[llvm-dev] get ty2

Anastasiya Ruzhanskaya via llvm-dev llvm-dev at lists.llvm.org
Tue Jul 18 06:49:11 PDT 2017

Thank you for the answer, you helped a lot!

2017-07-18 15:38 GMT+02:00 Tim Northover <t.p.northover at gmail.com>:

> On 18 July 2017 at 03:09, Anastasiya Ruzhanskaya via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > in some operations there is a ty2 type, for example in truncate. What is
> the
> > most right way to get it ? I have seen some EVT types, but this is
> connected
> > to DAG... and I don't believe that there is no easy way to get ty2 with
> one
> > call function.
> For most operations you'll be looking at the type of the SDValue
> itself or one of its operands. This applies to trunc, where
> Op.getType() is the destination (small) type of the trunc and
> Op.getOperand(0).getType() is the source (big) type.
> The most common exception is sext_inreg nodes. They get created during
> legalization when it's realized that the source type doesn't have a
> valid register size; so both source and destination have the same type
> and there's a separate "this is the type you should extend from"
> operand. You'd access it with
> cast<VTSDnode>(Op.getOperand(1))->getVT().
> Cheers.
> Tim.
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