[PATCH] D140542: [MachineCombiner] Support local strategy for traces

[Anton Sidorenko via Phabricator via llvm-commits]

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For in-order cores MachineCombiner makes better decisions when the critical path
is calculated only for the current basic block and does not take into account
other blocks from the trace.

This patch adds a virtual method to TargetInstrInfo to allow each target decide
which strategy to use.

Depends on D140541 <https://reviews.llvm.org/D140541>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140542

Files:
  llvm/include/llvm/CodeGen/TargetInstrInfo.h
  llvm/lib/CodeGen/MachineCombiner.cpp
  llvm/lib/CodeGen/TargetInstrInfo.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfo.h
  llvm/test/CodeGen/RISCV/machine-combiner.ll

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