re PR tree-optimization/69186 (ICE at -O3 on x86_64-linux-gnu in…

re PR tree-optimization/69186 (ICE at -O3 on x86_64-linux-gnu in vect_update_misalignment_for_peel, at tree-vect-data-refs.c:889)

2016-01-13  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/69186
	* tree-vect-data-refs.c (vect_enhance_data_refs_alignment):
	Properly guard vect_update_misalignment_for_peel call.

	* gcc.dg/torture/pr69186.c: New testcase.

From-SVN: r232314

gcc/ChangeLog

+2016-01-13  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/69186
+	* tree-vect-data-refs.c (vect_enhance_data_refs_alignment):
+	Properly guard vect_update_misalignment_for_peel call.
+
 2016-01-12  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/pr67755

gcc/testsuite/ChangeLog

+2016-01-13  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/69186
+	* gcc.dg/torture/pr69186.c: New testcase.
+
 2016-01-13  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/67755

gcc/testsuite/gcc.dg/torture/pr69186.c

+/* { dg-do compile } */
+
+static int a[10][2];
+int b;
+
+void
+fn1 ()
+{
+  b = 0;
+  for (; b < 6; b++)
+    a[b][2] ^= 1;
+}

gcc/tree-vect-data-refs.c

@@ -1826,7 +1826,16 @@ vect_enhance_data_refs_alignment (loop_vec_info loop_vinfo)
              misalignment of DR_i must be set to unknown.  */
 	  FOR_EACH_VEC_ELT (datarefs, i, dr)
 	    if (dr != dr0)
-	      vect_update_misalignment_for_peel (dr, dr0, npeel);
+	      {
+		/* Strided accesses perform only component accesses, alignment
+		   is irrelevant for them.  */
+		stmt_info = vinfo_for_stmt (DR_STMT (dr));
+		if (STMT_VINFO_STRIDED_P (stmt_info)
+		    && !STMT_VINFO_GROUPED_ACCESS (stmt_info))
+		  continue;
+
+		vect_update_misalignment_for_peel (dr, dr0, npeel);
+	      }
 
           LOOP_VINFO_UNALIGNED_DR (loop_vinfo) = dr0;
           if (npeel)