1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
//@ run-pass
//@ ignore-emscripten
// Test that the simd_{gather,scatter} intrinsics produce the correct results.
#![feature(repr_simd, core_intrinsics)]
#![allow(non_camel_case_types)]
#[path = "../../../auxiliary/minisimd.rs"]
mod minisimd;
use minisimd::*;
use std::intrinsics::simd::{simd_gather, simd_scatter};
type x4<T> = Simd<T, 4>;
fn main() {
let mut x = [0_f32, 1., 2., 3., 4., 5., 6., 7.];
let default = x4::from_array([-3_f32, -3., -3., -3.]);
let s_strided = x4::from_array([0_f32, 2., -3., 6.]);
let mask = x4::from_array([-1_i32, -1, 0, -1]);
// reading from *const
unsafe {
let pointer = x.as_ptr();
let pointers =
x4::from_array(std::array::from_fn(|i| pointer.add(i * 2)));
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::from_array(std::array::from_fn(|i| pointer.add(i * 2)));
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::from_array(std::array::from_fn(|i| pointer.add(i * 2)));
let values = x4::from_array([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::from_array([y[0], y[0], y[0], y[0]]);
let s_strided = x4::from_array([y[0], y[2], y[0], y[6]]);
// reading from *const
unsafe {
let pointer = y.as_ptr();
let pointers =
x4::from_array(std::array::from_fn(|i| pointer.add(i * 2)));
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::from_array(std::array::from_fn(|i| pointer.add(i * 2)));
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::from_array(std::array::from_fn(|i| pointer.add(i * 2)));
let values = x4::from_array([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);
}
}
|
