StaticTypeInfo
SpeciaLUT
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| StaticTypeInfo | SpeciaLUT | |
|---|---|---|
| 1 | 3 | |
| 65 | 26 | |
| - | - | |
| 0.0 | 3.4 | |
| about 2 years ago | 6 months ago | |
| CMake | C++ | |
| MIT License | BSD 2-clause "Simplified" License |
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StaticTypeInfo
SpeciaLUT
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C++ Show and Tell - December 2022
I made SpeciaLUT to convert bool/enum runtime tests to compile-time conditionals — by compiling all branching combinations in hot functions and saving them in a lookup-table, so the optimal one can be called at runtime. Reason: as an HPC consultant I encountered many codes that grew without good architecture, in which features would just be added and branching would propagate through all levels. This yields 10% to 50% performance increase in such codes.
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Runtime-constant propagation and branching optimization strategy
I have implemented this as a C++ library, where you extract const states as template parameters, and the library compiles all specializations and allows you to choose the optimal one at runtime.
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Runtime calling of a template specialisation using compile-time LUTs
So here's my C++20 implementation of the above: SpeciaLUT
What are some alternatives?
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compile-time-perf - Measures high-level timing and memory usage metrics during compilation
uninttp - A universal type for non-type template parameters for C++20 or later.
mlib - mlib is a fast, simple c++ meta-programming library that uses c++20.
relion - Image-processing software for cryo-electron microscopy
ctti - Compile Time Type Information for C++
introspective - Compile-Time Reflection in C++ for use with Scripting Languages
with-branching - An implementation of macroexpand-time conditionalization.
Vcpkg - C++ Library Manager for Windows, Linux, and MacOS
static_string - Experimental compile-time string manipulation C++17 library