2008-06-27 Richard Guenther <rguenther@suse.de>

	PR tree-optimization/36400
	PR tree-optimization/36373
	PR tree-optimization/36344
	* tree-ssa-structalias.c (var_escaped, escaped_tree, escaped_id,
	var_nonlocal, nonlocal_tree, nonlocal_id): New globals
	(update_alias_info): Remove call clobbering code.
	(make_constraint_to): New helper function.
	(make_escape_constraint): Likewise.
	(handle_rhs_call): Use it on all pointer containing arguments.
	Also mark the static chain escaped.
	(handle_lhs_call): Make constraints from NONLOCAL and ESCAPED
	instead of ANYTHING.
	(make_constraint_from): New helper split out from ...
	(make_constraint_from_anything): ... here.
	(find_func_aliases): Add constraints for escape sites.
	(intra_create_variable_infos): Make constraints from NONLOCAL
	for parameters.
	(find_what_p_points_to): Interpret NONLOCAL and ESCAPED the same
	as ANYTHING.
	(clobber_what_p_points_to): Remove.
	(clobber_what_escaped): New function.
	(init_base_vars): Init NONLOCAL and ESCAPED.
	(do_sd_constraint): Do not propagate the solution from ESCAPED
	but use ESCAPED as a placeholder.
	(solve_graph): Likewise.
	* tree-flow.h (clobber_what_p_points_to): Remove.
	(clobber_what_escaped): Declare.
	* tree-ssa-alias.c (set_initial_properties): Call it.
	Remove code clobbering escaped pointers.

	* gcc.dg/torture/pr36373-1.c: New testcase.
	* gcc.dg/torture/pr36373-2.c: Likewise.
	* gcc.dg/torture/pr36373-3.c: Likewise.
	* gcc.dg/torture/pr36373-4.c: Likewise.
	* gcc.dg/torture/pr36373-5.c: Likewise.
	* gcc.dg/torture/pr36373-6.c: Likewise.
	* gcc.dg/torture/pr36373-7.c: Likewise.
	* gcc.dg/torture/pr36373-8.c: Likewise.
	* gcc.dg/torture/pr36373-9.c: Likewise.
	* gcc.dg/torture/pr36373-10.c: Likewise.
	* gcc.dg/torture/pr36400.c: Likewise.
	* gcc.c-torture/execute/pta-field-1.c: Likewise.
	* gcc.c-torture/execute/pta-field-2.c: Likewise.
	* gcc.dg/tree-ssa/loadpre8.c: Remove XFAIL.
	* gcc.dg/tree-ssa/pr24287.c: XFAIL.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@137204 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 36 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/torture/pr36373-3.c b/gcc/testsuite/gcc.dg/torture/pr36373-3.c
new file mode 100644
index 00000000000..d5ad93e1b9b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr36373-3.c
@@ -0,0 +1,36 @@
+/* { dg-do run } */
+
+extern void abort (void);
+struct Foo {
+    int *p;
+};
+struct Bar {
+    struct Foo *x;
+    int *q;
+};
+struct Foo __attribute__((noinline))
+bar(int *p)
+{
+  struct Foo f;
+  f.p = p;
+  return f;
+}
+void __attribute__((noinline))
+foo(struct Foo f)
+{
+  *f.p = 0;
+}
+int main()
+{
+  int a, b;
+  a = 0;
+  b = 1;
+  struct Bar f;
+  struct Foo g = bar (&b);
+  f.x = &g;
+  f.q = &a;
+  foo(*f.x);
+  if (b != 0)
+    abort ();
+  return 0;
+}