From c97b167e35774e5add4d1079b552383d3fea62dc Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Tue, 24 Oct 2023 11:30:52 +0100
Subject: [PATCH] rtl-ssa: Fix handling of deleted insns
RTL-SSA queues up some invasive changes for later. But sometimes
the insns involved in those changes can be deleted by later
optimisations, making the queued change unnecessary. This patch
checks for that case.
gcc/
* rtl-ssa/changes.cc (function_info::perform_pending_updates): Check
whether an insn has been replaced by a note.
---
gcc/rtl-ssa/changes.cc | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/rtl-ssa/changes.cc b/gcc/rtl-ssa/changes.cc
index 73ab3ccfd242..de6222ae736b 100644
--- a/gcc/rtl-ssa/changes.cc
+++ b/gcc/rtl-ssa/changes.cc
@@ -983,7 +983,10 @@ function_info::perform_pending_updates ()
for (insn_info *insn : m_queued_insn_updates)
{
rtx_insn *rtl = insn->rtl ();
- if (JUMP_P (rtl))
+ if (NOTE_P (rtl))
+ // The insn was later optimized away, typically to a NOTE_INSN_DELETED.
+ ;
+ else if (JUMP_P (rtl))
{
if (INSN_CODE (rtl) == NOOP_MOVE_INSN_CODE)
{
--
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