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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Operations and constants for `i8`
use num::{BitCount, CheckedAdd, CheckedSub, CheckedMul};
use option::{Option, Some, None};
use unstable::intrinsics;
pub use self::generated::*;
int_module!(i8, 8)
impl BitCount for i8 {
/// Counts the number of bits set. Wraps LLVM's `ctpop` intrinsic.
#[inline]
fn population_count(&self) -> i8 { unsafe { intrinsics::ctpop8(*self) } }
/// Counts the number of leading zeros. Wraps LLVM's `ctlz` intrinsic.
#[inline]
fn leading_zeros(&self) -> i8 { unsafe { intrinsics::ctlz8(*self) } }
/// Counts the number of trailing zeros. Wraps LLVM's `cttz` intrinsic.
#[inline]
fn trailing_zeros(&self) -> i8 { unsafe { intrinsics::cttz8(*self) } }
}
impl CheckedAdd for i8 {
#[inline]
fn checked_add(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_add_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedSub for i8 {
#[inline]
fn checked_sub(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_sub_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
impl CheckedMul for i8 {
#[inline]
fn checked_mul(&self, v: &i8) -> Option<i8> {
unsafe {
let (x, y) = intrinsics::i8_mul_with_overflow(*self, *v);
if y { None } else { Some(x) }
}
}
}
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