From: Jan Hubicka <hubicka@ucw.cz>
Date: Mon, 23 Aug 2021 14:16:25 +0000 (+0200)
Subject: Fix previous ipa-modref patch
X-Git-Tag: releases/gcc-11.3.0~994
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e527b92b183de8c887213ccf6b024ddb4e363865;p=thirdparty%2Fgcc.git

Fix previous ipa-modref patch

gcc/ChangeLog:

	PR middle-end/101949
	* ipa-modref.c (analyze_ssa_name_flags): Fix merging of
	EAF_NOCLOBBER

(cherry picked from commit 5bd4ab91660c8f5534c46979d4846a4f1a0972b0)
---

diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c
index dc5ee8cc2d0e..80f192d9025c 100644
--- a/gcc/ipa-modref.c
+++ b/gcc/ipa-modref.c
@@ -1628,7 +1628,7 @@ analyze_ssa_name_flags (tree name, vec<modref_lattice> &lattice, int depth,
 	     is on since that would allow propagation of this from -fno-ipa-pta
 	     to -fipa-pta functions.  */
 	  if (gimple_call_fn (use_stmt) == name)
-	    lattice[index].merge (~EAF_NOCLOBBER);
+	    lattice[index].merge (~(EAF_NOCLOBBER | EAF_UNUSED));
 
 	  /* Return slot optimization would require bit of propagation;
 	     give up for now.  */