* lognot
@ 2019-07-31 3:16 Richard Stallman
2019-08-01 7:13 ` lognot Paul Eggert
0 siblings, 1 reply; 2+ messages in thread
From: Richard Stallman @ 2019-07-31 3:16 UTC (permalink / raw)
To: emacs-devel
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The doc string of lognot should explain what it does with large integers.
--
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: lognot
2019-07-31 3:16 lognot Richard Stallman
@ 2019-08-01 7:13 ` Paul Eggert
0 siblings, 0 replies; 2+ messages in thread
From: Paul Eggert @ 2019-08-01 7:13 UTC (permalink / raw)
To: rms; +Cc: emacs-devel
[-- Attachment #1: Type: text/plain, Size: 154 bytes --]
Richard Stallman wrote:
> The doc string of lognot should explain what it does with large integers.
I installed the attached patch to make that clearer.
[-- Attachment #2: 0001-Clarify-lognot-bignum.patch --]
[-- Type: text/x-patch, Size: 890 bytes --]
From 495d0667fcf4df9f10c261684162c64f08aadd71 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 31 Jul 2019 06:56:14 -0700
Subject: [PATCH] Clarify (lognot bignum)
* doc/lispref/numbers.texi (Bitwise Operations):
Say that (= (lognot n) (- -1 n)).
---
doc/lispref/numbers.texi | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/doc/lispref/numbers.texi b/doc/lispref/numbers.texi
index cae8babcb4..0c71387a8a 100644
--- a/doc/lispref/numbers.texi
+++ b/doc/lispref/numbers.texi
@@ -1072,7 +1072,8 @@ Bitwise Operations
@defun lognot integer
This function returns the bitwise complement of its argument: the @var{n}th
bit is one in the result if, and only if, the @var{n}th bit is zero in
-@var{integer}, and vice-versa.
+@var{integer}, and vice-versa. The result equals @minus{}1 @minus{}
+@var{integer}.
@example
(lognot 5)
--
2.17.1
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