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Skip the IR pre-capture on the riscv64 guest #949

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Skip the IR pre-capture on the riscv64 guest #949

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6 changes: 6 additions & 0 deletions prover/src/test_utils.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -671,6 +671,12 @@ fn build_air<CS: ConstraintSet<F, E> + Clone + Send + Sync + 'static>(
.with_name(name);
// Pre-capture the constraint IR so every clone carries it (the prover's
// GPU lowering and interpreter paths force it per instance otherwise).
//
// NOT on the guest: the in-VM verifier reaches `build_air` through
// `VmAirs::new` and never calls `constraint_program()`, so capturing here
// buys it nothing and costs a full IR build per AIR — measured as ~9.7% of
// the recursion guest's cycles on a real block.
#[cfg(not(target_arch = "riscv64"))]
let _ = air.constraint_program();
air_prototype_cache()
.lock()
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