vyre 0.4.0

GPU compute intermediate representation with a standard operation library
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

//! Base64 decode operation as an IR composition.

/// CPU-independent IR kernel for contiguous RFC 4648 base64 runs.
pub mod kernel {
    use super::super::shared::{and, in_range, BYTE_BOUNDED_LAWS};
    use crate::ir::{BufferDecl, DataType, Expr, Node, Program};
    use crate::ops::{OpSpec, BYTES_TO_BYTES_INPUTS, BYTES_TO_BYTES_OUTPUTS};

    /// GPU region decoder for contiguous RFC 4648 base64 runs.
    #[derive(Debug, Clone, Copy, Default)]
    pub struct Base64Decode;

    impl Base64Decode {
        /// Declarative operation specification.
        pub const SPEC: OpSpec = OpSpec::composition(
            "decode.base64",
            BYTES_TO_BYTES_INPUTS,
            BYTES_TO_BYTES_OUTPUTS,
            BYTE_BOUNDED_LAWS,
            Self::program,
        );

        /// Build the canonical IR program.
        #[must_use]
        pub fn program() -> Program {
            let idx = Expr::var("idx");
            let out_idx = Expr::mul(idx.clone(), Expr::u32(3));
            let a = Expr::load("input", Expr::mul(idx.clone(), Expr::u32(4)));
            let b = Expr::load(
                "input",
                Expr::add(Expr::mul(idx.clone(), Expr::u32(4)), Expr::u32(1)),
            );
            let c = Expr::load(
                "input",
                Expr::add(Expr::mul(idx.clone(), Expr::u32(4)), Expr::u32(2)),
            );
            let d = Expr::load(
                "input",
                Expr::add(Expr::mul(idx.clone(), Expr::u32(4)), Expr::u32(3)),
            );
            Program::new(
                vec![
                    BufferDecl::read("input", 0, DataType::Bytes),
                    BufferDecl::output("out", 1, DataType::Bytes),
                ],
                [64, 1, 1],
                vec![
                    Node::let_bind("idx", Expr::gid_x()),
                    Node::if_then(
                        and(
                            Expr::lt(
                                Expr::add(Expr::mul(idx.clone(), Expr::u32(4)), Expr::u32(3)),
                                Expr::buf_len("input"),
                            ),
                            Expr::lt(
                                Expr::add(out_idx.clone(), Expr::u32(2)),
                                Expr::buf_len("out"),
                            ),
                        ),
                        vec![
                            Node::let_bind("a6", decode_value(a)),
                            Node::let_bind("b6", decode_value(b)),
                            Node::let_bind("c6", decode_value(c)),
                            Node::let_bind("d6", decode_value(d)),
                            Node::store("out", out_idx.clone(), byte0()),
                            Node::store("out", Expr::add(out_idx.clone(), Expr::u32(1)), byte1()),
                            Node::store("out", Expr::add(out_idx, Expr::u32(2)), byte2()),
                        ],
                    ),
                ],
            )
        }
    }

    /// Decode one base64 alphabet byte to a 6-bit value.
    #[must_use]
    pub fn decode_value(byte: Expr) -> Expr {
        let upper = in_range(byte.clone(), b'A', b'Z');
        let lower = in_range(byte.clone(), b'a', b'z');
        let digit = in_range(byte.clone(), b'0', b'9');
        let plus = Expr::eq(byte.clone(), Expr::u32(u32::from(b'+')));
        let slash = Expr::eq(byte.clone(), Expr::u32(u32::from(b'/')));
        Expr::select(
            upper,
            Expr::sub(byte.clone(), Expr::u32(u32::from(b'A'))),
            Expr::select(
                lower,
                Expr::add(
                    Expr::sub(byte.clone(), Expr::u32(u32::from(b'a'))),
                    Expr::u32(26),
                ),
                Expr::select(
                    digit,
                    Expr::add(Expr::sub(byte, Expr::u32(u32::from(b'0'))), Expr::u32(52)),
                    Expr::select(
                        plus,
                        Expr::u32(62),
                        Expr::select(slash, Expr::u32(63), Expr::u32(0)),
                    ),
                ),
            ),
        )
    }

    #[must_use]
    pub fn byte0() -> Expr {
        Expr::bitor(
            Expr::shl(Expr::var("a6"), Expr::u32(2)),
            Expr::shr(Expr::var("b6"), Expr::u32(4)),
        )
    }

    #[must_use]
    pub fn byte1() -> Expr {
        Expr::bitor(
            Expr::shl(Expr::bitand(Expr::var("b6"), Expr::u32(0x0f)), Expr::u32(4)),
            Expr::shr(Expr::var("c6"), Expr::u32(2)),
        )
    }

    #[must_use]
    pub fn byte2() -> Expr {
        Expr::bitor(
            Expr::shl(Expr::bitand(Expr::var("c6"), Expr::u32(0x03)), Expr::u32(6)),
            Expr::var("d6"),
        )
    }
}

pub use kernel::Base64Decode;