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* Store lists as lists of pointers to values rather than as lists of

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values.  This improves sharing and gives another speed up.
  Evaluation of the NixOS system attribute is now almost 7 times
  faster than the old evaluator.
This commit is contained in:
Eelco Dolstra 2010-04-15 00:37:36 +00:00
parent e41b5828db
commit 04c4bd3624
7 changed files with 41 additions and 34 deletions
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4
src/libexpr/eval.hh
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@ -76,7 +76,7 @@ struct Value
Bindings * attrs;
struct {
unsigned int length;
Value * elems;
Value * * elems;
} list;
struct {
Env * env;
@ -282,8 +282,8 @@ private:
unsigned long nrEnvs;
unsigned long nrValuesInEnvs;
unsigned long nrValuesInLists;
unsigned long nrValues;
unsigned long nrListElems;
unsigned long nrEvaluated;
unsigned int recursionDepth;
unsigned int maxRecursionDepth;