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 a1704784bc99a25800a9369a0400ae141ff11952..9055cd8982d6f56160106dfa3b7ac1f7146fb037 100644 (file)
--- 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)