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Subject: Re: [std-proposals] Rotate Bits Left or Right
From: Charles Milette (charlesmilette_at_[hidden])
Date: 2020-01-26 11:05:10


There is std::rotl and std::rotr as part of C++20 <bit>

On Sun, Jan 26, 2020, 12:03 Walt Karas via Std-Proposals <
std-proposals_at_[hidden]> wrote:

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> Relying on the optimizer seems a viable option:
> https://godbolt.org/z/jbJBv3
>
> ...
> Date: Sun, 26 Jan 2020 09:03:29 +0100
> From: "Kjetil Kristoffer Solberg" <post_at_[hidden]>
> To: <std-proposals_at_[hidden]>
> Subject: [std-proposals] Rotate Bits Left or Right
> Message-ID: <003701d5d41f$1a7ef420$4f7cdc60$@ikjetil.no>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi!
>
> Shouldn't there be a rotate bits left and rotate bits right operator? The
> way I have seen rotate done
>
> is pretty ugly. There are instructions in x86 and other instructions sets
> for rotation. Why not have it in the C++ standard?
>
>
>
> NB! I have not checked if this question have been asked a million times
> before.
>
>
>
> Regards
>
> Kjetil
> --
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>



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