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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
#![allow(unused_imports)]
use super::MaskElement;
use crate::simd::intrinsics;
use crate::simd::{LaneCount, Simd, SupportedLaneCount};
use core::marker::PhantomData;
/// A mask where each lane is represented by a single bit.
#[repr(transparent)]
pub struct Mask<T, const LANES: usize>(
<LaneCount<LANES> as SupportedLaneCount>::BitMask,
PhantomData<T>,
)
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount;
impl<T, const LANES: usize> Copy for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
}
impl<T, const LANES: usize> Clone for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn clone(&self) -> Self {
*self
}
}
impl<T, const LANES: usize> PartialEq for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn eq(&self, other: &Self) -> bool {
self.0.as_ref() == other.0.as_ref()
}
}
impl<T, const LANES: usize> PartialOrd for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
self.0.as_ref().partial_cmp(other.0.as_ref())
}
}
impl<T, const LANES: usize> Eq for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
}
impl<T, const LANES: usize> Ord for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn cmp(&self, other: &Self) -> core::cmp::Ordering {
self.0.as_ref().cmp(other.0.as_ref())
}
}
impl<T, const LANES: usize> Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub fn splat(value: bool) -> Self {
let mut mask = <LaneCount<LANES> as SupportedLaneCount>::BitMask::default();
if value {
mask.as_mut().fill(u8::MAX)
} else {
mask.as_mut().fill(u8::MIN)
}
if LANES % 8 > 0 {
*mask.as_mut().last_mut().unwrap() &= u8::MAX >> (8 - LANES % 8);
}
Self(mask, PhantomData)
}
#[inline]
#[must_use = "method returns a new bool and does not mutate the original value"]
pub unsafe fn test_unchecked(&self, lane: usize) -> bool {
(self.0.as_ref()[lane / 8] >> (lane % 8)) & 0x1 > 0
}
#[inline]
pub unsafe fn set_unchecked(&mut self, lane: usize, value: bool) {
unsafe {
self.0.as_mut()[lane / 8] ^= ((value ^ self.test_unchecked(lane)) as u8) << (lane % 8)
}
}
#[inline]
#[must_use = "method returns a new vector and does not mutate the original value"]
pub fn to_int(self) -> Simd<T, LANES> {
unsafe {
crate::intrinsics::simd_select_bitmask(
self.0,
Simd::splat(T::TRUE),
Simd::splat(T::FALSE),
)
}
}
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub unsafe fn from_int_unchecked(value: Simd<T, LANES>) -> Self {
unsafe { Self(crate::intrinsics::simd_bitmask(value), PhantomData) }
}
#[cfg(feature = "generic_const_exprs")]
#[inline]
#[must_use = "method returns a new array and does not mutate the original value"]
pub fn to_bitmask(self) -> [u8; LaneCount::<LANES>::BITMASK_LEN] {
// Safety: these are the same type and we are laundering the generic
unsafe { core::mem::transmute_copy(&self.0) }
}
#[cfg(feature = "generic_const_exprs")]
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub fn from_bitmask(bitmask: [u8; LaneCount::<LANES>::BITMASK_LEN]) -> Self {
// Safety: these are the same type and we are laundering the generic
Self(unsafe { core::mem::transmute_copy(&bitmask) }, PhantomData)
}
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub fn convert<U>(self) -> Mask<U, LANES>
where
U: MaskElement,
{
unsafe { core::mem::transmute_copy(&self) }
}
#[inline]
#[must_use = "method returns a new bool and does not mutate the original value"]
pub fn any(self) -> bool {
self != Self::splat(false)
}
#[inline]
#[must_use = "method returns a new bool and does not mutate the original value"]
pub fn all(self) -> bool {
self == Self::splat(true)
}
}
impl<T, const LANES: usize> core::ops::BitAnd for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
<LaneCount<LANES> as SupportedLaneCount>::BitMask: AsRef<[u8]> + AsMut<[u8]>,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn bitand(mut self, rhs: Self) -> Self {
for (l, r) in self.0.as_mut().iter_mut().zip(rhs.0.as_ref().iter()) {
*l &= r;
}
self
}
}
impl<T, const LANES: usize> core::ops::BitOr for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
<LaneCount<LANES> as SupportedLaneCount>::BitMask: AsRef<[u8]> + AsMut<[u8]>,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn bitor(mut self, rhs: Self) -> Self {
for (l, r) in self.0.as_mut().iter_mut().zip(rhs.0.as_ref().iter()) {
*l |= r;
}
self
}
}
impl<T, const LANES: usize> core::ops::BitXor for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn bitxor(mut self, rhs: Self) -> Self::Output {
for (l, r) in self.0.as_mut().iter_mut().zip(rhs.0.as_ref().iter()) {
*l ^= r;
}
self
}
}
impl<T, const LANES: usize> core::ops::Not for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn not(mut self) -> Self::Output {
for x in self.0.as_mut() {
*x = !*x;
}
if LANES % 8 > 0 {
*self.0.as_mut().last_mut().unwrap() &= u8::MAX >> (8 - LANES % 8);
}
self
}
}
|
