142 lines
3.6 KiB
Rust
142 lines
3.6 KiB
Rust
// run-pass
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// ignore-emscripten
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// Test that the simd_{gather,scatter} intrinsics produce the correct results.
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#![feature(repr_simd, platform_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 x4<T>(pub T, pub T, pub T, pub T);
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extern "platform-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 = x4(-3_f32, -3., -3., -3.);
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let s_strided = x4(0_f32, 2., -3., 6.);
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let mask = x4(-1_i32, -1, 0, -1);
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// reading from *const
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unsafe {
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let pointer = &x[0] as *const f32;
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let pointers = x4(
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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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// reading from *mut
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unsafe {
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let pointer = &mut x[0] as *mut f32;
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let pointers = x4(
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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 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[0] as *mut f32;
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let pointers = x4(
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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 = x4(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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// test modifying array of *const f32
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let mut y = [
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&x[0] as *const f32,
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&x[1] as *const f32,
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&x[2] as *const f32,
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&x[3] as *const f32,
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&x[4] as *const f32,
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&x[5] as *const f32,
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&x[6] as *const f32,
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&x[7] as *const f32
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];
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let default = x4(y[0], y[0], y[0], y[0]);
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let s_strided = x4(y[0], y[2], y[0], y[6]);
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// reading from *const
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unsafe {
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let pointer = &y[0] as *const *const f32;
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let pointers = x4(
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pointer.offset(0) as *const *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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// reading from *mut
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unsafe {
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let pointer = &mut y[0] as *mut *const f32;
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let pointers = x4(
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pointer.offset(0) as *mut *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 y[0] as *mut *const f32;
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let pointers = x4(
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pointer.offset(0) as *mut *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 values = x4(y[7], y[6], y[5], y[1]);
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simd_scatter(values, pointers, mask);
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let s = [
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&x[7] as *const f32,
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&x[1] as *const f32,
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&x[6] as *const f32,
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&x[3] as *const f32,
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&x[4] as *const f32,
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&x[5] as *const f32,
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&x[1] as *const f32,
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&x[7] as *const f32
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];
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assert_eq!(y, s);
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}
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}
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