[all-commits] [llvm/llvm-project] 6c189e: [AArch64] Add SME peephole optimizer pass (#104612)

[Sander de Smalen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c189eaea9941898e7379903d10274dbf6e2c545
      https://github.com/llvm/llvm-project/commit/6c189eaea9941898e7379903d10274dbf6e2c545
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2024-08-21 (Wed, 21 Aug 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64.h
    M llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
    M llvm/lib/Target/AArch64/CMakeLists.txt
    A llvm/lib/Target/AArch64/SMEPeepholeOpt.cpp
    M llvm/test/CodeGen/AArch64/O3-pipeline.ll
    M llvm/test/CodeGen/AArch64/sme-darwin-sve-vg.ll
    A llvm/test/CodeGen/AArch64/sme-peephole-opts.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-body.ll
    M llvm/test/CodeGen/AArch64/sme-streaming-interface.ll
    M llvm/test/CodeGen/AArch64/sme-toggle-pstateza.ll
    M llvm/test/CodeGen/AArch64/sme-vg-to-stack.ll
    M llvm/test/CodeGen/AArch64/streaming-compatible-memory-ops.ll

  Log Message:
  -----------
  [AArch64] Add SME peephole optimizer pass (#104612)

This pass removes back-to-back smstart/smstop instructions
to reduce the number of streaming mode changes in a function.

The implementation as proposed doesn't aim to solve all problems
yet and suggests a number of cases that can be optimized in the
future.



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