From 7ab54a765239bdd2ce548cffdd5b83f9c20f69da Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Sat, 11 Nov 2023 17:28:55 +0000
Subject: [PATCH 034/157] [Backport][SME] mode-switching: Add note problem

Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=3cd3a09b3f91a1d023cb180763d40598d6bb274b

optimize_mode_switching uses REG_DEAD notes to track register
liveness, but it failed to tell DF to calculate up-to-date notes.

Noticed by inspection.  I don't have a testcase that fails
because of this.

gcc/
	* mode-switching.cc (optimize_mode_switching): Call
	df_note_add_problem.
---
 gcc/mode-switching.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/mode-switching.cc b/gcc/mode-switching.cc
index 4cf8f03a0..2a9f98793 100644
--- a/gcc/mode-switching.cc
+++ b/gcc/mode-switching.cc
@@ -540,6 +540,7 @@ optimize_mode_switching (void)
       pre_exit = create_pre_exit (n_entities, entity_map, num_modes);
     }
 
+  df_note_add_problem ();
   df_analyze ();
 
   /* Create the bitmap vectors.  */
-- 
2.33.0