[llvm-dev] Using a stack slot as a destination register for cmov

[Craig Topper via llvm-dev]

You would need to make a MachineInstr that takes an address to store to as
input and has no def operands. The address will the stack slot you wish to
write. Have you already added a new version of CMOV to X86Instr*.td?

~Craig


On Mon, Mar 23, 2020 at 4:18 PM Genoveva Fossas via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello,
>
> I'm a computer science student experimenting with the X86 back end for
> llvm. I'm currently attempting to emit a cmov with the
> MachineInstructionBuilder, but I'm a little unclear on how I could emit a
> cmov that writes to a stack slot when its condition is true. I see several
> usages when there are virtual registers as the destination, but not one
> that writes to a stack slot. At least that I am able to discern.
>
> In summary: how would I emit a cmov with the machine instruction builder
> that writes to a stack slot when true?
>
> Thank you in advance,
> Genoveva Fossas
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> llvm-dev at lists.llvm.org
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