coding spirit

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~~NOTRANS~~
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====== SIMD ======

Modern processors have capabilities for SIMD (single instruction multiple data) like SSE or AVX instruction sets on x64 or NEON on ARM architecture. Now, in 2022, C/C++ compilers still have problems at automatic vectorization to generate these vector instructions. Assembler or compiler intrinsic functions can be used to enforce the usage ..


===== CPU architectures/infos =====

  * https://en.wikichip.org/wiki/x86/extensions
  * https://en.wikichip.org/wiki/arm/versions
  * https://en.wikichip.org/wiki/arm_holdings#Microarchitectures
  * https://en.wikipedia.org/wiki/Raspberry_Pi#Specifications
    * https://en.wikipedia.org/wiki/Comparison_of_ARMv8-A_processors
    * does contain the L1/L2/L3 cache sizes
    * Raspberry Pi 4 has Broadcom Chip BCM2711


===== Libraries =====

  * https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html
  * https://github.com/VcDevel/Vc
  * https://github.com/hayguen/MIPP
    * it's origin https://github.com/aff3ct/MIPP
  * SSE/AVX to Neon
    * https://github.com/DLTcollab/sse2neon
    * https://github.com/kunpengcompute/AvxToNeon
  * Neon for x86/SSE
    * https://github.com/intel/ARM_NEON_2_x86_SSE
  * SIMD Everywhere
    * https://simd-everywhere.github.io/blog/
    * https://github.com/simd-everywhere/simde
    * https://github.com/jpcima/simde