From ab5fb0f99313a7d1204a82c5aeb6748d98c7fb0f Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Thu, 15 Feb 2024 10:52:09 +0100
Subject: [PATCH] Do not record dependences from debug stmts in tail merging

The following avoids recording BB dependences for debug stmt uses.

	* tree-ssa-tail-merge.cc (same_succ_hash): Skip debug
	stmts.
---
 gcc/tree-ssa-tail-merge.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/tree-ssa-tail-merge.cc b/gcc/tree-ssa-tail-merge.cc
index f4e6ae6e8a2..c8b4a79294d 100644
--- a/gcc/tree-ssa-tail-merge.cc
+++ b/gcc/tree-ssa-tail-merge.cc
@@ -474,6 +474,9 @@ same_succ_hash (const same_succ *e)
        !gsi_end_p (gsi); gsi_next_nondebug (&gsi))
     {
       stmt = gsi_stmt (gsi);
+      if (is_gimple_debug (stmt))
+	continue;
+
       stmt_update_dep_bb (stmt);
       if (stmt_local_def (stmt))
 	continue;