GNU bug report logs - #56641
Deprecate `lsh`

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mattias Engdegård <mattiase <at> acm.org>
Subject: bug#56641: closed (Re: bug#56641: Deprecate `lsh`)
Date: Sat, 23 Jul 2022 10:33:02 +0000

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Your bug report

#56641: Deprecate `lsh`

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 56641 <at> debbugs.gnu.org.

-- 
56641: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=56641
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Mattias Engdegård <mattiase <at> acm.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 56641-done <at> debbugs.gnu.org, Wilson Snyder <wsnyder <at> wsnyder.org>
Subject: Re: bug#56641: Deprecate `lsh`
Date: Sat, 23 Jul 2022 12:32:24 +0200

There is now a compiler warning about calls to `lsh`.

Although we usually defer changes in verilog-mode.el to the maintainer for keeping in sync with the upstream version, I made the necessary (trivial) adjustments to keep warnings away.

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From: Mattias Engdegård <mattiase <at> acm.org>
To: Emacs Bug Report <bug-gnu-emacs <at> gnu.org>
Subject: Deprecate `lsh`
Date: Tue, 19 Jul 2022 15:38:29 +0200

The function `lsh` works almost like `ash` but is much slower, cannot be constant-folded by the compiler, and above all has confusing semantics for historical reasons. Using `lsh` instead of `ash` is always a mistake.

For these reasons we should deprecate `lsh`. It is not important to remove it as soon as possible, but to dissuade people from accidentally using it in their code.

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