llvm dev - Apr 2015 - [LLVMdev] How to declare intrinsic that takes pointer to routine?

Suppose I want to define an intrinsic that takes a pointer to a routine.  E.g.,
an intrinsic version of qsort, or for argument's sake, an intrinsic form for
this hypothetical routine:

       void* foobitize(void thunk(void*,void*));

How do I defined the intrinsic in llvm/IR/Intrinsics.td ?  It looks like I need
to define a new class, but I'm lost about what I need to do.  There
doesn't seem to be any prior examples of intrinsics that take pointers to
routines.

This not something I'm planning to submit as a commit; it's just part of
an experiment.

- Arch D. Robison

On Thu, Apr 30, 2015 at 5:19 PM, Robison, Arch <arch.robison at intel.com>
wrote:
> Suppose I want to define an intrinsic that takes a pointer to a routine.
> E.g., an intrinsic version of qsort, or for argument's sake, an
intrinsic
> form for this hypothetical routine:
>
>        void* foobitize(void thunk(void*,void*));
>
> How do I defined the intrinsic in llvm/IR/Intrinsics.td ?  It looks like I
> need to define a new class, but I'm lost about what I need to do. 
There
> doesn't seem to be any prior examples of intrinsics that take pointers
to
> routines.
>
> This not something I'm planning to submit as a commit; it's just
part of
> an experiment.
>
I think there are some intrinsics which just take llvm_ptr_ty and require
their callers to bitcast to i8*.

>
> - Arch D. Robison
>
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