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Optimize empty sets

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This reduces the number of Bindings allocations by about 10%.
This commit is contained in:
Eelco Dolstra 2015-07-23 23:11:08 +02:00
parent 16c9935fa9
commit c8bb2371eb
3 changed files with 14 additions and 4 deletions
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10
src/libexpr/attr-set.cc
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@ -29,13 +29,17 @@ Bindings * EvalState::allocBindings(Bindings::size_t capacity)
}
void EvalState::mkAttrs(Value & v, unsigned int expected)
void EvalState::mkAttrs(Value & v, unsigned int capacity)
{
if (capacity == 0) {
v = vEmptySet;
return;
}
clearValue(v);
v.type = tAttrs;
v.attrs = allocBindings(expected);
v.attrs = allocBindings(capacity);
nrAttrsets++;
nrAttrsInAttrsets += expected;
nrAttrsInAttrsets += capacity;
}