GNU bug report logs - #32463
27.0.50; (logior -1) => 4611686018427387903

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Message #44 received at 32463 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Pip Cet <pipcet <at> gmail.com>, eliz <at> gnu.org
Cc: andrewjmoreton <at> gmail.com, 32463 <at> debbugs.gnu.org
Subject: Re: bug#32463: 27.0.50; (logior -1) => 4611686018427387903
Date: Sat, 18 Aug 2018 15:27:40 -0700

[Message part 1 (text/plain, inline)]

Pip Cet wrote:
> Are you suggesting we revert to
> the previous behavior, and try to come up with an interpretation for
> bignums that somehow extends the previous behavior?

I think Eli was suggesting reverting lsh to the traditional behavior for 
fixnums, for backwards-compatibility reasons.

There doesn't seem to be a good way to extend this behavior for bignums, so I 
installed the attached patch that simply makes it an error to invoke (lsh A B) 
where A is a negative bignum and B is negative. This patch also adds some test 
cases inspired by one of your previous emails (thanks).

[0001-Restore-traditional-lsh-behavior-on-fixnums.txt (text/plain, attachment)]

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