public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r14-272] Quicker relation check.
@ 2023-04-26 19:25 Andrew Macleod
0 siblings, 0 replies; only message in thread
From: Andrew Macleod @ 2023-04-26 19:25 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:bf50499a14943b64f19bd72c60422683f7ecd0ee
commit r14-272-gbf50499a14943b64f19bd72c60422683f7ecd0ee
Author: Andrew MacLeod <amacleod@redhat.com>
Date: Wed Feb 8 12:36:23 2023 -0500
Quicker relation check.
If either of the SSA names in a comparison do not have any equivalences
or relations, we can short-circuit the check slightly.
* value-relation.cc (dom_oracle::query_relation): Check early for lack
of any relation.
* value-relation.h (equiv_oracle::has_equiv_p): New.
Diff:
---
gcc/value-relation.cc | 6 ++++++
gcc/value-relation.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/gcc/value-relation.cc b/gcc/value-relation.cc
index 30a02d3c9d3..65cf7694d40 100644
--- a/gcc/value-relation.cc
+++ b/gcc/value-relation.cc
@@ -1374,6 +1374,12 @@ dom_oracle::query_relation (basic_block bb, tree ssa1, tree ssa2)
if (v1 == v2)
return VREL_EQ;
+ // If v1 or v2 do not have any relations or equivalences, a partial
+ // equivalence is the only possibility.
+ if ((!bitmap_bit_p (m_relation_set, v1) && !has_equiv_p (v1))
+ || (!bitmap_bit_p (m_relation_set, v2) && !has_equiv_p (v2)))
+ return partial_equiv (ssa1, ssa2);
+
// Check for equivalence first. They must be in each equivalency set.
const_bitmap equiv1 = equiv_set (ssa1, bb);
const_bitmap equiv2 = equiv_set (ssa2, bb);
diff --git a/gcc/value-relation.h b/gcc/value-relation.h
index 3177ecb1ad0..be6e277421b 100644
--- a/gcc/value-relation.h
+++ b/gcc/value-relation.h
@@ -170,6 +170,7 @@ public:
void dump (FILE *f) const override;
protected:
+ inline bool has_equiv_p (unsigned v) { return bitmap_bit_p (m_equiv_set, v); }
bitmap_obstack m_bitmaps;
struct obstack m_chain_obstack;
private:
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-04-26 19:25 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-04-26 19:25 [gcc r14-272] Quicker relation check Andrew Macleod
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).