[llvm-dev] [OpenCL] Question about pre-linking passes required to build OpenCL program

Liu, Yaxun (Sam) via llvm-dev
Tue, 10 May 2016 21:17:05 -0000

To: Anastasia Stulova <Anastasia.Stulova at arm.com>; Liu, Yaxun (Sam)
<Yaxun.Liu at amd.com>; cfe-dev (cfe-dev at lists.llvm.org) <cfe-dev at
lists.llvm.org>; Pan, Xiuli <xiuli.pan at intel.com>; Bader, Alexey
(alexey.bader at intel.com) <alexey.bader at intel.com>
Cc: Stellard, Thomas <Tom.Stellard at amd.com>; Mekhanoshin, Stanislav
<Stanislav.Mekhanoshin at amd.com>; nd <nd at arm.com>
Subject: RE: [OpenCL] Question about pre-linking passes required to build OpenCL
program

Hi Anastasia,

I'm glad to hear there could be some support for such a mechanism.  On our
side, we use such pre-link passes to interface with the specifics of our
built-in function library.  For example, we transform printf calls into a form
that interacts with our library.  We also transform calls to pipe functions,
kernel enqueue related functions, and transform calls to the atomic functions to
corresponding LLVM atomic instructions (and keep track of the memory scope
elsewhere currently).  You may have noticed that we have a proposal out to
enable the atomic instructions to directly carry a memory scope.

Thanks,
Brian

From: Anastasia Stulova [mailto:Anastasia.Stulova at arm.com]
Sent: Tuesday, May 10, 2016 11:45 AM
To: Liu, Yaxun (Sam); cfe-dev (cfe-dev at lists.llvm.org<mailto:cfe-dev at
lists.llvm.org>); Pan, Xiuli; Bader, Alexey (alexey.bader at
intel.com<mailto:alexey.bader at intel.com>)
Cc: Stellard, Thomas; Sumner, Brian; Mekhanoshin, Stanislav; nd
Subject: RE: [OpenCL] Question about pre-linking passes required to build OpenCL
program

Hi Sam,

It seems to be generally useful to the community. Could you give some examples
of those transformations that can be shared?

Also I am guessing this will be a part of LLVM code base. Do you intend it to be
publically available on the master branch?  If yes, perhaps llvm-dev should be
added to the discussion too.

Cheers,
Anastasia

From: Liu, Yaxun (Sam) [mailto:Yaxun.Liu at amd.com]
Sent: 09 May 2016 21:14
To: cfe-dev (cfe-dev at lists.llvm.org<mailto:cfe-dev at lists.llvm.org>);
Anastasia Stulova; Pan, Xiuli; Bader, Alexey (alexey.bader at
intel.com<mailto:alexey.bader at intel.com>)
Cc: Stellard, Thomas; Sumner, Brian; Mekhanoshin, Stanislav
Subject: [OpenCL] Question about pre-linking passes required to build OpenCL
program

Hi,

We typically need to apply some transformations to the IR between clang and the
standard linker. I am wondering if other OpenCL platforms require the same as
well?

I'm wondering if we all need such transformations (likely target specific).
Is there any way to collaborate on a common infrastructure for pre-linking
transformation that would reduce the size of the additions we have to make?

Thanks.

Sam
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