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Add builtin function "partition"

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The implementation of "partition" in Nixpkgs is O(n^2) (because of the
use of ++), and for some reason was causing stack overflows in
multi-threaded evaluation (not sure why).

This reduces "nix-env -qa --drv-path" runtime by 0.197s and memory
usage by 298 MiB (in non-Boehm mode).
This commit is contained in:
Eelco Dolstra 2016-08-29 17:28:20 +02:00
parent c0a7b84748
commit 26d92017d3
7 changed files with 54 additions and 10 deletions
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2
src/libexpr/eval.cc
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@ -293,6 +293,8 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
, sColumn(symbols.create("column"))
, sFunctor(symbols.create("__functor"))
, sToString(symbols.create("__toString"))
, sRight(symbols.create("right"))
, sWrong(symbols.create("wrong"))
, store(store)
, baseEnv(allocEnv(128))
, staticBaseEnv(false, 0)