re PR tree-optimization/34330 (-ftree-parallelize-loops=4 ICE with the vectorizer also)

2008-05-15  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/34330
	* tree-ssa-alias.c (get_smt_for): Only assert that accesses
	through the pointer will alias the SMT.

	* gcc.dg/torture/pr34330.c: New testcase.

From-SVN: r135329

gcc/ChangeLog

+2008-05-15  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/34330
+	* tree-ssa-alias.c (get_smt_for): Only assert that accesses
+	through the pointer will alias the SMT.
+
 2008-05-14  Andreas Tobler  <a.tobler@schweiz.org>
 
 	* config/sparc/sparc.h (NO_PROFILE_COUNTERS): Define as 0.

gcc/testsuite/ChangeLog

+2008-05-15  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/34330
+	* gcc.dg/torture/pr34330.c: New testcase.
+
 2008-05-14  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR fortran/36059

gcc/testsuite/gcc.dg/torture/pr34330.c

+/* { dg-do compile } */
+/* { dg-options "-ftree-parallelize-loops=4 -ftree-vectorize" } */
+
+struct T
+{
+  int t;
+  struct { short s1, s2, s3, s4; } *s;
+};
+
+void
+foo (int *a, int *b, int *c, int *d, struct T *e)
+{
+  int i;
+  for (i = 0; i < e->t; i++)
+    {
+      e->s[i].s1 = a[i];
+      e->s[i].s2 = b[i];
+      e->s[i].s3 = c[i];
+      e->s[i].s4 = d[i];
+    }
+}

gcc/tree-ssa-alias.c

@@ -3025,8 +3025,11 @@ get_smt_for (tree ptr, struct alias_info *ai)
   TREE_THIS_VOLATILE (tag) |= TREE_THIS_VOLATILE (tag_type);
 
   /* Make sure that the symbol tag has the same alias set as the
-     pointed-to type.  */
-  gcc_assert (tag_set == get_alias_set (tag));
+     pointed-to type or at least accesses through the pointer will
+     alias that set.  The latter can happen after the vectorizer
+     created pointers of vector type.  */
+  gcc_assert (tag_set == get_alias_set (tag)
+	      || alias_set_subset_of (tag_set, get_alias_set (tag)));
 
   return tag;
 }