File gcc48-pr66306.patch of Package cross-x86_64-gcc48-icecream-backend.2537

this fixes a reload problem with match_dup's on commutative operands.

Bootstrapped and regtested on x86-64, ppc64, and s390x.

Ok?

Bye,

-Andreas-

2015-06-11  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR rtl-optimization/66306
	* reload.c (find_reloads): Swap the match_dup info for
	commutative operands.

2015-06-11  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR rtl-optimization/66306
	* gcc.target/s390/pr66306.c: New test.

diff --git a/gcc/reload.c b/gcc/reload.c
index 2546c1b..48ad99c 100644
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -3924,6 +3924,12 @@ find_reloads (rtx insn, int replace, int ind_levels, int live_known,
 	= *recog_data.operand_loc[commutative + 1];
       *recog_data.operand_loc[commutative + 1] = tem;
 
+      for (i = 0; i < recog_data.n_dups; i++)
+	if (recog_data.dup_num[i] == commutative
+	    || recog_data.dup_num[i] == commutative + 1)
+	  *recog_data.dup_loc[i]
+	    = recog_data.operand[(int) recog_data.dup_num[i]];
+
       for (i = 0; i < n_reloads; i++)
 	{
 	  if (rld[i].opnum == commutative)
diff --git a/gcc/testsuite/gcc.target/s390/pr66306.c b/gcc/testsuite/gcc.target/s390/pr66306.c
new file mode 100644
index 0000000..73903cb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/s390/pr66306.c
@@ -0,0 +1,26 @@
+/* This caused an ICE on s390x due to a reload bug handling
+   commutative constraints.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+struct line_map
+{
+  unsigned start_location;
+  unsigned ordinary;
+};
+unsigned
+linemap_resolve_location (struct line_map **loc_map);
+
+unsigned
+linemap_position_for_loc_and_offset (unsigned h, unsigned loc)
+{
+  struct line_map *map = 0;
+  linemap_resolve_location (&map);
+
+  if (map->ordinary <= loc + map->start_location + map->ordinary)
+    __builtin_abort ();
+
+  if (h >= loc + map->start_location)
+    __builtin_abort ();
+}