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Optimize small lists

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The value pointers of lists with 1 or 2 elements are now stored in the
list value itself. In particular, this makes the "concatMap (x: if
cond then [(f x)] else [])" idiom cheaper.
This commit is contained in:
Eelco Dolstra 2015-07-23 22:05:09 +02:00
parent 14be783676
commit b83801f8b3
11 changed files with 157 additions and 121 deletions
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4
src/libexpr/eval-inline.hh
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@ -66,7 +66,7 @@ inline void EvalState::forceAttrs(Value & v, const Pos & pos)
inline void EvalState::forceList(Value & v)
{
forceValue(v);
if (v.type != tList)
if (!v.isList())
throwTypeError("value is %1% while a list was expected", v);
}
@ -74,7 +74,7 @@ inline void EvalState::forceList(Value & v)
inline void EvalState::forceList(Value & v, const Pos & pos)
{
forceValue(v);
if (v.type != tList)
if (!v.isList())
throwTypeError("value is %1% while a list was expected, at %2%", v, pos);
}