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tree-ssa-sccvn.h (vn_reference_lookup): Adjust prototype.

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2008-04-15  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-sccvn.h (vn_reference_lookup): Adjust prototype.
	* tree-ssa-sccvn.c (vn_reference_lookup): New parameter maywalk.
	(visit_reference_op_load): Do walk vuse-vdef chains on
	vn_reference_lookup.
	(visit_reference_op_store): But do not here.
	* tree-vn.c (vn_lookup): Do not walk vuse-vdef chains on
	vn_reference_lookup.
	(vn_lookup_with_vuses): But do so here.

From-SVN: r134314
This commit is contained in:
Richard Guenther 2008-04-15 13:28:08 +00:00 • committed by Richard Biener
parent 462c31ef75
commit 649caaad39
4 changed files with 19 additions and 7 deletions
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11
gcc/ChangeLog
View file

@ -1,3 +1,14 @@
2008-04-15 Richard Guenther <rguenther@suse.de>
* tree-ssa-sccvn.h (vn_reference_lookup): Adjust prototype.
* tree-ssa-sccvn.c (vn_reference_lookup): New parameter maywalk.
(visit_reference_op_load): Do walk vuse-vdef chains on
vn_reference_lookup.
(visit_reference_op_store): But do not here.
* tree-vn.c (vn_lookup): Do not walk vuse-vdef chains on
vn_reference_lookup.
(vn_lookup_with_vuses): But do so here.
2008-04-14 Ian Lance Taylor <iant@google.com>
* fold-const.c (fold_overflow_warning): Remove assertion.

7
gcc/tree-ssa-sccvn.c
View file

@ -735,7 +735,7 @@ vn_reference_lookup_1 (vn_reference_t vr)
it does not exist in the hash table. */
tree
vn_reference_lookup (tree op, VEC (tree, gc) *vuses)
vn_reference_lookup (tree op, VEC (tree, gc) *vuses, bool maywalk)
{
struct vn_reference_s vr1;
tree result, def_stmt;
@ -748,6 +748,7 @@ vn_reference_lookup (tree op, VEC (tree, gc) *vuses)
/* If there is a single defining statement for all virtual uses, we can
use that, following virtual use-def chains. */
if (!result
&& maywalk
&& vr1.vuses
&& VEC_length (tree, vr1.vuses) >= 1
&& !get_call_expr_in (op)
@ -1188,7 +1189,7 @@ static bool
visit_reference_op_load (tree lhs, tree op, tree stmt)
{
bool changed = false;
tree result = vn_reference_lookup (op, shared_vuses_from_stmt (stmt));
tree result = vn_reference_lookup (op, shared_vuses_from_stmt (stmt), true);
/* We handle type-punning through unions by value-numbering based
on offset and size of the access. Be prepared to handle a
@ -1294,7 +1295,7 @@ visit_reference_op_store (tree lhs, tree op, tree stmt)
Otherwise, the vdefs for the store are used when inserting into
the table, since the store generates a new memory state. */
result = vn_reference_lookup (lhs, shared_vuses_from_stmt (stmt));
result = vn_reference_lookup (lhs, shared_vuses_from_stmt (stmt), false);
if (result)
{

2
gcc/tree-ssa-sccvn.h
View file

@ -59,7 +59,7 @@ void free_scc_vn (void);
void switch_to_PRE_table (void);
tree vn_nary_op_lookup (tree);
void vn_nary_op_insert (tree, tree);
tree vn_reference_lookup (tree, VEC (tree, gc) *);
tree vn_reference_lookup (tree, VEC (tree, gc) *, bool);
void vn_reference_insert (tree, tree, VEC (tree, gc) *);
VEC (tree, gc) *shared_vuses_from_stmt (tree);
VEC (tree, gc) *copy_vuses_from_stmt (tree);

6
gcc/tree-vn.c
View file

@ -255,7 +255,7 @@ vn_lookup (tree expr)
/* In the case of array-refs of constants, for example, we can
end up with no vuses. */
case tcc_reference:
return vn_reference_lookup (expr, NULL);
return vn_reference_lookup (expr, NULL, false);
break;
/* It is possible to have CALL_EXPR with no vuses for things
like "cos", and these will fall into vn_lookup. */
@ -264,7 +264,7 @@ vn_lookup (tree expr)
case tcc_expression:
case tcc_declaration:
if (TREE_CODE (expr) == CALL_EXPR || DECL_P (expr))
return vn_reference_lookup (expr, NULL);
return vn_reference_lookup (expr, NULL, false);
else if (TREE_CODE (expr) == SSA_NAME)
return SSA_NAME_VALUE (expr);
else if (TREE_CODE (expr) == ADDR_EXPR)
@ -308,7 +308,7 @@ vn_lookup_with_vuses (tree expr, VEC (tree, gc) *vuses)
if (is_gimple_min_invariant (expr) || TREE_CODE (expr) == FIELD_DECL)
return expr;
return vn_reference_lookup (expr, vuses);
return vn_reference_lookup (expr, vuses, true);
}
static tree