[Perf] Use SmallVec for additional temporary allocations #4
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ljedrz
commented
May 30, 2024
| /// Writes `self` into the given vector as a boolean array in little-endian order. | ||
| fn write_bits_le(&self, vec: &mut Vec<bool>); | ||
| fn write_bits_le<T: VecLike>(&self, vec: &mut T); | ||
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| /// Writes `self` into the given vector as a boolean array in big-endian order. | ||
| fn write_bits_be(&self, vec: &mut Vec<bool>); |
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note: this wasn't extended to write_bits_be, as those haven't been showing up in heap profiles, and the implementation of indexing that it would have to involve is a little bit tricky
Signed-off-by: ljedrz <[email protected]>
Signed-off-by: ljedrz <[email protected]>
Signed-off-by: ljedrz <[email protected]>
Signed-off-by: ljedrz <[email protected]>
Signed-off-by: ljedrz <[email protected]>
Signed-off-by: ljedrz <[email protected]>
Signed-off-by: ljedrz <[email protected]>
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This is a follow-up to #3 which includes the same approach, but in scenarios that require some additional setup.
The first commit introduces a new trait,
VecLike, which applies to bothVec<bool>andSmallVec<[bool; N]>, and allows us to use the latter inToBitsoperations that are currently restricted to the former.While the new trait is quite trivial, it does require a bit of boilerplate (the
Extend::extend,VecLike::extend_from_sliceetc.) for disambiguation. The upside is that together with the other linked PR, there are clear performance benefits to doing so:(measured in a
--devnode in 15-minute local runs from scratch)