[llvm-dev] CUDA: get thread id in a pass

[Gurunath Kadam via llvm-dev]

Hi,

I am writing my first pass in LLVM.

I need to collect the threadId in each kernel call and then associate that
with the corresponding load/store calls.

I am stuck at extracting the threadId.

LLVM intrinsic for thread ID declaration:

threadId @llvm.nvvm.read.ptx.sreg.tid.*

Actual call:

; What is my ID?
  %id = tail call i32 @llvm.nvvm.read.ptx.sreg.tid.x() readnone nounwind


So in the above LLVM IR instruction *@llvm.nvvm.read.ptx.sreg.tid.** is the
operand 1, is that right? And then is *%id* operand 0?

So I need to check for an instruction with the operand type matching above
expression and then extract operand 0.

Is my understanding right?

Thank you.

Regards,
Gurunath
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