break;
}
- /* remove Casts */
- if (is_Cast(left))
- left = get_Cast_op(left);
- if (is_Cast(right))
- right = get_Cast_op(right);
+ /* remove Casts of both sides */
+ left = skip_Cast(left);
+ right = skip_Cast(right);
/* Remove unnecessary conversions */
/* TODO handle constants */
}
}
- /* remove operation of both sides if possible */
+ /* remove operation on both sides if possible */
if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
/*
* The following operations are NOT safe for floating point operations, for instance
op = get_irn_op(n);
}
}
- if (op == op_SymConst && get_SymConst_kind(n) == symconst_addr_ent)
+ if (is_Global(n)) {
+ /* global references are never NULL */
return 1;
- if (op == op_Const) {
- if (!is_Const_null(n))
- return 1;
+ } else if (n == get_irg_frame(current_ir_graph)) {
+ /* local references are never NULL */
+ return 1;
+ } else if (op == op_Const) {
+ /* explicit non-NULL addresses */
+ return !is_Const_null(n);
} else {
+ /* check for more Confirms */
for (; is_Confirm(n); n = skip_Cast(get_Confirm_value(n))) {
if (get_Confirm_cmp(n) != pn_Cmp_Lg) {
ir_node *bound = get_Confirm_bound(n);
pnc = get_inversed_pnc(pnc);
} else if (! is_Confirm(left)) {
- /* no Confirm on either one side, finish */
- return tarval_bad;
+ /* nothing more found */
+ tv = tarval_bad;
+ goto check_null_case;
}
/* ok, here at least left is a Confirm, right might be */
get_interval(&l_iv, l_bound, l_pnc),
get_interval_from_tv(&r_iv, tv),
pnc);
+ } else {
+check_null_case:
+ /* check some other cases */
+ if ((pnc == pn_Cmp_Eq || pnc == pn_Cmp_Lg) &&
+ is_Const(right) && is_Const_null(right)) {
+ /* for == 0 or != 0 we have some special tools */
+ ir_mode *mode = get_irn_mode(left);
+ ir_node *dummy;
+ if (mode_is_reference(mode)) {
+ if (value_not_null(left, &dummy)) {
+ tv = pnc == pn_Cmp_Eq ? tarval_b_false : tarval_b_true;
+ }
+ } else {
+ if (value_not_zero(left, &dummy)) {
+ tv = pnc == pn_Cmp_Eq ? tarval_b_false : tarval_b_true;
+ }
+ }
+ }
}
if (tv != tarval_bad)