Optimizing compilers reload vector constants needlessly

1. compiler-explorer

   1 218 17,948 9.9 TypeScript

   Run compilers interactively from your web browser and interact with the assembly

   

   It should be part of these discussions to proof what you claim. Always. With code samples, directly to the compiler and corresponding assembler.

   https://godbolt.org/

   Statistics are worthless alone, at the end all that counts is the arena of performance and what the code becomes and how it runs against the handcrafted version.

2. JetBrains

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   Tell us how you use coding tools. You may win a prize! Are you a developer or a data analyst? Share your thoughts about your coding tools in our short survey and get a chance to win prizes!

   

3. OpenBLAS

   2 24 6,958 9.7 C

   OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.

   

4. std-simd

   3 9 617 1.1 C++

   std::experimental::simd for GCC [ISO/IEC TS 19570:2018]

   

   Bad news. For SIMD there are not cross-platform intrinsics. Intel intrinsics map directly to SSE/AVX instructions and ARM intrinsics map directly to NEON instructions.

   For cross-platform, your best bet is probably https://github.com/VcDevel/std-simd

   There's https://eigen.tuxfamily.org/index.php?title=Main_Page But, it's tremendously complicated for anything other than large-scale linear algebra.

   And, there's https://github.com/microsoft/DirectXMath But, it has obvious biases :P

5. DirectXMath

   4 16 1,700 7.7 C++

   DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps

   

   Bad news. For SIMD there are not cross-platform intrinsics. Intel intrinsics map directly to SSE/AVX instructions and ARM intrinsics map directly to NEON instructions.

   For cross-platform, your best bet is probably https://github.com/VcDevel/std-simd

   There's https://eigen.tuxfamily.org/index.php?title=Main_Page But, it's tremendously complicated for anything other than large-scale linear algebra.

   And, there's https://github.com/microsoft/DirectXMath But, it has obvious biases :P

6. FFmpeg

   5 505 52,736 10.0 C

   Mirror of https://git.ffmpeg.org/ffmpeg.git

   

7. highway

   6 79 4,983 9.6 C++

   Performance-portable, length-agnostic SIMD with runtime dispatch

   

   __builtin_shufflevector requires a known vector length, and can be pessimized (fusing two into one general all-to-all permute which is more expensive than two simple shuffles).

   Also, vqsort (https://github.com/google/highway/tree/master/hwy/contrib/so...) almost entirely consists of

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