From 5dc2a8afda812ea6a2cae0ea01a6481b660465b4 Mon Sep 17 00:00:00 2001
From: "Vladimir N. Makarov" <vmakarov@redhat.com>
Date: Mon, 27 Apr 2026 14:16:43 -0400
Subject: [PATCH] [LRA]: Fix reg notes update

There is a typo in using dead_set instead of set in
clear_sparseset_regnos and regnos_in_sparseset_p.  This can result in
wrong unused (stalled) notes and wrong or worse code generation by
optimizations using unused notes after RA.

gcc/ChangeLog:

	* lra-lives.cc (clear_sparseset_regnos, regnos_in_sparseset_p):
	Use set instead of dead_set.
---
 gcc/lra-lives.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/lra-lives.cc b/gcc/lra-lives.cc
index 1d8f53d5960..15b6b7c8c54 100644
--- a/gcc/lra-lives.cc
+++ b/gcc/lra-lives.cc
@@ -632,7 +632,7 @@ clear_sparseset_regnos (sparseset set, int regno, enum machine_mode mode)
 {
   if (regno >= FIRST_PSEUDO_REGISTER)
     {
-      sparseset_clear_bit (dead_set, regno);
+      sparseset_clear_bit (set, regno);
       return;
     }
   for (int last = end_hard_regno (mode, regno); regno < last; regno++)
@@ -645,7 +645,7 @@ static bool
 regnos_in_sparseset_p (sparseset set, int regno, enum machine_mode mode)
 {
   if (regno >= FIRST_PSEUDO_REGISTER)
-    return sparseset_bit_p (dead_set, regno);
+    return sparseset_bit_p (set, regno);
   for (int last = end_hard_regno (mode, regno); regno < last; regno++)
     if (!sparseset_bit_p (set, regno))
       return false;