Optimizing compilers reload vector constants needlessly

• compiler-explorer

  190 15,138 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.

• OpenBLAS

  22 5,952 9.8 C

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

  

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• std-simd

  9 544 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

• DirectXMath

  13 1,481 6.8 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

• FFmpeg

  485 42,374 10.0 C

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

  

• highway

  66 3,645 9.8 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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