From: "Mattias Engdegård" <mattias.engdegard@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 65491@debbugs.gnu.org, monnier@iro.umontreal.ca
Subject: bug#65491: [PATCH] Improve performance allocating vectors
Date: Sat, 16 Sep 2023 18:54:27 +0200 [thread overview]
Message-ID: <FA940FDA-6FFB-4E80-B254-9266CD5E673A@gmail.com> (raw)
In-Reply-To: <B8175B38-691A-459A-B454-9AFE2ED7E254@gmail.com>
16 sep. 2023 kl. 18.32 skrev Mattias Engdegård <mattias.engdegard@gmail.com>:
> #define XUNTAG(a, type, ctype) \
> ((ctype *) ((uintptr_t) XLP (a) - (uintptr_t)LISP_WORD_TAG (type)))
I pushed this to master after some experiments.
Interestingly, Clang didn't warn about the new code at all. On the other hand, it did probably warn about the old code (with your configuration), because
char *g(char *p) {return p+(1ULL<<62);}
results in
<source>:8:26: warning: the pointer incremented by 4611686018427387904 refers past the last possible element for an array in 32-bit address space containing 8-bit (1-byte) elements (max possible 4294967296 elements) [-Warray-bounds]
char *g(char *p) {return p+(1ULL<<62);}
^ ~~~~~~~~
<source>:8:9: note: array 'p' declared here
char *g(char *p) {return p+(1ULL<<62);}
^
but GCC thinks it's fine.
next prev parent reply other threads:[~2023-09-16 16:54 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-24 9:59 bug#65491: [PATCH] Improve performance allocating vectors Ihor Radchenko
2023-08-26 7:14 ` Eli Zaretskii
2023-08-26 7:27 ` Ihor Radchenko
2023-08-26 7:31 ` Eli Zaretskii
2023-08-26 7:51 ` Ihor Radchenko
2023-08-26 8:07 ` Ihor Radchenko
2023-08-26 9:01 ` Eli Zaretskii
2023-08-26 7:47 ` Ihor Radchenko
2023-08-26 12:01 ` Mattias Engdegård
2023-08-26 14:54 ` Ihor Radchenko
2023-08-26 14:55 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-27 9:54 ` Mattias Engdegård
2023-09-16 14:58 ` Mattias Engdegård
2023-09-16 16:12 ` Eli Zaretskii
2023-09-16 16:17 ` Eli Zaretskii
2023-09-16 16:32 ` Mattias Engdegård
2023-09-16 16:54 ` Eli Zaretskii
2023-09-16 17:03 ` Mattias Engdegård
2023-09-16 17:11 ` Eli Zaretskii
2023-09-17 3:02 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-17 17:02 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-18 2:19 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-18 2:27 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-18 3:08 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-18 4:10 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-16 16:54 ` Mattias Engdegård [this message]
2023-09-16 17:09 ` Eli Zaretskii
2023-09-16 17:22 ` Mattias Engdegård
2023-09-16 18:19 ` Eli Zaretskii
2023-09-16 19:04 ` Mattias Engdegård
2023-09-16 19:46 ` Paul Eggert
2023-09-17 5:18 ` Eli Zaretskii
2023-09-17 15:22 ` Paul Eggert
2023-09-17 16:15 ` Eli Zaretskii
2023-09-17 16:37 ` Paul Eggert
2023-09-17 16:44 ` Eli Zaretskii
2023-09-18 16:10 ` Mattias Engdegård
2023-09-18 17:13 ` Eli Zaretskii
2023-09-19 13:28 ` Mattias Engdegård
2023-09-19 14:04 ` Eli Zaretskii
2023-09-19 14:05 ` Mattias Engdegård
2023-09-25 16:06 ` Mattias Engdegård
2023-08-27 16:21 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-28 10:14 ` Ihor Radchenko
2023-08-28 16:32 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-28 12:47 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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