[LLVMdev] Best way to generate Pseudo-Registers in target language?

Roel Jordans r.jordans at tue.nl
Mon Sep 17 04:10:15 PDT 2012

It sounds like you want the effects of the -reg2mem pass


- Roel

On 15/09/12 18:00, ryan baird wrote:
> I'm working on a target for the intermediate language of another
> compiler, and the other compiler does it's own register allocation.  In
> the other imediate language, the pseudo-registers are not live across
> basic blocks; Anything value that is live accross basic blocks should be
> put on the stack frame, and when the other compiler's register
> allocation occurs it will be taken back out of the stack frame.
> In case it helps answer my question, the code I'm working on is a
> modified copy of the MIPS target, because it looked like it would be
> easier to modify the MIPS target than to start from scratch.  Right now
> the project is being developed on LLVM 3.1.
> So here's the question. From the looks of it, I need to write a pass
> that looks through the basic blocks, finds any registers that get
> written, checks if they get used in other blocks (before being written
> to again), and if so, inserts the necessary loads and stores.  Is there
> a better way to do this?  If not, what would be the best place do this pass?
> Thanks,
> Ryan

More information about the llvm-dev mailing list