From 4fa6845b4b29f33cc7ea3d8ff49b61bb1f460561 Mon Sep 17 00:00:00 2001
From: Eric Botcazou <ebotcazou@adacore.com>
Date: Fri, 13 Jan 2023 22:05:28 +0100
Subject: [PATCH] Fix PR rtl-optimization/108274

Unlike other IPA passes, the ICF pass can be run at -O0 and some testcases
rely on this in the testsuite.  Now it effectively creates a tail call so
the DF information needs be updated in this case after epilogue creation.

gcc/
	PR rtl-optimization/108274
	* function.cc (thread_prologue_and_epilogue_insns): Also update the
	DF information for calls in a few more cases.
---
 gcc/function.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/function.cc b/gcc/function.cc
index 27ba880368ac..cfc4d2f74afe 100644
--- a/gcc/function.cc
+++ b/gcc/function.cc
@@ -6266,7 +6266,10 @@ thread_prologue_and_epilogue_insns (void)
 
   /* Threading the prologue and epilogue changes the artificial refs in the
      entry and exit blocks, and may invalidate DF info for tail calls.  */
-  if (optimize)
+  if (optimize
+      || flag_optimize_sibling_calls
+      || flag_ipa_icf_functions
+      || in_lto_p)
     df_update_entry_exit_and_calls ();
   else
     {