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* intersectAttrs: optimise for the case where the second set is larger

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than the first set.  (That's usually the case with callPackage.)
This commit is contained in:
Eelco Dolstra 2010-08-02 11:54:44 +00:00
parent 532d766c27
commit 7af6a2fd71
1 changed files with 7 additions and 7 deletions
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14
src/libexpr/primops.cc
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@ -788,13 +788,13 @@ static void prim_intersectAttrs(EvalState & state, Value * * args, Value & v)
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
state.mkAttrs(v); state.mkAttrs(v);
foreach (Bindings::iterator, i, *args[1]->attrs) { foreach (Bindings::iterator, i, *args[0]->attrs) {
Bindings::iterator j = args[0]->attrs->find(i->first); Bindings::iterator j = args[1]->attrs->find(i->first);
if (j != args[0]->attrs->end()) { if (j != args[1]->attrs->end()) {
Attr & a = (*v.attrs)[i->first]; Attr & a = (*v.attrs)[j->first];
mkCopy(a.value, i->second.value); mkCopy(a.value, j->second.value);
a.pos = i->second.pos; a.pos = j->second.pos;
} }
} }
} }