diff options
| author | Richard Guenther <rguenther@suse.de> | 2009-06-29 12:23:21 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-06-29 12:23:21 +0000 |
| commit | 74d27244ecfc02a14355efc26855034a684daeb9 (patch) | |
| tree | 9628cef93c202d8f6bd22c558673343fbd31f01a /gcc/tree-ssa-alias.c | |
| parent | 5b21f0f37dd072967e60c5e413dbabec1eb1c837 (diff) | |
| download | gcc-74d27244ecfc02a14355efc26855034a684daeb9.zip gcc-74d27244ecfc02a14355efc26855034a684daeb9.tar.gz gcc-74d27244ecfc02a14355efc26855034a684daeb9.tar.bz2 | |
re PR middle-end/14187 ([tree-ssa] C restricted pointers are not properly implemented)
2009-06-29 Richard Guenther <rguenther@suse.de>
PR middle-end/14187
* tree-ssa-alias.h (struct pt_solution): Add vars_contains_restrict
flag.
(pt_solutions_same_restrict_base): Declare.
* tree-ssa-structalias.c (struct variable_info): Add is_restrict_var
flag.
(new_var_info): Initialize is_global_var properly for SSA_NAMEs.
(make_constraint_from, make_copy_constraint): Move earlier.
(make_constraint_from_heapvar): New function.
(make_constraint_from_restrict): Likewise.
(handle_lhs_call): Use it.
(find_func_aliases): Use it to track conversions to restrict
qualified pointers.
(struct fieldoff): Add only_restrict_pointers flag.
(push_fields_onto_fieldstack): Initialize it.
(create_variable_info_for): Track global restrict qualified pointers.
(intra_create_variable_infos): Use make_constraint_from_heapvar.
Track restrict qualified pointer arguments.
(set_uids_in_ptset): Use varinfo is_global_var flag.
(find_what_var_points_to): Set the vars_contains_restrict flag.
Always create the points-to solution for sets including restrict tags.
(pt_solutions_same_restrict_base): New function.
* tree-ssa-alias.c (ptr_derefs_may_alias_p): For two restrict
qualified pointers use pt_solutions_same_restrict_base as
additional source for disambiguation.
* gcc.dg/tree-ssa/restrict-1.c: New testcase.
* gcc.dg/tree-ssa/restrict-2.c: Likewise.
* gcc.dg/tree-ssa/restrict-3.c: Likewise.
* gcc.c-torture/execute/20090623-1.c: Likewise.
* gcc.dg/tree-ssa/ldist-13.c: Likewise.
* gcc.dg/tree-ssa/ldist-14.c: Likewise.
From-SVN: r149048
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index 1473367..e8bca84 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -273,6 +273,13 @@ ptr_derefs_may_alias_p (tree ptr1, tree ptr2) if (!pi1 || !pi2) return true; + /* If both pointers are restrict-qualified try to disambiguate + with restrict information. */ + if (TYPE_RESTRICT (TREE_TYPE (ptr1)) + && TYPE_RESTRICT (TREE_TYPE (ptr2)) + && !pt_solutions_same_restrict_base (&pi1->pt, &pi2->pt)) + return false; + /* ??? This does not use TBAA to prune decls from the intersection that not both pointers may access. */ return pt_solutions_intersect (&pi1->pt, &pi2->pt); |