[PATCH] D155654: [RISCV] Add SchedRead for Merge operands on MASK Pseudos

[Michael Maitland via Phabricator via llvm-commits]

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For Pseudos that end in _MASK, in the case that the instruction
should be mask undisturbed, the destination register must be read
to determine the undisturbed values. This patch adds a SchedRead
that gets passed to MASK pseudos to represent this extra read that
must occur.

A future patch should do something similiar for when a pseudo is TU,
since those instructions must also read their destination to preserve
undisturbed-ness.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155654

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoV.td
  llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
  llvm/lib/Target/RISCV/RISCVInstrInfoXTHead.td
  llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
  llvm/lib/Target/RISCV/RISCVScheduleV.td

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