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author | Vincent Ambo <mail@tazj.in> | 2022-12-29T11·44+0300 |
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committer | tazjin <tazjin@tvl.su> | 2022-12-29T12·27+0000 |
commit | 5d73c06b1a67bce68dcc0b2bd5f087ce00ab6317 (patch) | |
tree | 62d40c8ca8e1620bff028c8d89a5a0f05ee00661 /web/cgit-tvl | |
parent | 6ab8320f075e36f2328a86f5fcf7674844a0bd12 (diff) |
refactor(tvix/eval): use im::Vector for NixList representation r/5534
This is a persistent, structurally sharing data structure which is more efficient in some of our use-cases. I have verified the efficiency improvement using `hyperfine` repeatedly over expressions on nixpkgs. Lists are not the most performance-critical structure in Nix (that would be attribute sets), but we can already see a small (~5-10%) improvement. Note that there are a handful of cases where we still go via `Vec` that need to be fixed, most notable for `builtins.sort` which can not currently be implemented directly using `im::Vector` because of a restrictive type bound. Change-Id: I237cc50cbd7629a046e5a5e4601fbb40355e551d Reviewed-on: https://cl.tvl.fyi/c/depot/+/7670 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
Diffstat (limited to 'web/cgit-tvl')
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