From: kenner@vlsi1.ultra.nyu.edu (Richard Kenner)
To: dje@watson.ibm.com
Cc: gcc-patches@gcc.gnu.org, gcc@gcc.gnu.org
Subject: Re: DATA_ALIGNMENT vs. DECL_USER_ALIGNMENT
Date: Thu, 10 Apr 2003 21:31:00 -0000 [thread overview]
Message-ID: <10304102114.AA02800@vlsi1.ultra.nyu.edu> (raw)
Yes, the type can have greater alignment. However type normally does
imply a minimum alignment and minimum size. Specifying user alignment
for a well-defined type seems redundant.
You lost me.
If I have a record of two 16-bit fields, the natural alignment of that type
is 16 bits. However, the user is allowed to specify an alignment of 32
bits for the type.
I'm not sure what your second sentence means, but it is indeed true
that the compiler cannot change the alignment of a type since it
bounds it in both directions: it gives the minimum alignment that an
object of that type created by the compiler is guaranteed to have, but
it also gives the *maximum* alignment that the compiler is allowed to assume
that a user-created object of that type will have.
next reply other threads:[~2003-04-10 21:10 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-10 21:31 Richard Kenner [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-04-23 3:29 Robert Dewar
2003-04-23 2:20 Richard Kenner
2003-04-23 5:31 ` Alexandre Oliva
2003-04-24 6:23 ` Jason Merrill
2003-04-24 8:43 ` Geert Bosch
2003-04-24 17:48 ` Jason Merrill
2003-04-24 18:04 ` Zack Weinberg
2003-04-24 19:31 ` Jason Merrill
2003-04-24 21:32 ` Geert Bosch
2003-04-24 23:24 ` Jason Merrill
2003-04-25 2:56 ` Richard Henderson
2003-04-22 15:08 Richard Kenner
2003-04-23 1:07 ` Alexandre Oliva
2003-04-22 0:15 Robert Dewar
2003-04-22 1:58 ` Jamie Lokier
2003-04-22 0:11 Robert Dewar
2003-04-22 1:35 ` Jamie Lokier
2003-04-21 21:25 Richard Kenner
2003-04-21 20:59 Richard Kenner
2003-04-21 21:14 ` Jamie Lokier
2003-04-21 20:45 Richard Kenner
2003-04-21 20:58 ` Jamie Lokier
2003-04-21 18:14 Richard Kenner
2003-04-21 20:33 ` Jamie Lokier
2003-04-21 17:25 Richard Kenner
2003-04-21 18:14 ` Jamie Lokier
2003-04-22 9:00 ` Alexandre Oliva
2003-04-20 21:28 Robert Dewar
2003-04-21 17:05 ` Alexandre Oliva
2003-04-20 21:19 Robert Dewar
2003-04-18 11:41 Richard Kenner
2003-04-18 8:06 Richard Kenner
2003-04-18 8:59 ` Richard Henderson
2003-04-17 21:41 Richard Kenner
2003-04-17 23:20 ` Alexandre Oliva
2003-04-18 1:16 ` Richard Henderson
2003-04-17 21:40 Richard Kenner
2003-04-17 11:56 Richard Kenner
2003-04-17 20:35 ` Alexandre Oliva
2003-04-17 22:41 ` Geert Bosch
2003-04-17 23:19 ` Alexandre Oliva
2003-04-17 10:44 Robert Dewar
2003-04-17 20:30 ` Alexandre Oliva
2003-04-17 8:12 Richard Kenner
2003-04-17 8:38 ` Alexandre Oliva
2003-04-11 22:26 Robert Dewar
2003-04-11 16:59 Robert Dewar
2003-04-11 18:49 ` Laurent Guerby
2003-04-11 16:51 Robert Dewar
2003-04-11 14:52 Robert Dewar
2003-04-11 4:45 Richard Kenner
2003-04-17 5:39 ` Alexandre Oliva
2003-04-11 0:45 Ulrich Weigand
2003-04-10 22:43 Richard Kenner
2003-04-11 0:31 ` Richard Henderson
2003-04-11 2:19 ` David Edelsohn
2003-04-10 22:23 Richard Kenner
2003-04-10 22:16 Richard Kenner
2003-04-10 22:07 Richard Kenner
2003-04-10 22:23 ` David Edelsohn
2003-04-10 22:05 Robert Dewar
2003-04-10 22:02 Richard Kenner
2003-04-10 22:24 ` Richard Henderson
2003-04-11 11:20 ` Laurent Guerby
2003-04-11 11:57 ` Arnaud Charlet
2003-04-11 14:16 ` Laurent Guerby
2003-04-10 21:56 Richard Kenner
2003-04-10 22:02 ` David Edelsohn
2003-04-10 21:45 Richard Kenner
2003-04-10 21:52 ` David Edelsohn
2003-04-10 21:57 ` Richard Henderson
2003-04-10 21:44 Richard Kenner
2003-04-10 21:32 Robert Dewar
2003-04-10 21:32 ` David Edelsohn
2003-04-10 21:29 Robert Dewar
2003-04-10 21:10 Richard Kenner
2003-04-10 21:10 Robert Dewar
2003-04-10 21:17 ` David Edelsohn
2003-04-10 21:04 Richard Kenner
2003-04-10 21:41 ` Geoff Keating
2003-04-10 20:57 Robert Dewar
2003-04-10 21:07 ` Ulrich Weigand
2003-04-10 20:52 Robert Dewar
2003-04-10 20:39 Richard Kenner
2003-04-10 21:00 ` Geoff Keating
2003-04-10 21:01 ` Ulrich Weigand
2003-04-10 21:44 ` Richard Henderson
2003-04-10 20:13 Richard Kenner
2003-04-10 20:28 ` Ulrich Weigand
2003-04-10 19:20 Richard Kenner
2003-04-10 5:33 Richard Kenner
2003-04-10 7:20 ` Ulrich Weigand
2003-04-09 23:31 Ulrich Weigand
2003-04-10 2:27 ` Richard Henderson
2003-04-10 3:10 ` Ulrich Weigand
2003-04-10 16:20 ` Ulrich Weigand
2003-04-10 16:39 ` Geoff Keating
2003-04-10 16:44 ` Ulrich Weigand
2003-04-10 18:06 ` Richard Henderson
2003-04-08 17:47 Ulrich Weigand
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