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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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6
src/libexpr/value-to-xml.cc
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@ -119,10 +119,10 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
break;
case tList: {
case tList1: case tList2: case tListN: {
XMLOpenElement _(doc, "list");
for (unsigned int n = 0; n < v.list.length; ++n)
printValueAsXML(state, strict, location, *v.list.elems[n], doc, context, drvsSeen);
for (unsigned int n = 0; n < v.listSize(); ++n)
printValueAsXML(state, strict, location, *v.listElems()[n], doc, context, drvsSeen);
break;
}