nimsimd

nimble install nimsimd

This repo provides pleasant Nim bindings for various SIMD instructions.

Each SIMD instruction set is in its own file for importing.

x86

Instruction Set	Bindings
SSE	✅
SSE2	✅
SSE3	✅
SSSE3	✅
SSE4.1	✅
SSE4.2	✅
AVX	✅
AVX2	✅
PCLMULQDQ	✅
BMI1	✅
BMI2	✅
F16C	✅
MOVBE	✅
MOVBE	✅
POPCNT	✅
FMA	✅

Compiler flags

Some instruction sets require additional compiler flags to compile. I suggest putting any code that uses these instructions into its own .nim file and adding a localPassc pragma to the top of that file as needed, such as:

import nimsimd/sse42

when defined(gcc) or defined(clang):
  {.localPassc: "-msse4.2".}

...

Runtime check

You can also check if instruction sets are available at runtime:

import nimsimd/runtimecheck

echo checkInstructionSets({SSE41, PCLMULQDQ})

ARM

NEON bindings are started but experimental. Much to learn here about versioning and compilers.

Uses of nimsimd

• Pixie uses SIMD for faster 2D drawing.
• Crunchy uses SIMD for faster hashing and checksums.
• Noisy uses SIMD to accelerate generating coherent noise.

Testing

nimble test