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The instruction makes use of a previously ignored field in the fence instruction. It is introduced in the version 2.3 draft of the RISC-V specification after much work by the Memory Model Task Group. As clarified here <https://github.com/riscv/riscv-isa-manual/issues/186>, the fence.tso assembler mnemonic does not have operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334278 91177308-0d34-0410-b5e6-96231b3b80d8