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On 05/10/2017 10:36 PM, Zachary Turner via llvm-dev wrote:<br>
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<div dir="ltr">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.</div>
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You mean the parallelism TS that was voted into C++17? ;)<br>
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Bryce, did they end up defining this?<br>
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-Hal<br>
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<div>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.</div>
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<div dir="ltr">On Wed, May 10, 2017 at 8:08 PM Scott Smith <<a
moz-do-not-send="true"
href="mailto:scott.smith@purestorage.com">scott.smith@purestorage.com</a>>
wrote:<br>
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<div>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?<br>
<br>
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If so, I'll rely on that behavior in LLDB, and extend the
implementation in LLVM accordingly.<br>
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<div class="gmail_quote">On Wed, May 10, 2017 at 5:37 PM,
Zachary Turner via llvm-dev <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span>
wrote:<br>
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<div dir="ltr">Hi all,
<div><br>
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<div>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. </div>
<div><br>
</div>
<div>Effort was made to match the C++ Parallelism TS
N4507 [<a moz-do-not-send="true"
href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4507.pdf"
target="_blank">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4507.pdf</a>]
as closely as possible, but some aspects were
intentionally omitted.</div>
<div><br>
</div>
<div>No support is added for the executor proposal
N4406 [<a moz-do-not-send="true"
href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4406.pdf"
target="_blank">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4406.pdf</a>],
but I plan to try to work on this in the future,
with no specified timeline.</div>
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<pre wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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