use consts::{constant_simple, Constant};
-use rustc::lint::*;
use rustc::hir::*;
+use rustc::lint::*;
+use rustc_const_math::ConstInt;
use syntax::codemap::Span;
-use utils::{span_lint, snippet, in_macro};
-use syntax::attr::IntType::{SignedInt, UnsignedInt};
+use utils::{in_macro, snippet, span_lint};
/// **What it does:** Checks for identity operations, e.g. `x + 0`.
///
}
}
+fn all_ones(v: &ConstInt) -> bool {
+ match *v {
+ ConstInt::I8(i) => i == !0,
+ ConstInt::I16(i) => i == !0,
+ ConstInt::I32(i) => i == !0,
+ ConstInt::I64(i) => i == !0,
+ ConstInt::I128(i) => i == !0,
+ ConstInt::U8(i) => i == !0,
+ ConstInt::U16(i) => i == !0,
+ ConstInt::U32(i) => i == !0,
+ ConstInt::U64(i) => i == !0,
+ ConstInt::U128(i) => i == !0,
+ _ => false,
+ }
+}
+
#[allow(cast_possible_wrap)]
fn check(cx: &LateContext, e: &Expr, m: i8, span: Span, arg: Span) {
if let Some(Constant::Int(v)) = constant_simple(cx, e) {
if match m {
0 => v.to_u128_unchecked() == 0,
- -1 => {
- match v.int_type() {
- SignedInt(_) => (v.to_u128_unchecked() as i128 == -1),
- UnsignedInt(_) => false,
- }
- },
+ -1 => all_ones(&v),
1 => v.to_u128_unchecked() == 1,
_ => unreachable!(),
- }
- {
+ } {
span_lint(
cx,
IDENTITY_OP,