Optimize BFV dot_product_scalar #370
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…sals Previously, `dot_product_scalar` cloned the input iterators multiple times (for counting, parameter validation, and part length validation) before finally iterating for computation. This added unnecessary overhead. This change collects the zipped input iterators into a `Vec<(&Ciphertext, &Plaintext)>` once. Validation and computation then iterate over this vector. This avoids redundant passes and iterator cloning. Performance benchmarks (`bfv_optimized_ops`) show mixed results due to allocation overhead for very fast operations, but significant improvements (up to 36%) for some medium-sized workloads (e.g., size=1000, degree=2048) and improved code clarity/safety by validating on the effective input set. Co-authored-by: tlepoint <1345502+tlepoint@users.noreply.github.com>
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| if inputs.iter().any(|(cti, pti)| { | ||
| cti.par != ct_first.par || pti.par != ct_first.par || cti.len() != ct_first.len() | ||
| }) { |
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This validation now only inspects ciphertexts that have a corresponding plaintext in inputs. If the ciphertext iterator is longer than the plaintext iterator, any extra ciphertexts are ignored by izip! and will no longer be checked for parameter/part-length consistency. That is a regression from the previous behavior (which walked all ciphertexts) and violates the function’s own contract (“ciphertexts have different number of parts”) for those trailing ciphertexts. The bug manifests when callers accidentally pass mismatched iterators (e.g., extra ciphertexts), because the function will silently accept ciphertexts with different part counts/params instead of erroring.
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Optimize BFV dot_product_scalar by removing redundant iterator traversals
Previously,
dot_product_scalarcloned the input iterators multiple times (for counting, parameter validation, and part length validation) before finally iterating for computation. This added unnecessary overhead.This change collects the zipped input iterators into a
Vec<(&Ciphertext, &Plaintext)>once. Validation and computation then iterate over this vector. This avoids redundant passes and iterator cloning.Performance benchmarks (
bfv_optimized_ops) show mixed results due to allocation overhead for very fast operations, but significant improvements (up to 36%) for some medium-sized workloads (e.g., size=1000, degree=2048) and improved code clarity/safety by validating on the effective input set.PR created automatically by Jules for task 4339254808930472403 started by @tlepoint