mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-05 13:13:40 +00:00
57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
// run-pass
|
|
#![feature(test)]
|
|
#![allow(invalid_nan_comparisons)]
|
|
|
|
extern crate test;
|
|
|
|
use std::mem::size_of;
|
|
use test::black_box;
|
|
|
|
// Ensure the const-eval result and runtime result of float comparison are equivalent.
|
|
|
|
macro_rules! compare {
|
|
($op:tt) => {
|
|
compare!(
|
|
[f64::NEG_INFINITY, -f64::MAX, -1.0, -0.0, 0.0, 1.0, f64::MAX, f64::INFINITY, f64::NAN],
|
|
$op
|
|
);
|
|
};
|
|
([$($lhs:expr),+], $op:tt) => {
|
|
$(compare!(
|
|
$lhs,
|
|
$op,
|
|
[f64::NEG_INFINITY, -f64::MAX, -1.0, -0.0, 0.0, 1.0, f64::MAX, f64::INFINITY, f64::NAN]
|
|
);)+
|
|
};
|
|
($lhs:expr, $op:tt, [$($rhs:expr),+]) => {
|
|
$({
|
|
// Wrap the check in its own function to reduce time needed to borrowck.
|
|
fn check() {
|
|
static CONST_EVAL: bool = $lhs $op $rhs;
|
|
let runtime_eval = black_box($lhs) $op black_box($rhs);
|
|
assert_eq!(CONST_EVAL, runtime_eval, stringify!($lhs $op $rhs));
|
|
assert_eq!(
|
|
size_of::<[u8; ($lhs $op $rhs) as usize]>(),
|
|
runtime_eval as usize,
|
|
stringify!($lhs $op $rhs (forced const eval))
|
|
);
|
|
}
|
|
check();
|
|
})+
|
|
};
|
|
}
|
|
|
|
fn main() {
|
|
assert_eq!(0.0/0.0 < 0.0/0.0, false);
|
|
assert_eq!(0.0/0.0 > 0.0/0.0, false);
|
|
assert_eq!(f64::NAN < f64::NAN, false);
|
|
assert_eq!(f64::NAN > f64::NAN, false);
|
|
|
|
compare!(==);
|
|
compare!(!=);
|
|
compare!(<);
|
|
compare!(<=);
|
|
compare!(>);
|
|
compare!(>=);
|
|
}
|