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