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