[llvm-dev] PSA: Parallel STL algorithms available in LLVM

[Hal Finkel via llvm-dev]

On 05/10/2017 10:36 PM, Zachary Turner via llvm-dev wrote:
> It's hard to say.  By definition it appears undefined (in the sense 
> that the TS literally does not define it), but on the other hand it is 
> a TS and this issue would (hopefully) come up and be specified before 
> it made it to standardization.

You mean the parallelism TS that was voted into C++17? ;)

Bryce, did they end up defining this?

  -Hal

>
> Supporting recursive parallel calls certainly seems like desirable 
> behavior, so from my point of view it would be nice to make sure it 
> works.  Not sure if others feel differently.
>
> On Wed, May 10, 2017 at 8:08 PM Scott Smith 
> <scott.smith at purestorage.com <mailto:scott.smith at purestorage.com>> wrote:
>
>     The spec doesn't seem to say anything about recursive calls to
>     parallel functions.  In my mind that means the functions must
>     support it, since it doesn't explicitly say it does not need to
>     support it.  Do you think that's accurate?
>
>     If so, I'll rely on that behavior in LLDB, and extend the
>     implementation in LLVM accordingly.
>
>     On Wed, May 10, 2017 at 5:37 PM, Zachary Turner via llvm-dev
>     <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>
>         Hi all,
>
>         This is just a PSA that as of r302752, 3 parallel algorithms
>         (for_each, for_each_n, and sort) are available in
>         llvm/Support/Parallel.h.
>
>         Effort was made to match the C++ Parallelism TS N4507
>         [http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4507.pdf]
>         as closely as possible, but some aspects were intentionally
>         omitted.
>
>         No support is added for the executor proposal N4406
>         [http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4406.pdf],
>         but I plan to try to work on this in the future, with no
>         specified timeline.
>
>
>
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>
>
>
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-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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