Comments (7)
That's a great trick! i'll benchmark it :-)
from frozen.
After some tests : the requirements on the size (power of two minus 1) makes it scarcely usefull, and the benfit is not huge, so i'd rather keep current generic version.
from frozen.
Making it generic shouldn't be too hard with a template dispatch of the std::bool_constant<is_power_of_two_minus_one(N)>
kind, but if the benefit is not that good, then it might indeed not be worth it. Too bad, it looked fun :/
from frozen.
Making it generic was indeed not an issue. I just did not report any sensible performance improvement :-/
from frozen.
For the record, compilers are getting smarter :
https://godbolt.org/g/zilVYU
from frozen.
For the record, I implemented a simple branchless version in #25. It still uses a conditional moves but it gives interesting speedup, especially on clang (gcc was already capable of figuring out the cmov
from frozen.
A branchless trail-recursive implementation? Now that's interesting :p
I'm always surprised by how much compilers are able to optimize away some things to the point that trying to find clever algorithms occasionally becomes pointless ^^'
from frozen.
Related Issues (20)
- Add conan package HOT 3
- frozen::unordered_map, fails in MSVC 2017 with C++17 HOT 3
- Hashing with Boost Hash Library HOT 2
- Nested containers with different sizes HOT 5
- frozen::unordered_multiset? HOT 1
- Compilation errors in VS 2019 HOT 7
- include/frozen/map.h:114:12: error: binding reference of type 'int' to value of type 'const int' drops 'const' qualifier HOT 2
- Error when compiling the examples in the released version 1.0.0 HOT 2
- Support for std::array? HOT 2
- Warning concerning a missing constexpr HOT 3
- [Windows][VS][MSVC] Compilation failed - min / max macros HOT 2
- Add map/set final() method? HOT 5
- Status of cvector and carray
- Building tests fail because of incompatible catch2 version. HOT 1
- How to create a string key at runtime? HOT 5
- Frozen bimap? HOT 2
- Frozen constexpr map AVL tree ?
- Test compilation error HOT 5
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from frozen.