re PR tree-optimization/66636 (ICE in vect_get_vec_def_for_stmt_copy, at tree-vect-stmts.c:1590)

2015-06-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/66636
	* tree-vect-stmts.c (vectorizable_store): Properly compute the
	def type for further defs for strided stores.

	* gcc.dg/vect/pr66636.c: New testcase.

From-SVN: r224841

gcc/ChangeLog

+2015-06-23  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/66636
+	* tree-vect-stmts.c (vectorizable_store): Properly compute the
+	def type for further defs for strided stores.
+
 2015-06-23  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* config/nvptx/nvptx.md (sel_true<mode>, sel_false<mode>): New

gcc/testsuite/ChangeLog

+2015-06-23  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/66636
+	* gcc.dg/vect/pr66636.c: New testcase.
+
 2015-06-23  Marek Polacek  <polacek@redhat.com>
 
 	* gcc.dg/fold-minus-4.c: New test.

gcc/testsuite/gcc.dg/vect/pr66636.c

+/* { dg-additional-options "-mavx2" { target avx_runtime } } */
+
+#include "tree-vect.h"
+
+extern void abort (void);
+
+struct X { double x; double y; };
+
+void foo (struct X *x, double px, int s)
+{
+  int i;
+  for (i = 0; i < 256; ++i)
+    {
+      x[i*s].x = px;
+      x[i*s].y = i + px;
+    }
+}
+
+int main()
+{
+  struct X x[512];
+  int i;
+  check_vect ();
+  foo (x, 1., 2);
+  if (x[0].x != 1. || x[0].y != 1.
+      || x[510].x != 1. || x[510].y != 256.)
+    abort ();
+  return 0;
+}

gcc/tree-vect-stmts.c

@@ -5365,8 +5365,12 @@ vectorizable_store (gimple stmt, gimple_stmt_iterator *gsi, gimple *vec_stmt,
 		  if (slp)
 		    vec_oprnd = vec_oprnds[j];
 		  else
+		    {
+		      vect_is_simple_use (vec_oprnd, NULL, loop_vinfo,
+					  bb_vinfo, &def_stmt, &def, &dt);
 		      vec_oprnd = vect_get_vec_def_for_stmt_copy (dt, vec_oprnd);
 		    }
+		}
 
 	      for (i = 0; i < nstores; i++)
 		{