[LLVMdev] How to make correct pattern for instruction?

[Johnny Val]

Hi Carlos,

LLVM will do this automatically for you! There is no need for a pseudo
instruction in this case. As long as you have a way of adding two i32s (or
any other type) using registers then LLVM will automatically do what you
described when immediates are involved.

Cheers,

Johnny

On Wed, Nov 26, 2014 at 11:50 PM, Carlos Almeida Jr. <almeidajr at gmail.com>
wrote:

> 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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