[cfe-dev] [Openmp-dev] RFC: Proposing an LLVM subproject for parallelism runtime and support libraries

Cownie, James H via cfe-dev cfe-dev at lists.llvm.org
Tue Mar 15 04:40:16 PDT 2016

OK, thanks.

-- Jim

James Cownie <james.h.cownie at intel.com>
SSG/DPD/TCAR (Technical Computing, Analyzers and Runtimes)
Tel: +44 117 9071438

From: Chandler Carruth [mailto:chandlerc at google.com]
Sent: Tuesday, March 15, 2016 11:28 AM
To: Cownie, James H <james.h.cownie at intel.com>; Jason Henline <jhen at google.com>; C Bergström <cbergstrom at pathscale.com>
Cc: llvm-dev <llvm-dev at lists.llvm.org>; cfe-dev <cfe-dev at lists.llvm.org>; openmp-dev at lists.llvm.org
Subject: Re: [cfe-dev] [Openmp-dev] RFC: Proposing an LLVM subproject for parallelism runtime and support libraries

On Tue, Mar 15, 2016 at 12:13 PM Cownie, James H <james.h.cownie at intel.com<mailto:james.h.cownie at intel.com>> wrote:

That raises a more meta-question for me, which is “Why should StreamExecutor be in LLVM at all?”

AFAICS, with you approach

•         It is not a runtime library whose interface the compiler needs to understand.
The original email pretty clearly spells out how it is specifically intended to be a target for the compiler?

•         It does not depend on any LLVM runtime libraries.

•         It is expected to be used with out-of-tree plugins.
Note that this doesn't mean there won't be in-tree plugins. It's analogous to how LLVM supports out-of-tree targets.

If I got all of that right, what connection does it have with LLVM that makes having it in the LLVM tree necessary, or an improvement over simply having it on github (or whatever your favourite open-source hosting location is)?
If there were nothing compiler related to it, then the argument would be much more tenuous. But I think there is a great deal of compiler relevance here.
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