[LLVMdev] How to make correct pattern for instruction?

[Carlos Almeida Jr.]

Hi,

I'm a beginner user using LLVM, and I'm trying to create a new backend
using CPU0 Tutorial as reference.
I have two instructions for add: add and addi (this is a pseudo
instruction, but imediate operations is not available in architecture).
That is my idea: When the LLVM instruction selection find addi r3 = r2 +
value

must convert to this:

- load r1, value
- add r3 = r2 + r1

In archInstrInfo.td I declared the instructions of the architecture, but I
dont know how to "split" addi instruction. I tryed understand the LLVM and
CPU0 documentation for solve this but I not found anything. :(

Could anyone help me?

Thanks
Carlos
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