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Hi Gus, When you say "n byte destination" you mean you want to encode an n byte address as a constant within the instruction? That would mean you couldn't encode an address that comes from a register. ~Craig On Tue, Mar 20, 2018 at 9:48 AM, Gus Smith via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Hi all. > > tl;dr: I would like to add a long x86 instruction

Hi all. tl;dr: I would like to add a long x86 instruction which doesn't conform to any existing format that I know; I'm not sure where to start. I am attempting to add an instruction into X86, to be simulated in gem5. I've already added a simple, opcode-only instruction which I can successfully decode and run in gem5, so I am roughly familiar with .td files and how backends are built

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