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* [gcc r12-3789] path solver: Use range_on_path_entry instead of looking at equivalences.
@ 2021-09-22 11:32 Aldy Hernandez
0 siblings, 0 replies; only message in thread
From: Aldy Hernandez @ 2021-09-22 11:32 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:7e5e44bd1729b7a9b458d512ddf61bfba5031869
commit r12-3789-g7e5e44bd1729b7a9b458d512ddf61bfba5031869
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Wed Sep 22 09:34:15 2021 +0200
path solver: Use range_on_path_entry instead of looking at equivalences.
Cycling through equivalences to improve a range is nowhere near as
efficient as asking the ranger what the range on entry is.
Testing on a hybrid VRP threader, shows that this improves our VRP
threading benefit from 14.5% to 18.5% and our overall jump threads from
0.85% to 1.28%.
Tested on x86-64 Linux.
gcc/ChangeLog:
* gimple-range-path.cc (path_range_query::internal_range_of_expr):
Remove call to improve_range_with_equivs.
(path_range_query::improve_range_with_equivs): Remove
* gimple-range-path.h: Remove improve_range_with_equivs.
Diff:
---
gcc/gimple-range-path.cc | 33 +--------------------------------
gcc/gimple-range-path.h | 1 -
2 files changed, 1 insertion(+), 33 deletions(-)
diff --git a/gcc/gimple-range-path.cc b/gcc/gimple-range-path.cc
index e65c7996bb7..d052ebd81fc 100644
--- a/gcc/gimple-range-path.cc
+++ b/gcc/gimple-range-path.cc
@@ -163,10 +163,6 @@ path_range_query::internal_range_of_expr (irange &r, tree name, gimple *stmt)
if (m_resolve && defined_outside_path (name))
{
range_on_path_entry (r, name);
-
- if (r.varying_p ())
- improve_range_with_equivs (r, name);
-
set_cache (r, name);
return true;
}
@@ -178,7 +174,7 @@ path_range_query::internal_range_of_expr (irange &r, tree name, gimple *stmt)
r.intersect (gimple_range_global (name));
if (m_resolve && r.varying_p ())
- improve_range_with_equivs (r, name);
+ range_on_path_entry (r, name);
set_cache (r, name);
return true;
@@ -201,33 +197,6 @@ path_range_query::range_of_expr (irange &r, tree name, gimple *stmt)
return false;
}
-// Improve the range of NAME with the range of any of its equivalences.
-
-void
-path_range_query::improve_range_with_equivs (irange &r, tree name)
-{
- if (TREE_CODE (name) != SSA_NAME)
- return;
-
- basic_block entry = entry_bb ();
- relation_oracle *oracle = m_ranger.oracle ();
-
- if (const bitmap_head *equivs = oracle->equiv_set (name, entry))
- {
- int_range_max t;
- bitmap_iterator bi;
- unsigned i;
-
- EXECUTE_IF_SET_IN_BITMAP (equivs, 0, i, bi)
- if (i != SSA_NAME_VERSION (name) && r.varying_p ())
- {
- tree equiv = ssa_name (i);
- range_on_path_entry (t, equiv);
- r.intersect (t);
- }
- }
-}
-
bool
path_range_query::unreachable_path_p ()
{
diff --git a/gcc/gimple-range-path.h b/gcc/gimple-range-path.h
index 6f81f21d42f..f7d9832ac8c 100644
--- a/gcc/gimple-range-path.h
+++ b/gcc/gimple-range-path.h
@@ -63,7 +63,6 @@ private:
void ssa_range_in_phi (irange &r, gphi *phi);
void precompute_relations (const vec<basic_block> &);
void precompute_phi_relations (basic_block bb, basic_block prev);
- void improve_range_with_equivs (irange &r, tree name);
void add_copies_to_imports ();
bool add_to_imports (tree name, bitmap imports);
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