tensorlogic-compiler 0.1.0

Compiler for transforming logic expressions into tensor computation graphs
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

//! Partial-evaluation arms for binary arithmetic nodes: `Add`, `Sub`, `Mul`,
//! `Div`, `Pow`, `Mod`, `Min`, `Max`.

use tensorlogic_ir::TLExpr;

use super::helpers::as_constant;
use super::pe_core::pe_rec;
use super::types::{PEConfig, PEEnv, PEStats};

/// Attempt to partially evaluate an arithmetic node. Returns `Ok(result)` when
/// handled; `Err(expr)` to pass the unchanged expression to the next category.
pub(super) fn try_pe_arith(
    expr: TLExpr,
    env: &PEEnv,
    config: &PEConfig,
    depth: usize,
    stats: &mut PEStats,
) -> Result<TLExpr, TLExpr> {
    match expr {
        TLExpr::Add(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                match (as_constant(&la), as_constant(&ra)) {
                    (Some(a), Some(b)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(a + b));
                    }
                    (Some(0.0), None) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(ra);
                    }
                    (None, Some(0.0)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(la);
                    }
                    _ => {}
                }
            }
            Ok(TLExpr::Add(Box::new(la), Box::new(ra)))
        }

        TLExpr::Sub(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                match (as_constant(&la), as_constant(&ra)) {
                    (Some(a), Some(b)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(a - b));
                    }
                    (_, Some(0.0)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(la);
                    }
                    _ => {}
                }
            }
            Ok(TLExpr::Sub(Box::new(la), Box::new(ra)))
        }

        TLExpr::Mul(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                match (as_constant(&la), as_constant(&ra)) {
                    (Some(a), Some(b)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(a * b));
                    }
                    (Some(0.0), _) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(0.0));
                    }
                    (_, Some(0.0)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(0.0));
                    }
                    (Some(1.0), _) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(ra);
                    }
                    (_, Some(1.0)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(la);
                    }
                    _ => {}
                }
            }
            Ok(TLExpr::Mul(Box::new(la), Box::new(ra)))
        }

        TLExpr::Div(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                match (as_constant(&la), as_constant(&ra)) {
                    (Some(a), Some(b)) if b != 0.0 => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(a / b));
                    }
                    (_, Some(1.0)) => {
                        // Div by 1 → numerator
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(la);
                    }
                    _ => {} // Div by zero: keep symbolic — do NOT fold
                }
            }
            Ok(TLExpr::Div(Box::new(la), Box::new(ra)))
        }

        TLExpr::Pow(base_expr, exp_expr) => {
            let ba = pe_rec(*base_expr, env, config, depth + 1, stats);
            let ea = pe_rec(*exp_expr, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                match (as_constant(&ba), as_constant(&ea)) {
                    (Some(b), Some(e)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(b.powf(e)));
                    }
                    (_, Some(0.0)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(1.0));
                    }
                    (_, Some(1.0)) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(ba);
                    }
                    (Some(0.0), _) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(0.0));
                    }
                    (Some(1.0), _) => {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(1.0));
                    }
                    _ => {}
                }
            }
            Ok(TLExpr::Pow(Box::new(ba), Box::new(ea)))
        }

        TLExpr::Mod(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                if let (Some(a), Some(b)) = (as_constant(&la), as_constant(&ra)) {
                    if b != 0.0 {
                        stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                        return Ok(TLExpr::Constant(a % b));
                    }
                }
            }
            Ok(TLExpr::Mod(Box::new(la), Box::new(ra)))
        }

        TLExpr::Min(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                if let (Some(a), Some(b)) = (as_constant(&la), as_constant(&ra)) {
                    stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                    return Ok(TLExpr::Constant(a.min(b)));
                }
            }
            Ok(TLExpr::Min(Box::new(la), Box::new(ra)))
        }

        TLExpr::Max(lhs, rhs) => {
            let la = pe_rec(*lhs, env, config, depth + 1, stats);
            let ra = pe_rec(*rhs, env, config, depth + 1, stats);
            if config.fold_arithmetic {
                if let (Some(a), Some(b)) = (as_constant(&la), as_constant(&ra)) {
                    stats.nodes_reduced = stats.nodes_reduced.saturating_add(1);
                    return Ok(TLExpr::Constant(a.max(b)));
                }
            }
            Ok(TLExpr::Max(Box::new(la), Box::new(ra)))
        }

        other => Err(other),
    }
}