[llvm-dev] Obtain the execution time of one specified library function, such as CUDA library function.

[李阳 via llvm-dev]

Hi LLVM-ers,

I want to obtain the execution time of one specified library function, such
as CUDA library function.

My thoughts is: 1) use clang to compile the library function to IR;
                         2) instrument the IR, here is my unknown. I have
no idea about how to instrument the instruction relative to execution time.
Or is this approach feasible? If there is function supporting timestamp, I
want to insert the start-time timestamp to the begin of the library
function, and insert the stop-time timestamp to the end of the library
function, then compute the interval between two timestamp.

Thanks!
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