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tree-ssa-alias.h (pt_solution_singleton_p): Declare.

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2011-09-26  Tom de Vries  <tom@codesourcery.com>

	* tree-ssa-alias.h (pt_solution_singleton_p): Declare.
	* tree-ssa-structalias.c (pt_solution_singleton_p): New function.
	* tree-ssa-ccp.c (fold_builtin_alloca_for_var): Set points-to solution
	of new var.

From-SVN: r179193
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Tom de Vries 2011-09-26 12:36:56 +00:00 committed by Tom de Vries
parent 750db0248d
commit 703ffc3005
4 changed files with 34 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-09-26 Tom de Vries <tom@codesourcery.com>
* tree-ssa-alias.h (pt_solution_singleton_p): Declare.
* tree-ssa-structalias.c (pt_solution_singleton_p): New function.
* tree-ssa-ccp.c (fold_builtin_alloca_for_var): Set points-to solution
of new var.
2011-09-26 Georg-Johann Lay <avr@gjlay.de>
PR target/50465

1
gcc/tree-ssa-alias.h
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@ -126,6 +126,7 @@ extern void dump_alias_stats (FILE *);
/* In tree-ssa-structalias.c */
extern unsigned int compute_may_aliases (void);
extern bool pt_solution_empty_p (struct pt_solution *);
extern bool pt_solution_singleton_p (struct pt_solution *, unsigned *);
extern bool pt_solution_includes_global (struct pt_solution *);
extern bool pt_solution_includes (struct pt_solution *, const_tree);
extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *);

11
gcc/tree-ssa-ccp.c
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@ -1729,6 +1729,17 @@ fold_builtin_alloca_for_var (gimple stmt)
array_type = build_array_type_nelts (elem_type, n_elem);
var = create_tmp_var (array_type, NULL);
DECL_ALIGN (var) = align;
{
struct ptr_info_def *pi = SSA_NAME_PTR_INFO (lhs);
if (pi != NULL && !pi->pt.anything)
{
bool singleton_p;
unsigned uid;
singleton_p = pt_solution_singleton_p (&pi->pt, &uid);
gcc_assert (singleton_p);
SET_DECL_PT_UID (var, uid);
}
}
/* Fold alloca to the address of the array. */
return fold_convert (TREE_TYPE (lhs), build_fold_addr_expr (var));

15
gcc/tree-ssa-structalias.c
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@ -5979,6 +5979,21 @@ pt_solution_empty_p (struct pt_solution *pt)
return true;
}
/* Return true if the points-to solution *PT only point to a single var, and
return the var uid in *UID. */
bool
pt_solution_singleton_p (struct pt_solution *pt, unsigned *uid)
{
if (pt->anything || pt->nonlocal || pt->escaped || pt->ipa_escaped
|| pt->null || pt->vars == NULL
|| !bitmap_single_bit_set_p (pt->vars))
return false;
*uid = bitmap_first_set_bit (pt->vars);
return true;
}
/* Return true if the points-to solution *PT includes global memory. */
bool