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<mdspan>: Throughput improvements #4559

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Merged
StephanTLavavej merged 3 commits into from
Apr 9, 2024
Merged

<mdspan>: Throughput improvements #4559

StephanTLavavej merged 3 commits into from
Apr 9, 2024

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@JMazurkiewicz
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@JMazurkiewicz JMazurkiewicz commented Apr 3, 2024

  • Use conjunction_v instead of fold expressions
  • Drive-by: remove unnecessary lambda in test_mdspan_support.hpp

@JMazurkiewicz JMazurkiewicz requested a review from a team as a code owner April 3, 2024 14:09
@StephanTLavavej StephanTLavavej added throughput Must compile faster mdspan C++23 mdspan labels Apr 3, 2024
@StephanTLavavej StephanTLavavej self-assigned this Apr 3, 2024
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cpplearner commented Apr 3, 2024 •
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I fail to see how conjunction_v is better. It seems to cause more template instantiations in the happy path.

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StephanTLavavej commented Apr 3, 2024

MSVC has a throughput optimization that directly recognizes conjunction_v although I'm not sure how much of a difference the short-circuiting will make.

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StephanTLavavej reviewed Apr 3, 2024
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StephanTLavavej commented Apr 8, 2024

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

@StephanTLavavej StephanTLavavej merged commit 51b1a07 into microsoft:main Apr 9, 2024
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StephanTLavavej commented Apr 9, 2024

Thanks for looking out for ways to improve build throughput - it's like catnip for programmers! 🐈 🐈‍⬛ 😻

@JMazurkiewicz JMazurkiewicz deleted the mdspan/throughput branch April 10, 2024 08:17
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@StephanTLavavej StephanTLavavej StephanTLavavej approved these changes

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mdspan C++23 mdspan throughput Must compile faster

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