re PR tree-optimization/64493 (ICE at -O3 on x86_64-linux-gnu)

2015-01-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/64493
	PR tree-optimization/64495
	* tree-vect-loop.c (vect_finalize_reduction): For double-reductions
	assign the proper vectorized PHI to the inner loop exit PHIs.

	* gcc.dg/vect/pr64493.c: New testcase.
	* gcc.dg/vect/pr64495.c: Likewise.

From-SVN: r219579

gcc/ChangeLog

+2015-01-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/64493
+	PR tree-optimization/64495
+	* tree-vect-loop.c (vect_finalize_reduction): For double-reductions
+	assign the proper vectorized PHI to the inner loop exit PHIs.
+
 2015-01-14  Joey Ye  <joey.ye@arm.com>
 
 	* config/arm/arm.c (arm_compute_save_reg_mask):

gcc/testsuite/ChangeLog

+2015-01-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/64493
+	PR tree-optimization/64495
+	* gcc.dg/vect/pr64493.c: New testcase.
+	* gcc.dg/vect/pr64495.c: Likewise.
+
 2015-01-13  Martin Uecker <uecker@eecs.berkeley.edu>
 
 	* gcc.dg/Warray-bounds-11.c: New test-case.

gcc/testsuite/gcc.dg/vect/pr64493.c

+/* { dg-do run } */
+
+#include "tree-vect.h"
+
+int a, b, c, d, e, f, g, h;
+
+int
+main ()
+{
+  check_vect ();
+
+  for (; a; a--)
+    for (d = 1; d <= 0; d++)
+      for (; d;)
+	if (h)
+	  {
+	    if (!g) __builtin_abort ();
+	    if (!0) __builtin_abort ();
+	  }
+
+  for (f = 4; f; f--)
+    {
+      for (b = 0; b < 2; b++)
+	c |= 1;
+      e |= c;
+    }
+
+  return 0;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */

gcc/testsuite/gcc.dg/vect/pr64495.c

+/* { dg-do run } */
+
+#include <assert.h>
+#include "tree-vect.h"
+
+int a, b, c, d, e, f, g, i, j;
+static int *h = &e;
+
+int
+main ()
+{
+  check_vect ();
+
+  for (; a;)
+    for (; g; g++)
+      for (; f; f++)
+	if (j)
+	  {
+	    assert(b); 
+	    assert(0);
+	  }
+  for (i = 24; i; i--)
+    {
+      for (c = 0; c < 6; c++)
+	d |= 1;
+      *h |= d;
+    }
+
+  if (e != 1) 
+    __builtin_abort (); 
+
+  return 0;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */

gcc/tree-vect-loop.c

@@ -4580,7 +4580,10 @@ vect_finalize_reduction:
                            && !STMT_VINFO_LIVE_P (exit_phi_vinfo))
                           || double_reduc);
 
-              STMT_VINFO_VEC_STMT (exit_phi_vinfo) = epilog_stmt;
+	      if (double_reduc)
+		STMT_VINFO_VEC_STMT (exit_phi_vinfo) = inner_phi;
+	      else
+		STMT_VINFO_VEC_STMT (exit_phi_vinfo) = epilog_stmt;
               if (!double_reduc
                   || STMT_VINFO_DEF_TYPE (exit_phi_vinfo)
                       != vect_double_reduction_def)