From: Richard Biener <rguenther@suse.de>
Date: Tue, 13 Sep 2022 06:59:41 +0000 (+0200)
Subject: middle-end/106909 - CTRL altering flag after folding
X-Git-Tag: basepoints/gcc-14~4567
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c867232df70d3de304714906b4198ecb262eb32;p=thirdparty%2Fgcc.git

middle-end/106909 - CTRL altering flag after folding

The following makes sure to clear the CTRL altering flag when
folding emits a __builitin_unreachable in place of a virtual call
which now might become a trap.

	PR middle-end/106909
	* gimple-fold.cc (gimple_fold_call): Clear the ctrl-altering
	flag of a unreachable call.
---

diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc
index a1704784bc99..9055cd8982d6 100644
--- a/gcc/gimple-fold.cc
+++ b/gcc/gimple-fold.cc
@@ -5512,6 +5512,7 @@ gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace)
 		{
 		  location_t loc = gimple_location (stmt);
 		  gimple *new_stmt = gimple_build_builtin_unreachable (loc);
+		  gimple_call_set_ctrl_altering (new_stmt, false);
 		  /* If the call had a SSA name as lhs morph that into
 		     an uninitialized value.  */
 		  if (lhs && TREE_CODE (lhs) == SSA_NAME)