X86InstrInfo

Code Generation X86
1

Hello,

I am new to llvm and I am trying to discover a way to write and insert X86 instructions using llvm passes.
I was going through the different files, X86IbstrInfo being one of them, and I can see a listing of all the different instructions (X86::MOV16rr, X86::MOV16rm…) but I can’t find anywhere with the description of each of the instructions.
Does anyone have any resources or direct me somewhere from where to start?

Thank you in advance.

Salwa

2

These opcodes are generated from *.td files automatically. There’s no document for them in LLVM. But you can find the introductions of the corresponding instructions from SDM.
I think one easy way is you write the code in C/LLVM IR, and dump it before the pass you want to write, e.g., Compiler Explorer Line73~79

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