From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 13 Jan 2016 08:26:45 +0000 (+0000)
Subject: 2016-01-13  Richard Biener  <rguenther@suse.de>
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1ca1d9b210ba8ea9c3d8009dd0094069b5b3aff3;p=thirdparty%2Fgcc.git

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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@232314 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f8f818bfb5d0..cb2ec45280a2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+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
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 240fae713e41..0ce47d49ea73 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+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
diff --git a/gcc/testsuite/gcc.dg/torture/pr69186.c b/gcc/testsuite/gcc.dg/torture/pr69186.c
new file mode 100644
index 000000000000..d897ff6410b7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr69186.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+
+static int a[10][2];
+int b;
+
+void
+fn1 ()
+{
+  b = 0;
+  for (; b < 6; b++)
+    a[b][2] ^= 1;
+}
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index d0e20da04a62..3605fa4a7a4c 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/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)