PR66306: Fix match_dups on swapped operands.

2015-06-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

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

2015-06-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

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

From-SVN: r224875

gcc/ChangeLog

 2015-06-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
 
+	PR rtl-optimization/66306
+	* reload.c (find_reloads): Swap the match_dup info for
+	commutative operands.
+
+2015-06-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
 	* config/s390/vx-builtins.md
 	("vec_scatter_element<mode>_<non_vec_int>")
 	("vec_scatter_element<V_HW_64:mode>_SI"): Replace gf mode

gcc/reload.c

@@ -3872,6 +3872,12 @@ find_reloads (rtx_insn *insn, int replace, int ind_levels, int live_known,
       std::swap (*recog_data.operand_loc[commutative],
 		 *recog_data.operand_loc[commutative + 1]);
 
+      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)

gcc/testsuite/ChangeLog

 2015-06-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
 
+	PR rtl-optimization/66306
+	* gcc.target/s390/pr66306.c: New test.
+
+2015-06-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
 	* gcc.target/s390/vector/vec-abi-1.c: Add gnu attribute check.
 	* gcc.target/s390/vector/vec-abi-attr-1.c: New test.
 	* gcc.target/s390/vector/vec-abi-attr-2.c: New test.

gcc/testsuite/gcc.target/s390/pr66306.c

+/* 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 ();
+}