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feat: passes copy_cycles by const reference to avoid copying #8051

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Aug 16, 2024
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feat: passes copy_cycles by const reference to avoid copying #8051

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4 changes: 2 additions & 2 deletions barretenberg/cpp/src/barretenberg/plonk_honk_shared/composer/permutation_lib.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,7 @@ template <typename Flavor, bool generalized>
PermutationMapping<Flavor::NUM_WIRES, generalized> compute_permutation_mapping(
const typename Flavor::CircuitBuilder& circuit_constructor,
typename Flavor::ProvingKey* proving_key,
std::vector<CyclicPermutation> wire_copy_cycles)
const std::vector<CyclicPermutation>& wire_copy_cycles)
{

// Initialize the table of permutations so that every element points to itself
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[Re: line +112]

 This should probably be a const auto& now (the compiler will infer it though)

See this comment inline on Graphite.

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[Re: line +118]

 Here you are making another copy. If you do

const cycle_node& next_cycle_node you can avoid it.

See this comment inline on Graphite.

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good catch, wonder if this was maybe a reason I was seeing slower timing

Expand Down Expand Up @@ -368,7 +368,7 @@ inline std::tuple<LegacyPolynomial<FF>, LegacyPolynomial<FF>> compute_first_and_
template <typename Flavor>
void compute_permutation_argument_polynomials(const typename Flavor::CircuitBuilder& circuit,
typename Flavor::ProvingKey* key,
std::vector<CyclicPermutation> copy_cycles)
const std::vector<CyclicPermutation>& copy_cycles)
{
constexpr bool generalized = IsUltraPlonkFlavor<Flavor> || IsUltraFlavor<Flavor>;
auto mapping = compute_permutation_mapping<Flavor, generalized>(circuit, key, copy_cycles);
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