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From: Eli Zaretskii <eliz@gnu.org>
To: "Mattias Engdegård" <mattias.engdegard@gmail.com>
Cc: 65491@debbugs.gnu.org, monnier@iro.umontreal.ca
Subject: bug#65491: [PATCH] Improve performance allocating vectors
Date: Sat, 16 Sep 2023 19:54:02 +0300	[thread overview]
Message-ID: <83sf7egitx.fsf@gnu.org> (raw)
In-Reply-To: <B8175B38-691A-459A-B454-9AFE2ED7E254@gmail.com> (message from Mattias Engdegård on Sat, 16 Sep 2023 18:32:31 +0200)

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Sat, 16 Sep 2023 18:32:31 +0200
> Cc: 65491@debbugs.gnu.org,
>  monnier@iro.umontreal.ca
> 
> The new XUNTAG is:
> 
> #define XUNTAG(a, type, ctype) ((ctype *) \
> 				((uintptr_t) XLP (a) - LISP_WORD_TAG (type)))
> 
> so you get a warning from what, conversion of a 64-bit number to (ctype *)?

Yes, I think so:

  In file included from dispnew.c:27:
  lisp.h: In function 'PSEUDOVECTORP':
  lisp.h:813:33: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    813 | #define XUNTAG(a, type, ctype) ((ctype *) \
	|                                 ^
  lisp.h:374:6: note: in expansion of macro 'XUNTAG'
    374 |    ((XUNTAG ((a), Lisp_Vectorlike, union vectorlike_header)->size     \
	|      ^~~~~~
  lisp.h:1127:10: note: in expansion of macro 'lisp_h_PSEUDOVECTORP'
   1127 |   return lisp_h_PSEUDOVECTORP (a, code);
	|          ^~~~~~~~~~~~~~~~~~~~
  lisp.h: In function 'XSYMBOL_WITH_POS':
  lisp.h:813:33: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    813 | #define XUNTAG(a, type, ctype) ((ctype *) \
	|                                 ^
  lisp.h:1152:12: note: in expansion of macro 'XUNTAG'
   1152 |     return XUNTAG (a, Lisp_Vectorlike, struct Lisp_Symbol_With_Pos);
	|            ^~~~~~
  lisp.h: In function 'XBARE_SYMBOL':
  lisp.h:813:33: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    813 | #define XUNTAG(a, type, ctype) ((ctype *) \
	|                                 ^
  lisp.h:1159:27: note: in expansion of macro 'XUNTAG'
   1159 |   intptr_t i = (intptr_t) XUNTAG (a, Lisp_Symbol, struct Lisp_Symbol);
      |                           ^~~~~~

> Does changing the definition to
> 
> #define XUNTAG(a, type, ctype) \
>   ((ctype *) ((uintptr_t) XLP (a) - (uintptr_t)LISP_WORD_TAG (type)))
> 
> help? (That is, cast the LISP_WORD_TAG return value to uintptr_t.)

It does, but LISP_WORD_TAG(type) is a 64=bit type with the only bits
set above 32 bit, so how casting it to uintptr_t is TRT?

Why did you need to change the original cast in the first place?





  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 [this message]
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
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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