[LLVMdev] Pointer argument type in SparcISelLowering.cpp

[Christoph Erhardt]

Hi Raghu,

> I am working with the "LowerCall" function, and trying to figure out the types of all the "Outs" arguments. Specifically, I want to find out if a particular "Out[i]" argument is a pointer (of any type), or a regular data type. So far, all pointers show up as the "MVT::i32" datatype, which is not helping my cause. Is there a way to distinguish between pointers and regular MVT::i32 typed arguments in LowerCall?
last time I checked (that was with LLVM 2.7), there was no direct way to
retrieve this information. All the backend sees are MVT::i32 values.

That's a pity because there is more than one case where you really need
to know if a value is a pointer or a regular integer. For example, some
CPU architectures such as the Infineon TriCore have disjoint sets of
registers for addresses and data.

It would be possible to add a flag "isPointer" to the EVT class and
modify SelectionDAGBuilder and a few other classes to generate and
propagate this flag during the DAG creation process. In practice, this
unfortunately requires some not-so-clean hacks in select places. It
works for me, but it's probably not the way to go if you want to do
things the right way.

Best regards
Christoph