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...ory operands (in the sense that X86II::getMemoryOperandNo >=0), but doesn't have MachineMemOperands? I'm seeing an example in the case of __builtin_prefetch (lowered via SelectionDAG::getMemIntrinsicNode, which produces a MachineMemOperand) vs __builtin_ia32_gatherpfdpd, lowered through getPrefetchNode in X86ISelLowering.cpp. The latter doesn't have a MachineMemOperand. Is the latter technically a bug, maybe, and it so happens nothing is hindered by the absence of the MachineMemOperand, so we're not observing it? Added Elena, based on commit log in X86ISelLowering.cpp, perhaps she has m...

Hello Mircea, > On 8 Mar 2018, at 18:52, Mircea Trofin via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Hello, > > I'm trying to understand the relationship between MachineMemOperand and, on X86, memory operands of machine instructions. The latter seem to be operands held in order by the MachineInstr, from an offset onwards - Base, Scale, Index, Displacement,

Hello, I'm trying to understand the relationship between MachineMemOperand and, on X86, memory operands of machine instructions. The latter seem to be operands held in order by the MachineInstr, from an offset onwards - Base, Scale, Index, Displacement, Segment. The former, if I understand it correctly, is used to hold a relationship back to IR load/store instructions. Is it possible to have