[LLVMdev] Question about calling convention implementation in LLVM target

[Jim Grosbach]

In theory, the SPAdj (stack pointer adjustment) tracking in PEI could be used to support something like this. That’s not how it’s used right now and it might get more than a little interesting implementing that, though.

-Jim

On May 14, 2014, at 4:05 AM, Rodolphe Suescun <rsu.medal at dolphin.fr> wrote:

> Hi,
> 
> We are currently developing an LLVM target for a micro-controller,
> and would like our TargetLowering::LowerCall method to emit
> PUSH instructions (instead of STORE) to pass arguments (which
> would improve code density for function calls).
> 
> Is there a way of keeping track of the stack pointer changes
> implied by the PUSH instruction to calculate the correct
> offsets in RegisterInfo::eliminateFrameIndex when the call
> sequence is generated ?
> 
> Thanks a lot in advance,
> Rod
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