[go: up one dir, main page]

arrow2 0.7.1

Unofficial implementation of Apache Arrow spec in safe Rust
Documentation 
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

pub use packed_simd::{
    f32x16, f64x8, i16x32, i32x16, i64x8, i8x64, m16x32, m32x16, m64x8, m8x64, u16x32, u32x16,
    u64x8, u8x64,
};

use super::*;

macro_rules! simd {
    ($name:tt, $type:ty, $lanes:expr, $chunk:ty, $mask:tt) => {
        unsafe impl NativeSimd for $name {
            const LANES: usize = $lanes;
            type Native = $type;
            type Chunk = $chunk;
            type Mask = $mask;

            #[inline]
            fn select(self, mask: $mask, default: Self) -> Self {
                mask.select(self, default)
            }

            #[inline]
            fn from_chunk(v: &[$type]) -> Self {
                <$name>::from_slice_unaligned(v)
            }

            #[inline]
            fn from_incomplete_chunk(v: &[$type], remaining: $type) -> Self {
                let mut a = [remaining; $lanes];
                a.iter_mut().zip(v.iter()).for_each(|(a, b)| *a = *b);
                <$name>::from_chunk(a.as_ref())
            }

            #[inline]
            fn align(values: &[Self::Native]) -> (&[Self::Native], &[Self], &[Self::Native]) {
                unsafe { values.align_to::<Self>() }
            }
        }
    };
}

simd!(u8x64, u8, 64, u64, m8x64);
simd!(u16x32, u16, 32, u32, m16x32);
simd!(u32x16, u32, 16, u16, m32x16);
simd!(u64x8, u64, 8, u8, m64x8);
simd!(i8x64, i8, 64, u64, m8x64);
simd!(i16x32, i16, 32, u32, m16x32);
simd!(i32x16, i32, 16, u16, m32x16);
simd!(i64x8, i64, 8, u8, m64x8);
simd!(f32x16, f32, 16, u16, m32x16);
simd!(f64x8, f64, 8, u8, m64x8);

macro_rules! chunk_macro {
    ($type:ty, $chunk:ty, $simd:ty, $mask:tt, $m:expr) => {
        impl FromMaskChunk<$chunk> for $mask {
            #[inline]
            fn from_chunk(chunk: $chunk) -> Self {
                ($m)(chunk)
            }
        }
    };
}

chunk_macro!(u8, u64, u8x64, m8x64, from_chunk_u64);
chunk_macro!(u16, u32, u16x32, m16x32, from_chunk_u32);
chunk_macro!(u32, u16, u32x16, m32x16, from_chunk_u16);
chunk_macro!(u64, u8, u64x8, m64x8, from_chunk_u8);

#[inline]
fn from_chunk_u8(chunk: u8) -> m64x8 {
    let idx = u64x8::new(1, 2, 4, 8, 16, 32, 64, 128);
    let vecmask = u64x8::splat(chunk as u64);

    (idx & vecmask).eq(idx)
}

#[inline]
fn from_chunk_u16(chunk: u16) -> m32x16 {
    let idx = u32x16::new(
        1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768,
    );
    let vecmask = u32x16::splat(chunk as u32);

    (idx & vecmask).eq(idx)
}

#[inline]
fn from_chunk_u32(chunk: u32) -> m16x32 {
    let idx = u16x32::new(
        1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 1, 2, 4, 8,
        16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768,
    );
    let left = u16x32::from_chunk(&[
        1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    ]);
    let right = u16x32::from_chunk(&[
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512,
        1024, 2048, 4096, 8192, 16384, 32768,
    ]);

    let a = chunk.to_ne_bytes();
    let a1 = u16::from_ne_bytes([a[2], a[3]]);
    let a2 = u16::from_ne_bytes([a[0], a[1]]);

    let vecmask1 = u16x32::splat(a1);
    let vecmask2 = u16x32::splat(a2);

    (idx & left & vecmask1).eq(idx) | (idx & right & vecmask2).eq(idx)
}

#[inline]
fn from_chunk_u64(chunk: u64) -> m8x64 {
    let idx = u8x64::new(
        1, 2, 4, 8, 16, 32, 64, 128, 1, 2, 4, 8, 16, 32, 64, 128, 1, 2, 4, 8, 16, 32, 64, 128, 1,
        2, 4, 8, 16, 32, 64, 128, 1, 2, 4, 8, 16, 32, 64, 128, 1, 2, 4, 8, 16, 32, 64, 128, 1, 2,
        4, 8, 16, 32, 64, 128, 1, 2, 4, 8, 16, 32, 64, 128,
    );
    let idxs = [
        u8x64::from_chunk(&[
            1, 2, 4, 8, 16, 32, 64, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16,
            32, 64, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 8, 16, 32, 64, 128,
            0, 0, 0, 0, 0, 0, 0, 0,
        ]),
        u8x64::from_chunk(&[
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2,
            4, 8, 16, 32, 64, 128,
        ]),
    ];

    let a = chunk.to_ne_bytes();

    let mut result = m8x64::default();
    for i in 0..8 {
        result |= (idxs[i] & u8x64::splat(a[i])).eq(idx)
    }

    result
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_basic1() {
        let a = 0b00000001000000010000000100000001u32;
        let a = from_chunk_u32(a);
        for i in 0..32 {
            assert_eq!(a.extract(i), i % 8 == 0)
        }
    }

    #[test]
    fn test_basic2() {
        let a = 0b0000000100000001000000010000000100000001000000010000000100000001u64;
        let a = from_chunk_u64(a);
        for i in 0..64 {
            assert_eq!(a.extract(i), i % 8 == 0)
        }
    }
}