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* [gcc r13-1952] Do not walk equivalence set in path_oracle::killing_def.
@ 2022-08-03 19:37 Andrew Macleod
0 siblings, 0 replies; only message in thread
From: Andrew Macleod @ 2022-08-03 19:37 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:19ffb35d17474bb4dd3eb78963c28d10b5362321
commit r13-1952-g19ffb35d17474bb4dd3eb78963c28d10b5362321
Author: Andrew MacLeod <amacleod@redhat.com>
Date: Wed Aug 3 13:55:42 2022 -0400
Do not walk equivalence set in path_oracle::killing_def.
When killing a def in the path ranger, there is no need to walk the set
of existing equivalences clearing bits. An equivalence match requires
that both ssa-names have to be in each others set. As killing_def
creates a new empty set contianing only the current def, it already
ensures false equivaelnces won't happen.
PR tree-optimization/106514
* value-relation.cc (path_oracle::killing_def) Do not walk the
equivalence set clearing bits.
Diff:
---
gcc/value-relation.cc | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/gcc/value-relation.cc b/gcc/value-relation.cc
index a447021214f..3f0957ccdd6 100644
--- a/gcc/value-relation.cc
+++ b/gcc/value-relation.cc
@@ -1400,16 +1400,7 @@ path_oracle::killing_def (tree ssa)
unsigned v = SSA_NAME_VERSION (ssa);
bitmap_set_bit (m_killed_defs, v);
-
- // Walk the equivalency list and remove SSA from any equivalencies.
- if (bitmap_bit_p (m_equiv.m_names, v))
- {
- for (equiv_chain *ptr = m_equiv.m_next; ptr; ptr = ptr->m_next)
- if (bitmap_bit_p (ptr->m_names, v))
- bitmap_clear_bit (ptr->m_names, v);
- }
- else
- bitmap_set_bit (m_equiv.m_names, v);
+ bitmap_set_bit (m_equiv.m_names, v);
// Now add an equivalency with itself so we don't look to the root oracle.
bitmap b = BITMAP_ALLOC (&m_bitmaps);
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