mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 18:53:39 +00:00
142 lines
3.4 KiB
Rust
142 lines
3.4 KiB
Rust
//@ run-pass
|
|
//@ ignore-emscripten
|
|
|
|
// Test that the simd_{gather,scatter} intrinsics produce the correct results.
|
|
|
|
#![feature(repr_simd, intrinsics)]
|
|
#![allow(non_camel_case_types)]
|
|
|
|
#[repr(simd)]
|
|
#[derive(Copy, Clone, PartialEq, Debug)]
|
|
struct x4<T>(pub T, pub T, pub T, pub T);
|
|
|
|
extern "rust-intrinsic" {
|
|
fn simd_gather<T, U, V>(x: T, y: U, z: V) -> T;
|
|
fn simd_scatter<T, U, V>(x: T, y: U, z: V) -> ();
|
|
}
|
|
|
|
fn main() {
|
|
let mut x = [0_f32, 1., 2., 3., 4., 5., 6., 7.];
|
|
|
|
let default = x4(-3_f32, -3., -3., -3.);
|
|
let s_strided = x4(0_f32, 2., -3., 6.);
|
|
let mask = x4(-1_i32, -1, 0, -1);
|
|
|
|
// reading from *const
|
|
unsafe {
|
|
let pointer = x.as_ptr();
|
|
let pointers = x4(
|
|
pointer.offset(0),
|
|
pointer.offset(2),
|
|
pointer.offset(4),
|
|
pointer.offset(6)
|
|
);
|
|
|
|
let r_strided = simd_gather(default, pointers, mask);
|
|
|
|
assert_eq!(r_strided, s_strided);
|
|
}
|
|
|
|
// reading from *mut
|
|
unsafe {
|
|
let pointer = x.as_mut_ptr();
|
|
let pointers = x4(
|
|
pointer.offset(0),
|
|
pointer.offset(2),
|
|
pointer.offset(4),
|
|
pointer.offset(6)
|
|
);
|
|
|
|
let r_strided = simd_gather(default, pointers, mask);
|
|
|
|
assert_eq!(r_strided, s_strided);
|
|
}
|
|
|
|
// writing to *mut
|
|
unsafe {
|
|
let pointer = x.as_mut_ptr();
|
|
let pointers = x4(
|
|
pointer.offset(0),
|
|
pointer.offset(2),
|
|
pointer.offset(4),
|
|
pointer.offset(6)
|
|
);
|
|
|
|
let values = x4(42_f32, 43_f32, 44_f32, 45_f32);
|
|
simd_scatter(values, pointers, mask);
|
|
|
|
assert_eq!(x, [42., 1., 43., 3., 4., 5., 45., 7.]);
|
|
}
|
|
|
|
// test modifying array of *const f32
|
|
let mut y = [
|
|
&x[0] as *const f32,
|
|
&x[1] as *const f32,
|
|
&x[2] as *const f32,
|
|
&x[3] as *const f32,
|
|
&x[4] as *const f32,
|
|
&x[5] as *const f32,
|
|
&x[6] as *const f32,
|
|
&x[7] as *const f32
|
|
];
|
|
|
|
let default = x4(y[0], y[0], y[0], y[0]);
|
|
let s_strided = x4(y[0], y[2], y[0], y[6]);
|
|
|
|
// reading from *const
|
|
unsafe {
|
|
let pointer = y.as_ptr();
|
|
let pointers = x4(
|
|
pointer.offset(0),
|
|
pointer.offset(2),
|
|
pointer.offset(4),
|
|
pointer.offset(6)
|
|
);
|
|
|
|
let r_strided = simd_gather(default, pointers, mask);
|
|
|
|
assert_eq!(r_strided, s_strided);
|
|
}
|
|
|
|
// reading from *mut
|
|
unsafe {
|
|
let pointer = y.as_mut_ptr();
|
|
let pointers = x4(
|
|
pointer.offset(0),
|
|
pointer.offset(2),
|
|
pointer.offset(4),
|
|
pointer.offset(6)
|
|
);
|
|
|
|
let r_strided = simd_gather(default, pointers, mask);
|
|
|
|
assert_eq!(r_strided, s_strided);
|
|
}
|
|
|
|
// writing to *mut
|
|
unsafe {
|
|
let pointer = y.as_mut_ptr();
|
|
let pointers = x4(
|
|
pointer.offset(0),
|
|
pointer.offset(2),
|
|
pointer.offset(4),
|
|
pointer.offset(6)
|
|
);
|
|
|
|
let values = x4(y[7], y[6], y[5], y[1]);
|
|
simd_scatter(values, pointers, mask);
|
|
|
|
let s = [
|
|
&x[7] as *const f32,
|
|
&x[1] as *const f32,
|
|
&x[6] as *const f32,
|
|
&x[3] as *const f32,
|
|
&x[4] as *const f32,
|
|
&x[5] as *const f32,
|
|
&x[1] as *const f32,
|
|
&x[7] as *const f32
|
|
];
|
|
assert_eq!(y, s);
|
|
}
|
|
}
|