Add an AMD IL backend about gpuocelot

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Assigned to rod

Original comment by [email protected] on 9 Oct 2009 at 1:53

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What exactly do you expect to do?
I mean I think you want to write a AMD IL backend for having AMD IL-> LLVM.
Would be possible to have AMD IL-> PTX or from PTX->AMD IL?
i.e. you have a way to do LLVM-> PTX or AMD IL->PTX?
Anyway seems that a LLVM->AMD IL is currently avaiable as part of AMD Stream 
2.0 SDK.. 
./llc -regalloc=amdil -filetype=asm -march=amdil kernel.bc -o kernel.il
see http://forums.amd.com/devforum/messageview.cfm?catid=390&threadid=120683&
enterthread=y for details
Also similary as Nvidia OpenCL backend (which uses not yet published PTX spec) 
AMD
OpenCL SDK is using a not yet published AMD IL spec (il_cs_2_0). If you want to 
add
for testing and regression the kernels form OpenCL kernel codes use my wrapper 
(as
currently it doesn't work on on AMD OpenCL the API for getting built device 
binaries)..
The wrapper also gets device assembly code (similar in concept to cubin as PTX 
is
similar to AMD IL in concept)..
see http://oscarbg.blogspot.com/2009/10/cal-wrapper-for-getting-amd-il-from.html

Original comment by [email protected] on 23 Oct 2009 at 6:29

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Actually the idea is to go from PTX to AMD IL so that we can execute 
pre-compiled
CUDA programs on AMD GPUs.

I was unaware that there was an LLVM to AMD IL backend available as part of the
Stream SDK. Thanks for the info.  We might be able to take advantage of our PTX 
to
LLVM translator, but I am doubtful because we loose a lot of information about 
the
thread hierarchy in PTX when we go to LLVM.

Right now rod is working on this so I will leave it open to him to elaborate.

Original comment by [email protected] on 24 Oct 2009 at 12:54

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Hi oscar,
I have a question regarding your calclwrapper library (from the link above)... 
It's
not working for me. Let me know if you read this post. Thank you.

Original comment by [email protected] on 11 Mar 2010 at 12:12

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Hi, I am new, can someone explain what exactly are you going to do in this 
issue?
I am wondering how do you get LLVM to generate code to run on AMD GPU? The AMD 
IL Bankend is not open source.

Original comment by [email protected] on 18 Apr 2011 at 8:43

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The AMD GPU backend translates PTX directly into IL. This paper describes the 
implementation details: http://doi.acm.org/10.1145/1964179.1964186. You can 
find documentation about the AMD IL at 
http://developer.amd.com/gpu/AMDAPPSDK/documentation.

Original comment by [email protected] on 18 Apr 2011 at 1:17

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Original comment by [email protected] on 23 Jun 2011 at 10:05

• Changed state: Started

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Just a FYI,
 AMD open sourced its backend in December. This might help with what you are attempting to do.
http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-December/046136.html

Original comment by villmow on 15 Mar 2012 at 5:37