llvm dev - Dec 2011 - [LLVMdev] AMD IL Code Generator Backend for OpenCL

I am proud to announce that AMD is Open Sourcing AMDIL Code Generator for LLVM
2.9.  While this version is not for uptake into LLVM mainline, it does build and
is compatible with LLVM 2.9.
This is the first step of the process, so I know there will be issues that show
up. In the next few months, we will be providing more unit tests and an LLVM 3.0
compatible version, and finally a TOT version for inclusion into the tree. I
look forward to any constructive feedback and will as answer any questions that
I can.


For information on the sections of an AMD OpenCL  binary, please refer here:
http://developer.amd.com/support/KnowledgeBase/Lists/KnowledgeBase/DispForm.aspx?ID=115

The attached zip file provides the code generator, a patch to LLVM 2.9 that adds
the target triple, and a few tests. Again this version is not for submission
into the tree, but for people to experiment, examine and provide feedback
outside of AMD.

Here are a list of the major known issues:
LLVM-IR that isn't generated from AMD's OpenCL frontend does not produce
any AMDIL.
Testing is sparse(I'm working on it)
No support for most OpenCL math functions. It is up to the library writers to
map from OpenCL function calls to AMDIL intrinsic.
Minor post processing of AMDIL is required for AMDIL source to be accepted by
calclCompile/clBuildProgramFromBinary.
The source is the documentation.
Only supports compute shader generation.
The output of the code generator is currently compatible with OpenCL 1.0/1.1
only when processing LLVM-IR from OpenCL binaries generated by AMD APP SDK 2.5
or later with the clBuildProgramSource options "-fbin-llvmir -fno-bin-amdil
-fno-bin-exe".

Enjoy,
Micah Villmow
OpenCL GPU Compiler Engineer
AMD Inc.


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For future reference, the zip file can also be downloaded from here:

http://people.freedesktop.org/~tstellar/AMDIL_code_generator.zip


From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Villmow, Micah
Sent: Monday, December 12, 2011 8:09 AM
To: LLVM Developers Mailing List
Subject: [LLVMdev] AMD IL Code Generator Backend for OpenCL

I am proud to announce that AMD is Open Sourcing AMDIL Code Generator for LLVM
2.9.  While this version is not for uptake into LLVM mainline, it does build and
is compatible with LLVM 2.9.
This is the first step of the process, so I know there will be issues that show
up. In the next few months, we will be providing more unit tests and an LLVM 3.0
compatible version, and finally a TOT version for inclusion into the tree. I
look forward to any constructive feedback and will as answer any questions that
I can.


For information on the sections of an AMD OpenCL  binary, please refer here:
http://developer.amd.com/support/KnowledgeBase/Lists/KnowledgeBase/DispForm.aspx?ID=115

The attached zip file provides the code generator, a patch to LLVM 2.9 that adds
the target triple, and a few tests. Again this version is not for submission
into the tree, but for people to experiment, examine and provide feedback
outside of AMD.

Here are a list of the major known issues:
LLVM-IR that isn't generated from AMD's OpenCL frontend does not produce
any AMDIL.
Testing is sparse(I'm working on it)
No support for most OpenCL math functions. It is up to the library writers to
map from OpenCL function calls to AMDIL intrinsic.
Minor post processing of AMDIL is required for AMDIL source to be accepted by
calclCompile/clBuildProgramFromBinary.
The source is the documentation.
Only supports compute shader generation.
The output of the code generator is currently compatible with OpenCL 1.0/1.1
only when processing LLVM-IR from OpenCL binaries generated by AMD APP SDK 2.5
or later with the clBuildProgramSource options "-fbin-llvmir -fno-bin-amdil
-fno-bin-exe".

Enjoy,
Micah Villmow
OpenCL GPU Compiler Engineer
AMD Inc.


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On Dec 12, 2011, at 9:09 AM, Villmow, Micah wrote:


LLVM-IR that isn’t generated from AMD’s OpenCL frontend does not produce any
AMDIL.

Is this because of the way metadata is handled?  If so, will that technique be
documented?  Or can it be reasonably inferred from the source code?

Thanks,

Marcus

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We are working on getting the documentation cleaned up to the point where it can
be released.
If you look at the test cases, you can infer what needs to be done. Basically
since this is targeted
for OpenCL, we annotate OpenCL kernels slightly different than normal functions
and that is
what causes the code to be generated. That being said, on my list of things to
do is fix this so that
any function will be generated correctly and also create calling conventions
that differentiate
between kernels and non-kernels.

Micah

From: Daniels, Marcus G [mailto:mdaniels at lanl.gov]
Sent: Tuesday, December 13, 2011 7:19 AM
To: Villmow, Micah
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] AMD IL Code Generator Backend for OpenCL


On Dec 12, 2011, at 9:09 AM, Villmow, Micah wrote:



LLVM-IR that isn't generated from AMD's OpenCL frontend does not produce
any AMDIL.

Is this because of the way metadata is handled?  If so, will that technique be
documented?  Or can it be reasonably inferred from the source code?

Thanks,

Marcus

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