GNU bug report logs - #18767
24.4; incorrect byte-compile on arithmatic comparisons

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Package: emacs;

Reported by: Shigeru Fukaya <shigeru.fukaya <at> gmail.com>

Date: Sat, 18 Oct 2014 20:00:02 UTC

Severity: normal

Found in version 24.4

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Shigeru Fukaya <shigeru.fukaya <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4; incorrect byte-compile on arithmatic comparisons
Date: Sun, 19 Oct 2014 04:58:31 +0900

Hello,

byte-compile of arithmatic comparison operators on more than two
arguments is incorrect.

(disassemble (lambda () (< (a) (b) (c))))

byte code:
  args: nil
0	constant  a
1	call	  0
2	constant  b
3	call	  0
4	lss	  
5	goto-if-nil-else-pop 1
8	constant  b
9	call	  0
10	constant  c
11	call	  0
12	lss	  
13:1	return	  


Functions a, b, c should be called once respectively if the function
has possibility of side effect.
But b may be called twice, and c may not be called.


I'm sorry for late report at the very time of release, but I noticed
just now.

Regards,
Shigeru
This bug report was last modified 10 years and 277 days ago.

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