mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 07:14:28 +00:00
64 lines
2.3 KiB
Rust
64 lines
2.3 KiB
Rust
// compile-flags: -Zmir-opt-level=0
|
|
// run-pass
|
|
|
|
#![feature(const_float_bits_conv)]
|
|
#![feature(const_float_classify)]
|
|
#![allow(unused_macro_rules)]
|
|
|
|
// Don't promote
|
|
const fn nop<T>(x: T) -> T { x }
|
|
|
|
macro_rules! const_assert {
|
|
($a:expr) => {
|
|
{
|
|
const _: () = assert!($a);
|
|
assert!(nop($a));
|
|
}
|
|
};
|
|
($a:expr, $b:expr) => {
|
|
{
|
|
const _: () = assert!($a == $b);
|
|
assert_eq!(nop($a), nop($b));
|
|
}
|
|
};
|
|
}
|
|
|
|
fn f32() {
|
|
const_assert!((1f32).to_bits(), 0x3f800000);
|
|
const_assert!(u32::from_be_bytes(1f32.to_be_bytes()), 0x3f800000);
|
|
const_assert!((12.5f32).to_bits(), 0x41480000);
|
|
const_assert!(u32::from_le_bytes(12.5f32.to_le_bytes()), 0x41480000);
|
|
const_assert!((1337f32).to_bits(), 0x44a72000);
|
|
const_assert!(u32::from_ne_bytes(1337f32.to_ne_bytes()), 0x44a72000);
|
|
const_assert!((-14.25f32).to_bits(), 0xc1640000);
|
|
const_assert!(f32::from_bits(0x3f800000), 1.0);
|
|
const_assert!(f32::from_be_bytes(0x3f800000u32.to_be_bytes()), 1.0);
|
|
const_assert!(f32::from_bits(0x41480000), 12.5);
|
|
const_assert!(f32::from_le_bytes(0x41480000u32.to_le_bytes()), 12.5);
|
|
const_assert!(f32::from_bits(0x44a72000), 1337.0);
|
|
const_assert!(f32::from_ne_bytes(0x44a72000u32.to_ne_bytes()), 1337.0);
|
|
const_assert!(f32::from_bits(0xc1640000), -14.25);
|
|
}
|
|
|
|
fn f64() {
|
|
const_assert!((1f64).to_bits(), 0x3ff0000000000000);
|
|
const_assert!(u64::from_be_bytes(1f64.to_be_bytes()), 0x3ff0000000000000);
|
|
const_assert!((12.5f64).to_bits(), 0x4029000000000000);
|
|
const_assert!(u64::from_le_bytes(12.5f64.to_le_bytes()), 0x4029000000000000);
|
|
const_assert!((1337f64).to_bits(), 0x4094e40000000000);
|
|
const_assert!(u64::from_ne_bytes(1337f64.to_ne_bytes()), 0x4094e40000000000);
|
|
const_assert!((-14.25f64).to_bits(), 0xc02c800000000000);
|
|
const_assert!(f64::from_bits(0x3ff0000000000000), 1.0);
|
|
const_assert!(f64::from_be_bytes(0x3ff0000000000000u64.to_be_bytes()), 1.0);
|
|
const_assert!(f64::from_bits(0x4029000000000000), 12.5);
|
|
const_assert!(f64::from_le_bytes(0x4029000000000000u64.to_le_bytes()), 12.5);
|
|
const_assert!(f64::from_bits(0x4094e40000000000), 1337.0);
|
|
const_assert!(f64::from_ne_bytes(0x4094e40000000000u64.to_ne_bytes()), 1337.0);
|
|
const_assert!(f64::from_bits(0xc02c800000000000), -14.25);
|
|
}
|
|
|
|
fn main() {
|
|
f32();
|
|
f64();
|
|
}
|