I was looking at how POCL handles OpenCL math functions, and got lost
half-way through.
Under {POCL_SRC}/lib/kernel, there are all sorts of implementations
(macro-intensive style :-) of OpenCL's math functions.
Each function is compiled to an LLVM bitcode file, and then linked
together into {POCL_OBJ}/lib/kernel/(platform)/kernel-(platform).bc file.
E.g., on my ARM platform, they are linked into
{POCL_OBJ}/lib/kernel/arm/kernel-armv7.bc.
And, from here, I am lost. I can't refer to where it is linked, and how
it is used.
E.g.
If I put in a call to rotate() or cross() inside example/example1.cl,
the code still works, with a call to rotate() generated.
However, it seems the example project only links with libpocl and libpoclu.
I unpacked both libpocl.a and libpoclu.a, neither has the compiled math
functions inside.
So, where/how does POCL link an app with the math functions defined
inside {POCL_SRC}/lib/kernel?
Is there a secretly packaged library somewhere that gets implicitly linked?
Seems the {POCL_SRC}/lib/kernel directory is kind of different comparing
with its neighbors which all compiles down to a lib file (.a and .so).
Some help to explain please.
1 more question:
- what is the difference between libpocl and libOpenCL. They seem to be
quite similar to each other, but a "diff" tells me they are not the same.
Why do we generate these 2 similar files?
A quick grep seems to show that libOpenCL is not used by any of the
examples.
Thank you
Chuck
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