Hi,
I wrote some more design docs answering these questions to
http://pocl.sourceforge.net/docs/html/design.html
(in the first two subsections).
On 08/10/2013 02:50 AM, Chuck Zhao wrote:
> 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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