[PATCH] D155690: [RISCV] Mask instructions in Zkt as constant-time

[Wang Pengcheng via Phabricator via llvm-commits]

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We use one bit in TSFlags to indicate that this instruction has
data-independent execution time property (constant-time) as required
in Zkt extension.

This property may help to verify whether a function is constant-time.

(Though there are limited usages currently, I think this will be
helpful to crypto libraries).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155690

Files:
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
  llvm/lib/Target/RISCV/RISCVInstrFormats.td
  llvm/lib/Target/RISCV/RISCVInstrFormatsC.td
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoC.td
  llvm/lib/Target/RISCV/RISCVInstrInfoM.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
  llvm/lib/Target/RISCV/RISCVInstrInfoZk.td
  llvm/test/MC/RISCV/rv32-constant-time.s
  llvm/test/MC/RISCV/rv64-constant-time.s

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