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whether an insn has been replaced by a note.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 73ab3ccfd24..de6222ae736 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)
{
--
2.25.1
