[llvm-dev] question: access IR class Instruction from DAG SDValue

Jonathan via llvm-dev llvm-dev at lists.llvm.org
Mon Nov 27 04:51:00 PST 2017

I am working on llvm gpu backend. The instruction metadata can only get in IR (class instruction). In DAG stage, the instructions are reordered, so I cannot map the metadata to correct instruction if I cannot access instruction from DAG or MachineInstr structure.

> On Nov 26, 2017, at 11:02 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:
> It might be a more useful to know what it is you need from the IR in the DAG or what it is you r trying to do?
> On Nov 25, 2017 7:59 PM, "Jonathan via llvm-dev" <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> The llvm backend uses class Instruction in IR handle stage, create SDVaule and DAG in DAG translation stage and class MachineInstr in Machine instruction translation stage.
> Can I access class Instruction from DAG structure or stage, or access DAG and Instruction from MachineInstr structure or stage?
> Jonathan
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