miden_processor/trace/chiplets/ace/
mod.rs

1use alloc::collections::BTreeMap;
2
3use miden_air::trace::{RowIndex, chiplets::ace::ACE_CHIPLET_NUM_COLS};
4use miden_core::{Felt, field::PrimeCharacteristicRing};
5
6use crate::trace::ChipletTraceFragment;
7
8mod trace;
9pub use trace::CircuitEvaluation;
10
11mod instruction;
12#[cfg(test)]
13mod tests;
14
15pub const PTR_OFFSET_ELEM: Felt = Felt::ONE;
16pub const PTR_OFFSET_WORD: Felt = Felt::new_unchecked(4);
17pub const MAX_NUM_ACE_WIRES: u32 = instruction::MAX_ID;
18
19/// Arithmetic circuit evaluation (ACE) chiplet.
20///
21/// This is a VM chiplet used to evaluate arithmetic circuits given some input, which is equivalent
22/// to evaluating some multi-variate polynomial at a tuple representing the input.
23///
24/// During the course of the VM execution, we keep track of all calls to the ACE chiplet in an
25/// [`CircuitEvaluation`] per call. This is then used to generate the full trace of the ACE chiplet.
26#[derive(Debug, Default)]
27pub struct Ace {
28    circuit_evaluations: BTreeMap<RowIndex, CircuitEvaluation>,
29}
30
31impl Ace {
32    /// Gets the total trace length of the ACE chiplet.
33    pub(crate) fn trace_len(&self) -> usize {
34        self.circuit_evaluations.values().map(CircuitEvaluation::num_rows).sum()
35    }
36
37    /// Fills the portion of the main trace allocated to the ACE chiplet.
38    pub(crate) fn fill_trace(self, trace: &mut ChipletTraceFragment) {
39        // make sure fragment dimensions are consistent with the dimensions of this trace
40        debug_assert_eq!(self.trace_len(), trace.len(), "inconsistent trace lengths");
41        debug_assert_eq!(ACE_CHIPLET_NUM_COLS, trace.width(), "inconsistent trace widths");
42
43        // Row-major scratch: `ACE_CHIPLET_NUM_COLS` contiguous cells per row.
44        let mut gen_trace = Felt::zero_vec(self.trace_len() * ACE_CHIPLET_NUM_COLS);
45
46        let mut offset = 0;
47        for eval_ctx in self.circuit_evaluations.into_values() {
48            eval_ctx.fill(offset, &mut gen_trace);
49            offset += eval_ctx.num_rows();
50        }
51
52        trace.copy_rows_from(&gen_trace);
53    }
54
55    /// Adds an entry resulting from a call to the ACE chiplet.
56    pub(crate) fn add_circuit_evaluation(
57        &mut self,
58        clk: RowIndex,
59        circuit_eval: CircuitEvaluation,
60    ) {
61        self.circuit_evaluations.insert(clk, circuit_eval);
62    }
63}
miden_processor/trace/chiplets/ace/mod.rs

miden_processor/trace/chiplets/ace/
mod.rs
