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From eba70fb9976ef047a8fb8dc6499c42e8fd3551f7 Mon Sep 17 00:00:00 2001
From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 8 Apr 2011 11:45:29 +0000
Subject: [PATCH 084/200] PR tree-optimization/48377
* tree-vect-data-refs.c (vector_alignment_reachable_p): Set
is_packed to true even for types with smaller TYPE_ALIGN than
TYPE_SIZE.
* gcc.dg/vect/pr48377.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@172174 138bc75d-0d04-0410-961f-82ee72b054a4
index 5295c71..270462e 100644
new file mode 100644
index 0000000..e0cde43
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr48377.c
@@ -0,0 +1,25 @@
+/* PR tree-optimization/48377 */
+/* { dg-do run } */
+
+typedef unsigned int U __attribute__((__aligned__ (1), __may_alias__));
+
+__attribute__((noinline, noclone)) unsigned int
+foo (const char *s, int len)
+{
+ const U *p = (const U *) s;
+ unsigned int f = len / sizeof (unsigned int), hash = len, i;
+
+ for (i = 0; i < f; ++i)
+ hash += *p++;
+ return hash;
+}
+
+char buf[64] __attribute__((aligned (32)));
+
+int
+main (void)
+{
+ return foo (buf + 1, 26) != 26;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index 2c9936c..a1437b5 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/gcc/tree-vect-data-refs.c
@@ -1,5 +1,5 @@
/* Data References Analysis and Manipulation Utilities for Vectorization.
- Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Dorit Naishlos <dorit@il.ibm.com>
and Ira Rosen <irar@il.ibm.com>
@@ -1143,6 +1143,9 @@ vector_alignment_reachable_p (struct data_reference *dr)
if (ba)
is_packed = contains_packed_reference (ba);
+ if (compare_tree_int (TYPE_SIZE (type), TYPE_ALIGN (type)) > 0)
+ is_packed = true;
+
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "Unknown misalignment, is_packed = %d",is_packed);
if (targetm.vectorize.vector_alignment_reachable (type, is_packed))
--
1.7.0.4
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