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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// ignore-emscripten | ||
// min-llvm-version 6.0 | ||
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// Test that the simd_{gather,scatter} intrinsics produce the correct results. | ||
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#![feature(repr_simd, platform_intrinsics)] | ||
#![allow(non_camel_case_types)] | ||
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#[repr(simd)] | ||
#[derive(Copy, Clone, PartialEq, Debug)] | ||
struct x4<T>(pub T, pub T, pub T, pub T); | ||
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extern "platform-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) -> (); | ||
} | ||
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fn main() { | ||
let mut x = [0_f32, 1., 2., 3., 4., 5., 6., 7.]; | ||
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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); | ||
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// reading from *const | ||
unsafe { | ||
let pointer = &x[0] as *const f32; | ||
let pointers = x4( | ||
pointer.offset(0) as *const f32, | ||
pointer.offset(2), | ||
pointer.offset(4), | ||
pointer.offset(6) | ||
); | ||
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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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// reading from *mut | ||
unsafe { | ||
let pointer = &mut x[0] as *mut f32; | ||
let pointers = x4( | ||
pointer.offset(0) as *mut f32, | ||
pointer.offset(2), | ||
pointer.offset(4), | ||
pointer.offset(6) | ||
); | ||
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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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// writing to *mut | ||
unsafe { | ||
let pointer = &mut x[0] as *mut f32; | ||
let pointers = x4( | ||
pointer.offset(0) as *mut f32, | ||
pointer.offset(2), | ||
pointer.offset(4), | ||
pointer.offset(6) | ||
); | ||
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let values = x4(42_f32, 43_f32, 44_f32, 45_f32); | ||
simd_scatter(values, pointers, mask); | ||
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assert_eq!(x, [42., 1., 43., 3., 4., 5., 45., 7.]); | ||
} | ||
} |