re PR tree-optimization/88243 (ice in vect_create_epilog_for_reduction, at tree-vect-loop.c:4689)

2018-11-29  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88243
	* tree-vect-patterns.c (vect_mark_pattern_stmts): Set the def
	type of all pattern-sequence stmts to vect_internal_def.

	* gcc.dg/torture/pr88243.c: New testcase.

From-SVN: r266615

gcc/ChangeLog

+2018-11-29  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/88243
+	* tree-vect-patterns.c (vect_mark_pattern_stmts): Set the def
+	type of all pattern-sequence stmts to vect_internal_def.
+
 2018-11-29  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
 	PR target/88224

gcc/testsuite/ChangeLog

+2018-11-29  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/88243
+	* gcc.dg/torture/pr88243.c: New testcase.
+
 2018-11-29  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/87539

gcc/testsuite/gcc.dg/torture/pr88243.c

+/* { dg-do compile } */
+
+int a, b, c;
+
+void d()
+{
+  int e, f;
+  for (; a; a++)
+    {
+      e = (__UINTPTR_TYPE__)d;
+      b = 0;
+      for (; b < 2; b++)
+	{
+	  f = e = e / 2;
+	  c = c + f;
+	}
+    }
+}

gcc/tree-vect-patterns.c

@@ -4723,7 +4723,15 @@ vect_mark_pattern_stmts (stmt_vec_info orig_stmt_info, gimple *pattern_stmt,
   if (def_seq)
     for (gimple_stmt_iterator si = gsi_start (def_seq);
 	 !gsi_end_p (si); gsi_next (&si))
-      vect_init_pattern_stmt (gsi_stmt (si), orig_stmt_info, pattern_vectype);
+      {
+	stmt_vec_info pattern_stmt_info
+	  = vect_init_pattern_stmt (gsi_stmt (si),
+				    orig_stmt_info, pattern_vectype);
+	/* Stmts in the def sequence are not vectorizable cycle or
+	   induction defs, instead they should all be vect_internal_def
+	   feeding the main pattern stmt which retains this def type.  */
+	STMT_VINFO_DEF_TYPE (pattern_stmt_info) = vect_internal_def;
+      }
 
   if (orig_pattern_stmt)
     {