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| author | Richard Guenther <rguenther@suse.de> | 2008-04-15 13:28:08 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-04-15 13:28:08 +0000 |
| commit | 649caaad399d6f4865a4d0015a1ac76c3cce7eb0 (patch) | |
| tree | 9098d5ac54a9f0a83f6c1809c9d7cb33b7f481de /gcc/tree-ssa-sccvn.c | |
| parent | 462c31ef75b495fd95f18a91864c471d2cb76494 (diff) | |
| download | gcc-649caaad399d6f4865a4d0015a1ac76c3cce7eb0.zip gcc-649caaad399d6f4865a4d0015a1ac76c3cce7eb0.tar.gz gcc-649caaad399d6f4865a4d0015a1ac76c3cce7eb0.tar.bz2 | |
tree-ssa-sccvn.h (vn_reference_lookup): Adjust prototype.
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
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index b613b2b..849eade 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -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) { |