[PATCH] D119921: [RISCV] Teach VSETVLInsert to optimize vsetvli for ScalarMoveInstr

[Chenbing.Zheng via Phabricator via llvm-commits]

Chenbing.Zheng created this revision.
Chenbing.Zheng added reviewers: craig.topper, frasercrmck, asb, jacquesguan, benshi001.
Chenbing.Zheng added a project: LLVM.
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VSETVLI from ScalarMove don't care LMUL and non-zero AVL.
So we can use next VSETVLI to instead previous VSETVLI form ScalarMove ,
 if  they only have  different LMUL or non-zero AVL.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119921

Files:
  llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-shuffles.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-mask-buildvec.ll

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