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.
From-SVN: r137197
