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tree-ssa-structalias.c (set_uids_in_ptset): Add is_deref'd parameter, use it.

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2007-06-09  Daniel Berlin  <dberlin@dberlin.org>

	* tree-ssa-structalias.c (set_uids_in_ptset): Add is_deref'd
	parameter, use it.
	(find_what_p_points_to): Pass new parameter to set_uids_in_ptset.

From-SVN: r125603
This commit is contained in:
Daniel Berlin 2007-06-10 20:21:48 +00:00 committed by Daniel Berlin
parent 1bbf850280
commit 6bdff197e6
2 changed files with 17 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-06-09 Daniel Berlin <dberlin@dberlin.org>
* tree-ssa-structalias.c (set_uids_in_ptset): Add is_deref'd
parameter, use it.
(find_what_p_points_to): Pass new parameter to set_uids_in_ptset.
2007-06-09 Daniel Berlin <dberlin@dberlin.org>
* tree-data-ref.c (dr_may_alias_p): Check that decl_a != decl_b,

17
gcc/tree-ssa-structalias.c
View File

@ -4290,10 +4290,12 @@ shared_bitmap_add (bitmap pt_vars)
/* Set bits in INTO corresponding to the variable uids in solution set
FROM, which came from variable PTR.
For variables that are actually dereferenced, we also use type
based alias analysis to prune the points-to sets. */
based alias analysis to prune the points-to sets.
IS_DEREFED is true if PTR was directly dereferenced, which we use to
help determine whether we are we are allowed to prune using TBAA. */
static void
set_uids_in_ptset (tree ptr, bitmap into, bitmap from)
set_uids_in_ptset (tree ptr, bitmap into, bitmap from, bool is_derefed)
{
unsigned int i;
bitmap_iterator bi;
@ -4329,7 +4331,7 @@ set_uids_in_ptset (tree ptr, bitmap into, bitmap from)
if (sft)
{
var_alias_set = get_alias_set (sft);
if (!vi->directly_dereferenced
if ((!is_derefed && !vi->directly_dereferenced)
|| alias_sets_conflict_p (ptr_alias_set, var_alias_set))
bitmap_set_bit (into, DECL_UID (sft));
}
@ -4343,7 +4345,7 @@ set_uids_in_ptset (tree ptr, bitmap into, bitmap from)
else
{
var_alias_set = get_alias_set (vi->decl);
if (!vi->directly_dereferenced
if ((!is_derefed && !vi->directly_dereferenced)
|| alias_sets_conflict_p (ptr_alias_set, var_alias_set))
bitmap_set_bit (into, DECL_UID (vi->decl));
}
@ -4539,14 +4541,17 @@ find_what_p_points_to (tree p)
stats.points_to_sets_created++;
/* Instead of using pt_anything, we instead merge in the SMT
aliases for the underlying SMT. */
aliases for the underlying SMT. In addition, if they
could have pointed to anything, they could point to
global memory. */
if (was_pt_anything)
{
merge_smts_into (p, finished_solution);
pi->pt_global_mem = 1;
}
set_uids_in_ptset (vi->decl, finished_solution, vi->solution);
set_uids_in_ptset (vi->decl, finished_solution, vi->solution,
vi->directly_dereferenced);
result = shared_bitmap_lookup (finished_solution);
if (!result)