[llvm-commits] Lowering of ISD::FRAME_TO_ARGS_OFFSET for Mips backend

[Akira Hatanaka]

Is it possible to do a custom-lowering like this

(add (FRAMEADDR 0), (FRAME_TO_ARGS_OFFSET)) => (add FrameObject, 0)

during legalization?

FrameObject is a fixed StackObject with offset 0 which points to the old
stack pointer.

I think this approach is simpler than expanding post-RA. It also takes care
of the case when other architectures (mips64 and mips16) are targeted.


On Tue, Oct 30, 2012 at 9:52 AM, Sasa Stankovic <Sasa.Stankovic at rt-rk.com>wrote:

> Hi all,
>
> The attached patch implements ISD::FRAME_TO_ARGS_OFFSET lowering for Mips
> backend (offset of the arguments area from the frame pointer). This is
> needed for intrinsic llvm.eh.dwarf.cfa, which is calculated as
>   ISD::FRAMEADDR + ISD::FRAME_TO_ARGS_OFFSET
>
> Regards,
> Sasa
>
>
>
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