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Tiny optimisation in the filter primop

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This commit is contained in:
Eelco Dolstra 2012-12-04 17:22:20 +01:00
parent 094a08f839
commit 3100b29fc5
1 changed files with 9 additions and 2 deletions
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11
src/libexpr/primops.cc
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@ -950,15 +950,22 @@ static void prim_filter(EvalState & state, Value * * args, Value & v)
Value * vs[args[1]->list.length];
unsigned int k = 0;
bool same = true;
for (unsigned int n = 0; n < args[1]->list.length; ++n) {
Value res;
state.callFunction(*args[0], *args[1]->list.elems[n], res);
if (state.forceBool(res))
vs[k++] = args[1]->list.elems[n];
else
same = false;
}
state.mkList(v, k);
for (unsigned int n = 0; n < k; ++n) v.list.elems[n] = vs[n];
if (same)
v = *args[1];
else {
state.mkList(v, k);
for (unsigned int n = 0; n < k; ++n) v.list.elems[n] = vs[n];
}
}