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Owen is correct in his descriptions. The MCOperand values are intended to model the instruction encoding. Where that doesn't match the assembly syntax, the asm parser (and codegen) and the instruction printer are responsible for encoding/decoding the values. For targets that predate the MC layer, this isn't always the case, leading to things being a bit confusing when just reading the

A question for LLVM code generator developers: After having read through "The LLVM Target-Independent Code Generator" [1] I'm unclear about what precisely the objects MCInst and MCOperand represent. They sit in the space between assembly syntax and binary encodings, but which are they modeling? For example, a Thumb 2 branch instruction 'b' takes an immediate. That syntax