[PATCH] D135009: [RISCV] Refactor and improve eliminateFrameIndex.

[Craig Topper via Phabricator via llvm-commits]

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There are few changes mixed in here.

-Try to reuse the destination register from ADDI instead of always
creating a virtual register. This way we lean on the register
scavenger in fewer case.
-Explicitly reuse the primary virtual register when possible. There's
still a case where both getVLENFactoredAmount and handling large
fixed offsets can both create a secondary virtual register.
-Combine similar BuildMI calls by manipulating the Register variables.

There are still a couple early outs for ADDI, but overall I tried to
arrange the code into steps.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135009

Files:
  llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
  llvm/test/CodeGen/RISCV/rvv/addi-scalable-offset.mir
  llvm/test/CodeGen/RISCV/rvv/calling-conv-fastcc.ll
  llvm/test/CodeGen/RISCV/rvv/emergency-slot.mir
  llvm/test/CodeGen/RISCV/rvv/localvar.ll
  llvm/test/CodeGen/RISCV/rvv/rvv-out-arguments.ll

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