new_lb = wi::max (new_lb, lh_lb, sign);
if (wi::lt_p (rh_ub, 0, sign))
new_lb = wi::max (new_lb, rh_lb, sign);
- // If the limits got swapped around, return varying.
- if (wi::gt_p (new_lb, new_ub,sign))
- r.set_varying (type);
- else
- value_range_with_overflow (r, type, new_lb, new_ub);
+ // If the limits got swapped around, return a conservative range.
+ if (wi::gt_p (new_lb, new_ub, sign))
+ {
+ // Make sure that nonzero|X is nonzero.
+ if (wi::gt_p (lh_lb, 0, sign)
+ || wi::gt_p (rh_lb, 0, sign)
+ || wi::lt_p (lh_ub, 0, sign)
+ || wi::lt_p (rh_ub, 0, sign))
+ r.set_nonzero (type);
+ else
+ r.set_varying (type);
+ return;
+ }
+ value_range_with_overflow (r, type, new_lb, new_ub);
}
bool
i1 = int_range<1> (integer_type_node);
op_bitwise_and.op1_range (res, integer_type_node, i1, i2);
ASSERT_TRUE (res == int_range<1> (integer_type_node));
+
+ // (NONZERO | X) is nonzero.
+ i1.set_nonzero (integer_type_node);
+ i2.set_varying (integer_type_node);
+ op_bitwise_or.fold_range (res, integer_type_node, i1, i2);
+ ASSERT_TRUE (res.nonzero_p ());
+
+ // (NEGATIVE | X) is nonzero.
+ i1 = int_range<1> (INT (-5), INT (-3));
+ i2.set_varying (integer_type_node);
+ op_bitwise_or.fold_range (res, integer_type_node, i1, i2);
+ ASSERT_FALSE (res.contains_p (INT (0)));
}
void