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perf(verifier): reconcile DEEP point-invariant hoist + factoring + fusion; drop verifier divu #839

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perf(verifier): reconcile DEEP point-invariant hoist + factoring + fusion; drop verifier divu #839

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perf(verifier): reconcile DEEP point-invariant hoist with inv-den fac…
diegokingston Jul 16, 2026
bc0bc9a
perf(verifier): replace power-of-two blowup divisions with shifts
diegokingston Jul 16, 2026
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5 changes: 4 additions & 1 deletion crypto/stark/src/fri/terminal.rs
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Expand Up @@ -143,7 +143,10 @@ where
);

let poly = Polynomial::new(coeffs);
let blowup = codeword_len / coeffs.len();
// codeword_len and coeffs.len() are both powers of two (asserted above), so
// the blowup ratio is a shift by the difference of their trailing-zero counts
// — avoids a runtime-divisor `divu` on the verifier/recursion path.
let blowup = 1usize << (codeword_len.trailing_zeros() - coeffs.len().trailing_zeros());

// Step 1: coset FFT to get natural-order evaluations.
let mut natural =
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