CODEWITHSUNDEEP
cuda
Tyson Hilmer
Tyson Hilmer

Reputation: 771

How to find the CUDA __device__ definition of a function?

I have a specific function I am trying to find the source definition for, specifically what the nvcc compiler is using. This question is phrased to apply to any function (or symbol I suppose), which is used in a __device__ function. Given:

__device__ void Foo(){
  
  int x = round( 0.0f );
}

What is the standard/canonical/recommended way to find the definition for "round( float )" used by the nvcc compiler to generate device code?

Normally I use Visual Studio's F1 "Go to Definition", or search for "round" in project files, etc. I also search the CUDA Toolkit documentation and CUDA MATH API. In this case, I find the VS cmath definition. But how do I determine which definition the nvcc compiler uses?

Upvotes: 1

Views: 173

Answers (1)

talonmies
talonmies

Reputation: 72348

What is the standard/canonical/recommended way to find the definition for "round( float )" used by the nvcc compiler to generate device code?

Disassembly. Most inbuilt functions exist as stubs in headers that are expanded into inline assembly sequences as part of a device compiler code generating pass. There is no input code to view.

Upvotes: 2

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