66b481556e
`MCInstrDesc` counts the SWZ operand for `NumOperands` -- thus, since we do not parse this into the `MCInst` operands, there will be a mismatch between `MCInst.getNumOperands` and `MCInstrDesc.getNumOperands` . `llvm-mca` assumes that each operand counted by `MCInstrDesc.getNumOperands` will be present in `MCInst.operands`263377a175/llvm/lib/MCA/InstrBuilder.cpp (L324)This parses a dummy operand for the buffer_loads as a placeholder for the implicit SWZ operand. This is similar to the parsing of `tbuffer_` variants which automatically parse the dummy operand263377a175/llvm/utils/TableGen/AsmMatcherEmitter.cpp (L1853)