* Re: master 3843711 3/3: Simplify calculator-expt
[not found] ` <20191105074004.5063220A3C@vcs0.savannah.gnu.org>
@ 2019-11-05 11:28 ` Juanma Barranquero
2019-11-05 21:45 ` Paul Eggert
2019-11-05 19:29 ` Stefan Monnier
1 sibling, 1 reply; 6+ messages in thread
From: Juanma Barranquero @ 2019-11-05 11:28 UTC (permalink / raw)
To: Paul Eggert; +Cc: Emacs developers
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On Tue, Nov 5, 2019 at 8:40 AM Paul Eggert <eggert@cs.ucla.edu> wrote:
> + (overflow-error
> + (if (or (natnump x) (cl-evenp y))
> + 1.0e+INF
> + -1.0e+INF))))
That introduces a run-time dependency on cl-lib:
ELC calculator.elc
In end of data:
calculator.el:1644:1:Warning: the function `cl-evenp' might not be defined
at
runtime.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: master 3843711 3/3: Simplify calculator-expt
[not found] ` <20191105074004.5063220A3C@vcs0.savannah.gnu.org>
2019-11-05 11:28 ` master 3843711 3/3: Simplify calculator-expt Juanma Barranquero
@ 2019-11-05 19:29 ` Stefan Monnier
2019-11-05 21:47 ` Paul Eggert
1 sibling, 1 reply; 6+ messages in thread
From: Stefan Monnier @ 2019-11-05 19:29 UTC (permalink / raw)
To: Paul Eggert; +Cc: emacs-devel
> - ((eq (logand (truncate y) 1) 1) ; expansion of cl `oddp'
> [...]
> + (if (or (natnump x) (cl-evenp y))
`cl-evenp` doesn't do the `truncate` part, so this will signal an error if
`x` is not a natural number and `y` is not an integer.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: master 3843711 3/3: Simplify calculator-expt
2019-11-05 11:28 ` master 3843711 3/3: Simplify calculator-expt Juanma Barranquero
@ 2019-11-05 21:45 ` Paul Eggert
0 siblings, 0 replies; 6+ messages in thread
From: Paul Eggert @ 2019-11-05 21:45 UTC (permalink / raw)
To: Juanma Barranquero; +Cc: Emacs developers
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On 11/5/19 3:28 AM, Juanma Barranquero wrote:
> calculator.el:1644:1:Warning: the function `cl-evenp' might not be
> defined at runtime.
Thanks, I installed the attached to pacify the byte-compiler about that.
(Remind me again why cl-lib is not preloaded? :-)
[-- Attachment #2: 0001-Pacify-byte-compiler-in-calculator.el.patch --]
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From f28d1b1f9491c95319b7073d29bb67c0f5431145 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 5 Nov 2019 13:43:44 -0800
Subject: [PATCH] Pacify byte-compiler in calculator.el
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
* lisp/calculator.el (calculator-expt): Open-code cl-evenp to
pacify warning “the function ‘cl-evenp’ might not be defined”.
Problem reported by Juanma Barranquero in:
https://lists.gnu.org/r/emacs-devel/2019-11/msg00118.html
---
lisp/calculator.el | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/lisp/calculator.el b/lisp/calculator.el
index fab365d5f2..6c07ee2225 100644
--- a/lisp/calculator.el
+++ b/lisp/calculator.el
@@ -1620,7 +1620,9 @@ calculator-expt
(condition-case nil
(expt x y)
(overflow-error
- (if (or (natnump x) (cl-evenp y))
+ ;; X and Y must be integers, as expt silently returns floating-point
+ ;; infinity on floating-point overflow.
+ (if (or (natnump x) (zerop (logand x 1)))
1.0e+INF
-1.0e+INF))))
--
2.23.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: master 3843711 3/3: Simplify calculator-expt
2019-11-05 19:29 ` Stefan Monnier
@ 2019-11-05 21:47 ` Paul Eggert
0 siblings, 0 replies; 6+ messages in thread
From: Paul Eggert @ 2019-11-05 21:47 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
On 11/5/19 11:29 AM, Stefan Monnier wrote:
>> + (if (or (natnump x) (cl-evenp y))
>
> `cl-evenp` doesn't do the `truncate` part, so this will signal an error if
> `x` is not a natural number and `y` is not an integer.
Not a problem, as this part of the code is reachable only if Y is an
integer. I added a comment to that effect.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: master 3843711 3/3: Simplify calculator-expt
@ 2020-04-16 20:36 jakub-w
2020-04-16 20:56 ` Paul Eggert
0 siblings, 1 reply; 6+ messages in thread
From: jakub-w @ 2020-04-16 20:36 UTC (permalink / raw)
To: Paul Eggert; +Cc: emacs-devel
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Good thing I decided to read the mailing list 5 months after the patch
was submitted. There was a typo that would be pretty hard to catch.
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[-- Attachment #1.2: 0001-Fix-a-typo-in-calculator.el.patch --]
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From 9acd26cf70decf20240f5485d6f12f4cf22c2a80 Mon Sep 17 00:00:00 2001
From: jakub-w <jakub-w@riseup.net>
Date: Thu, 16 Apr 2020 22:07:14 +0200
Subject: [PATCH] Fix a typo in calculator.el
* lisp/calculator.el (calculator-expt): Overflowing exponentiation
caused the function to return -1.0e+INF if the base was an odd,
negative number, no matter what the exponent was.
---
lisp/calculator.el | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lisp/calculator.el b/lisp/calculator.el
index c1af26ffcc..6996990814 100644
--- a/lisp/calculator.el
+++ b/lisp/calculator.el
@@ -1622,7 +1622,7 @@ calculator-expt
(overflow-error
;; X and Y must be integers, as expt silently returns floating-point
;; infinity on floating-point overflow.
- (if (or (natnump x) (zerop (logand x 1)))
+ (if (or (natnump x) (zerop (logand y 1)))
1.0e+INF
-1.0e+INF))))
--
2.26.1
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: master 3843711 3/3: Simplify calculator-expt
2020-04-16 20:36 jakub-w
@ 2020-04-16 20:56 ` Paul Eggert
0 siblings, 0 replies; 6+ messages in thread
From: Paul Eggert @ 2020-04-16 20:56 UTC (permalink / raw)
To: jakub-w; +Cc: emacs-devel
On 4/16/20 1:36 PM, jakub-w@riseup.net wrote:
> Good thing I decided to read the mailing list 5 months after the patch
> was submitted. There was a typo that would be pretty hard to catch.
Thanks for catching that typo. Since it's a regression that I introduced in
November, I installed the patch into the emacs-27 branch; in due course the
patch should be merged into Emacs master.
^ permalink raw reply [flat|nested] 6+ messages in thread
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[not found] ` <20191105074004.5063220A3C@vcs0.savannah.gnu.org>
2019-11-05 11:28 ` master 3843711 3/3: Simplify calculator-expt Juanma Barranquero
2019-11-05 21:45 ` Paul Eggert
2019-11-05 19:29 ` Stefan Monnier
2019-11-05 21:47 ` Paul Eggert
2020-04-16 20:36 jakub-w
2020-04-16 20:56 ` Paul Eggert
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