mirror of https://github.com/rust-lang/rust
68 lines
1.7 KiB
Rust
68 lines
1.7 KiB
Rust
//@ run-pass
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//@ ignore-emscripten
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// Short form of the generic gather/scatter tests,
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// verifying simd([*const T; N]) and simd([*mut T; N]) pass typeck and work.
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#![feature(repr_simd, intrinsics)]
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#![allow(non_camel_case_types)]
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#[repr(simd)]
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#[derive(Copy, Clone, PartialEq, Debug)]
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struct cptrx4<T>([*const T; 4]);
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#[repr(simd)]
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#[derive(Copy, Clone, PartialEq, Debug)]
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struct mptrx4<T>([*mut T; 4]);
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#[repr(simd)]
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#[derive(Copy, Clone, PartialEq, Debug)]
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struct f32x4([f32; 4]);
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#[repr(simd)]
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#[derive(Copy, Clone, PartialEq, Debug)]
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struct i32x4([i32; 4]);
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extern "rust-intrinsic" {
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fn simd_gather<T, U, V>(x: T, y: U, z: V) -> T;
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fn simd_scatter<T, U, V>(x: T, y: U, z: V) -> ();
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}
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fn main() {
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let mut x = [0_f32, 1., 2., 3., 4., 5., 6., 7.];
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let default = f32x4([-3_f32, -3., -3., -3.]);
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let s_strided = f32x4([0_f32, 2., -3., 6.]);
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let mask = i32x4([-1_i32, -1, 0, -1]);
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// reading from *const
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unsafe {
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let pointer = &x as *const f32;
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let pointers = cptrx4([
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pointer.offset(0) as *const f32,
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pointer.offset(2),
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pointer.offset(4),
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pointer.offset(6)
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]);
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let r_strided = simd_gather(default, pointers, mask);
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assert_eq!(r_strided, s_strided);
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}
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// writing to *mut
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unsafe {
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let pointer = &mut x as *mut f32;
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let pointers = mptrx4([
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pointer.offset(0) as *mut f32,
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pointer.offset(2),
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pointer.offset(4),
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pointer.offset(6)
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]);
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let values = f32x4([42_f32, 43_f32, 44_f32, 45_f32]);
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simd_scatter(values, pointers, mask);
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assert_eq!(x, [42., 1., 43., 3., 4., 5., 45., 7.]);
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}
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}
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