bjoernager/rust
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enhance u128 overflow tests

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This commit is contained in:
est31 2017-01-01 19:53:12 +01:00
parent 9c0e373f91
commit 1fefa3cc91
2 changed files with 23 additions and 2 deletions
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8
src/test/run-pass/i128.rs
View file

@ -96,4 +96,12 @@ fn main() {
assert_eq!((-z).checked_mul(-z), Some(0x734C_C2F2_A521));
assert_eq!((z).checked_mul(z), Some(0x734C_C2F2_A521));
assert_eq!((k).checked_mul(k), None);
let l: i128 = b(i128::min_value());
let o: i128 = b(17);
assert_eq!(l.checked_sub(b(2)), None);
assert_eq!(l.checked_add(l), None);
assert_eq!((-(l + 1)).checked_add(2), None);
assert_eq!(l.checked_sub(l), Some(0));
assert_eq!(b(1u128).checked_shl(b(127)), Some(1 << 127));
assert_eq!(o.checked_shl(b(128)), None);
}

17
src/test/run-pass/u128.rs
View file

@ -10,7 +10,10 @@
// ignore-stage0
// ignore-stage1
#![feature(i128_type)]
#![feature(i128_type, test)]
extern crate test;
use test::black_box as b;
fn main() {
let x: u128 = 0xFFFF_FFFF_FFFF_FFFF__FFFF_FFFF_FFFF_FFFF;
@ -63,5 +66,15 @@ fn main() {
format!("{}", u128::max_value()));
assert_eq!("147573952589676412928", format!("{:?}", j));
// common traits
x.clone();
assert_eq!(x, b(x.clone()));
// overflow checks
assert_eq!((z).checked_mul(z), Some(0x734C_C2F2_A521));
assert_eq!((k).checked_mul(k), None);
let l: u128 = b(u128::max_value() - 10);
let o: u128 = b(17);
assert_eq!(l.checked_add(b(11)), None);
assert_eq!(l.checked_sub(l), Some(0));
assert_eq!(o.checked_sub(b(18)), None);
assert_eq!(b(1u128).checked_shl(b(127)), Some(1 << 127));
assert_eq!(o.checked_shl(b(128)), None);
}