[PATCH] D93019: [RISCV] Add support for 'pause' as an alias for 'fence w, 0'

[Michael Munday via Phabricator via llvm-commits]

mundaym created this revision.
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Do not merge:

1. the pause hint is still in the proposal stage (https://github.com/riscv/riscv-isa-manual/pull/398)
2. the syntax for representing empty sets in fence operands is not yet finalized (likely to be either 0, as in this patch, or -)

Add support for the 'pause' hint instruction as an alias for
'fence w, 0'. To do this allow the 'fence' operands pred and succ
to be set to 0 (the empty set). This will also allow future hints
to be encoded as 'fence 0, <x>' and 'fence <x>, 0'.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93019

Files:
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVInstPrinter.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/test/MC/RISCV/rv32i-invalid.s
  llvm/test/MC/RISCV/rv32i-valid.s
  llvm/test/MC/RISCV/rvi-aliases-valid.s

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