[PATCH] D75873: [mlir][RFC][AVX512] Start a primitive AVX512 dialect

[Nicolas Vasilache via Phabricator via llvm-commits]

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Fix copyright.


The Vector Dialect document <https://mlir.llvm.org/docs/Dialects/Vector/> discusses the vector abstractions that MLIR supports and the various tradeoffs involved.

One of the layer that is missing in OSS atm is the Hardware Vector Ops (HWV) level.

This revision AVX512-specific dialect for the specific purpose of implementing portions of XNNPack in MLIR and benchmarking them.

I am proposing to add a new Dialect/Targets/AVX512 Dialect that would directly target AVX512-specific intrinsics.

Atm, we rely too much on LLVM’s peephole optimizer to do a good job from small insertelement/extractelement/shufflevector. In the future, when possible, generic abstractions such as VP intrinsics should be preferred.

The revision will allow trading off HW-specific vs generic abstractions in MLIR.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75873

Files:
  mlir/include/mlir/Conversion/AVX512ToLLVM/ConvertAVX512ToLLVM.h
  mlir/include/mlir/Dialect/AVX512/AVX512Dialect.h
  mlir/include/mlir/Dialect/AVX512/AVX512Ops.td
  mlir/lib/Conversion/AVX512ToLLVM/ConvertAVX512ToLLVM.cpp
  mlir/lib/Dialect/AVX512/IR/AVX512Dialect.cpp
  mlir/lib/Target/LLVMIR/AVX512Intr.cpp
  mlir/test/Conversion/AVX512ToLLVM/convert-to-llvm.mlir
  mlir/test/Dialect/AVX512/roundtrip.mlir
  mlir/test/Target/avx512.mlir

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