mirror of https://github.com/rust-lang/rust
46 lines
1.4 KiB
Rust
46 lines
1.4 KiB
Rust
//@ run-pass
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//@ revisions: opt noopt
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//@[noopt] compile-flags: -Copt-level=0
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//@[opt] compile-flags: -O
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#![feature(repr_simd, intrinsics)]
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#![allow(incomplete_features)]
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#![feature(adt_const_params)]
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extern "rust-intrinsic" {
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fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> 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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pub unsafe fn __shuffle_vector16<const IDX: [u32; 16], T, U>(x: T, y: T) -> U {
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simd_shuffle(x, y, IDX)
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}
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fn main() {
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const I1: [u32; 4] = [0, 2, 4, 6];
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const I2: [u32; 2] = [1, 5];
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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> = simd_shuffle(a, b, I1);
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assert_eq!(x.0, [0, 2, 4, 6]);
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let y: Simd<u8, 2> = simd_shuffle(a, b, I2);
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assert_eq!(y.0, [1, 5]);
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}
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// Test that an indirection (via an unnamed constant)
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// through a const generic parameter also works.
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// See https://github.com/rust-lang/rust/issues/113500 for details.
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let a = Simd::<u8, 16>([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]);
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let b = Simd::<u8, 16>([16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]);
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unsafe {
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__shuffle_vector16::<
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{ [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] },
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Simd<u8, 16>,
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Simd<u8, 16>,
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>(a, b);
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}
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}
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