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* [gcc r14-4738] rtl-ssa: Add entry point to allow re-parenting uses
@ 2023-10-19 10:14 Alex Coplan
0 siblings, 0 replies; only message in thread
From: Alex Coplan @ 2023-10-19 10:14 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:ba230aa1b855c32d5414183b604e45ce836fb532
commit r14-4738-gba230aa1b855c32d5414183b604e45ce836fb532
Author: Alex Coplan <alex.coplan@arm.com>
Date: Thu Aug 17 16:16:46 2023 +0100
rtl-ssa: Add entry point to allow re-parenting uses
This is needed by the upcoming aarch64 load pair pass, as it can
re-order stores (when alias analysis determines this is safe) and thus
change which mem def a given use consumes (in the RTL-SSA view, there is
no alias disambiguation of memory).
gcc/ChangeLog:
* rtl-ssa/accesses.cc (function_info::reparent_use): New.
* rtl-ssa/functions.h (function_info): Declare new member
function reparent_use.
Diff:
---
gcc/rtl-ssa/accesses.cc | 8 ++++++++
gcc/rtl-ssa/functions.h | 3 +++
2 files changed, 11 insertions(+)
diff --git a/gcc/rtl-ssa/accesses.cc b/gcc/rtl-ssa/accesses.cc
index f12b5f4dd775..774ab9d99eea 100644
--- a/gcc/rtl-ssa/accesses.cc
+++ b/gcc/rtl-ssa/accesses.cc
@@ -1239,6 +1239,14 @@ function_info::add_use (use_info *use)
insert_use_before (use, neighbor->value ());
}
+void
+function_info::reparent_use (use_info *use, set_info *new_def)
+{
+ remove_use (use);
+ use->set_def (new_def);
+ add_use (use);
+}
+
// If USE has a known definition, remove USE from that definition's list
// of uses. Also remove if it from the associated splay tree, if any.
void
diff --git a/gcc/rtl-ssa/functions.h b/gcc/rtl-ssa/functions.h
index 8b53b2640642..d7da9774213c 100644
--- a/gcc/rtl-ssa/functions.h
+++ b/gcc/rtl-ssa/functions.h
@@ -159,6 +159,9 @@ public:
// Like change_insns, but for a single change CHANGE.
void change_insn (insn_change &change);
+ // Given a use USE, re-parent it to get its def from NEW_DEF.
+ void reparent_use (use_info *use, set_info *new_def);
+
// If the changes that have been made to instructions require updates
// to the CFG, perform those updates now. Return true if something changed.
// If it did:
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