Re: [PATCH v2 0/3] MR9926: ntdll: Make RtlEncodePointer / RtlDecodePointer compatible.

[Paul Gofman (＠gofman)]

On Mon Jan 19 22:44:47 2026 +0000, Alfred Agrell wrote:
> If count==0, bits-count = 64, and v<<64 is UB. (Or 32 on 32bit builds,
> but still UB.)
> Consider instead `return (v >> (count % bits)) | (v << ((bits - count) %
> bits));`. https://godbolt.org/z/9nWP6zK8P (Or stdc_rotate_right, except
> that one doesn't exist until C23.)
> Same for the rotate left function below, and the actual encode/decode
> pointer functions.
> Oh well. Not sure if we really never ever do that, but indeed, best to avoid that, thanks.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9926#note_127369