mirror of https://github.com/rust-lang/rust
59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
//@[old]run-pass
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//@[generic_with_fn]run-pass
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//@ revisions: old generic generic_with_fn
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#![feature(repr_simd, intrinsics, adt_const_params, generic_const_exprs)]
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#![allow(incomplete_features)]
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extern "rust-intrinsic" {
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#[cfg(old)]
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fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
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#[cfg(any(generic, generic_with_fn))]
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fn simd_shuffle_generic<T, U, const I: &'static [u32]>(a: T, b: T) -> U;
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}
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#[derive(Copy, Clone)]
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#[repr(simd)]
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struct Simd<T, const N: usize>([T; N]);
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trait Shuffle<const N: usize> {
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const I: [u32; N];
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const J: &'static [u32] = &Self::I;
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unsafe fn shuffle<T, const M: usize>(&self, a: Simd<T, M>, b: Simd<T, M>) -> Simd<T, N>
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where
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Thing<{ Self::J }>:,
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{
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#[cfg(old)]
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return simd_shuffle(a, b, Self::I);
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#[cfg(generic)]
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return simd_shuffle_generic::<_, _, { &Self::I }>(a, b);
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//[generic]~^ overly complex generic constant
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#[cfg(generic_with_fn)]
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return simd_shuffle_generic::<_, _, { Self::J }>(a, b);
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}
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}
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struct Thing<const X: &'static [u32]>;
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fn main() {
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struct I1;
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impl Shuffle<4> for I1 {
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const I: [u32; 4] = [0, 2, 4, 6];
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}
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struct I2;
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impl Shuffle<2> for I2 {
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const I: [u32; 2] = [1, 5];
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}
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let a = Simd::<u8, 4>([0, 1, 2, 3]);
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let b = Simd::<u8, 4>([4, 5, 6, 7]);
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unsafe {
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let x: Simd<u8, 4> = I1.shuffle(a, b);
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assert_eq!(x.0, [0, 2, 4, 6]);
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let y: Simd<u8, 2> = I2.shuffle(a, b);
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assert_eq!(y.0, [1, 5]);
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}
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}
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