60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
// run-pass
|
|
// ignore-emscripten FIXME(#45351) hits an LLVM assert
|
|
|
|
#![feature(repr_simd, platform_intrinsics)]
|
|
|
|
extern "platform-intrinsic" {
|
|
fn simd_cast<T, U>(x: T) -> U;
|
|
}
|
|
|
|
use std::cmp::{max, min};
|
|
|
|
#[derive(Copy, Clone)]
|
|
#[repr(simd)]
|
|
struct V<T>([T; 2]);
|
|
|
|
fn main() {
|
|
unsafe {
|
|
let u = V::<u32>([i16::MIN as u32, i16::MAX as u32]);
|
|
let i: V<i16> = simd_cast(u);
|
|
assert_eq!(i.0[0], u.0[0] as i16);
|
|
assert_eq!(i.0[1], u.0[1] as i16);
|
|
}
|
|
|
|
unsafe {
|
|
let f = V::<f32>([i16::MIN as f32, i16::MAX as f32]);
|
|
let i: V<i16> = simd_cast(f);
|
|
assert_eq!(i.0[0], f.0[0] as i16);
|
|
assert_eq!(i.0[1], f.0[1] as i16);
|
|
}
|
|
|
|
unsafe {
|
|
let f = V::<f32>([u8::MIN as f32, u8::MAX as f32]);
|
|
let u: V<u8> = simd_cast(f);
|
|
assert_eq!(u.0[0], f.0[0] as u8);
|
|
assert_eq!(u.0[1], f.0[1] as u8);
|
|
}
|
|
|
|
unsafe {
|
|
// We would like to do isize::MIN..=isize::MAX, but those values are not representable in
|
|
// an f64, so we clamp to the range of an i32 to prevent running into UB.
|
|
let f = V::<f64>([
|
|
max(isize::MIN, i32::MIN as isize) as f64,
|
|
min(isize::MAX, i32::MAX as isize) as f64,
|
|
]);
|
|
let i: V<isize> = simd_cast(f);
|
|
assert_eq!(i.0[0], f.0[0] as isize);
|
|
assert_eq!(i.0[1], f.0[1] as isize);
|
|
}
|
|
|
|
unsafe {
|
|
let f = V::<f64>([
|
|
max(usize::MIN, u32::MIN as usize) as f64,
|
|
min(usize::MAX, u32::MAX as usize) as f64,
|
|
]);
|
|
let u: V<usize> = simd_cast(f);
|
|
assert_eq!(u.0[0], f.0[0] as usize);
|
|
assert_eq!(u.0[1], f.0[1] as usize);
|
|
}
|
|
}
|