https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63995
--- Comment #7 from Ilya Enkovich <enkovich.gnu at gmail dot com> ---
In chkpopt pass calls to bndmk are moved down to uses to decrease register
pressure. Debug info introduces new uses and therefore it affects a position
where bndmk calls appear.
-g0 case:
<bb 4>:
r.field = -1;
__bound_tmp.1_13 = __builtin_ia32_bndmk (&r, 4);
test2.chkp (&r, __bound_tmp.1_13);
-g case:
<bb 4>:
# DEBUG c => &r
__bound_tmp.1_13 = __builtin_ia32_bndmk (&r, 4);
# DEBUG __chkp_bounds_of_c => NULL
r.field = -1;
test2.chkp (&r, __bound_tmp.1_13);
Will ignore debug statements when computing a new position for bounds
load/creation (BTW debug statement seems to be damaged by gsi_move_before
called for bndmk). Testing following fix:
diff --git a/gcc/tree-chkp-opt.c b/gcc/tree-chkp-opt.c
index ff390d7..b8d5d0b 100644
--- a/gcc/tree-chkp-opt.c
+++ b/gcc/tree-chkp-opt.c
@@ -1175,7 +1175,9 @@ chkp_reduce_bounds_lifetime (void)
FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, op)
{
- if (dom_bb &&
+ if (is_gimple_debug (use_stmt))
+ continue;
+ else if (dom_bb &&
dominated_by_p (CDI_DOMINATORS,
dom_bb, gimple_bb (use_stmt)))
{
