re PR tree-optimization/26258 (Wrong alias information for struct addresses in PHIs)

2006-02-14  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/26258
	* tree-ssa-structalias.c (find_func_aliases): Handle aggregates
	in PHI argument processing.

	* gcc.dg/torture/pr26258.c: New testcase.

From-SVN: r110963

1 files changed, 28 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/torture/pr26258.c b/gcc/testsuite/gcc.dg/torture/pr26258.c
new file mode 100644
index 0000000..e9acd55
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr26258.c
@@ -0,0 +1,28 @@
+/* { dg-do run } */
+
+extern void abort(void);
+
+typedef struct Foo { int a; int b; }  Foo;
+
+Foo foo(Foo first, Foo last, _Bool ret_first)
+{
+  Foo t;
+  Foo *t1 = (ret_first ? &first : &last);
+  first.a = 2;
+  last.b = 3;
+  t.a = t1->a;
+  t.b = t1->b;
+  t.a += first.a;
+  t.b += last.b;
+  return t;
+}
+
+int main()
+{
+  Foo first = (Foo){1, 2};
+  Foo last = (Foo){3, 4};
+  Foo ret = foo(first, last, 0);
+  if (ret.b != 6)
+    abort ();
+  return 0;
+}