[PATCH] D92679: [RISCV] Add a pass to remove duplicate VSETVLI instructions in a basic block.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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Add simple pass for removing redundant vsetvli instructions within a basic block. This handles the case where the AVL register and VTYPE immediate are the same and no other instructions that change VTYPE or VL are between them.

There are going to be more opportunities for improvement in this space as we development more complex tests.


https://reviews.llvm.org/D92679

Files:
  llvm/lib/Target/RISCV/CMakeLists.txt
  llvm/lib/Target/RISCV/RISCV.h
  llvm/lib/Target/RISCV/RISCVCleanupVSETVLI.cpp
  llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
  llvm/test/CodeGen/RISCV/rvv/add-vsetvli-gpr.mir
  llvm/test/CodeGen/RISCV/rvv/load-add-store-16.ll
  llvm/test/CodeGen/RISCV/rvv/load-add-store-32.ll
  llvm/test/CodeGen/RISCV/rvv/load-add-store-64.ll
  llvm/test/CodeGen/RISCV/rvv/load-add-store-8.ll

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