If you look at AlphaISelDAGToDAG.cpp:244, it probably does what you
want. If a constant is too big, it spills it to the constant pool,
else it passes it through to the auto-generated selector.
Andrew
On 9/20/06, Rafael EspĂndola <rafael.espindola at gmail.com>
wrote:> In ARM, constants that are too large to be used as immediate are
> usually placed in a constant pool and loaded.
>
> What I am trying to do is to have a select function that checks the if
> a constant can be an immediate and, if it can't, produces a load:
>
>
---------------------------------------------------------------------------------------
> const Type *OpNTy = MVT::getTypeForValueType(MVT::i32);
> Constant *C = ConstantUInt::get(OpNTy, t);
> int alignment = 2;
> SDOperand Addr = CurDAG->getTargetConstantPool(C, MVT::i32,
alignment);
> Arg = CurDAG->getLoad(MVT::i32, CurDAG->getEntryNode(), Addr,
> CurDAG->getSrcValue(NULL));
>
----------------------------------------------------------------------------------------
>
> This fails with the assert "This target-independent node should have
> been selected". It is illegal to create a load during select?
>
> Should I write a lowering function to do this before the select phase?
>
> Thanks,
> Rafael
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>