relaxed(&p1->stamp);
+}
+void ww_mutex_lock();
+int *get_random_order();
+void stress_inorder_work() {
+  struct stress *g = e;
+  int h = g->nlocks;
+  int *i = &g->locks, *j = get_random_order();
+  do {
+    int n;
+    ww_acquire_init(&c);
+  retry:
+    for (n = 0; n < h; n++)
+      ww_mutex_lock(i[j[n]]);
+    f = n;
+    if (d)
+      goto retry;
+  } while (b);
+}
+