[gcc r13-2640] middle-end/106909 - CTRL altering flag after folding

[gcc r13-2640] middle-end/106909 - CTRL altering flag after folding

[Richard Biener]

https://gcc.gnu.org/g:2c867232df70d3de304714906b4198ecb262eb32

commit r13-2640-g2c867232df70d3de304714906b4198ecb262eb32
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Sep 13 08:59:41 2022 +0200

    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:
---
 gcc/gimple-fold.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc
index a1704784bc9..9055cd8982d 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)