From: Paul Koning <pkoning@equallogic.com>
To: pinskia@physics.uc.edu
Cc: mrs@apple.com, dave.korn@artimi.com, gcc@sources.redhat.com,
sjackman@gmail.com
Subject: Re: memcpy to an unaligned address
Date: Tue, 02 Aug 2005 20:46:00 -0000 [thread overview]
Message-ID: <17135.56182.648000.413121@gargle.gargle.HOWL> (raw)
In-Reply-To: <200508022037.j72Kbr4T012558@earth.phy.uc.edu>
>>>>> "Andrew" == Andrew Pinski <pinskia@physics.uc.edu> writes:
>> Yes, this is a compiler bug in the expansion of memcpy, please
>> file a bug report. The solution is for the compiler to notice the
>> memory alignment of the destination and `do-the-right-thing' when
>> it isn't aligned.
Andrew> No it is not, once you take the address (which should be
Andrew> rejected), it is of type "unsigned int *" and not unaligned
Andrew> variable, passing it to memcpy assumes the type alignment is
Andrew> the natural alignment.
That seems like a misfeature.
It sounds like the workaround is to avoid memcpy, and just use
variable assignment. Alternatively, cast the pointers to char*, which
should force memcpy to do the right thing. Ugh.
paul
next prev parent reply other threads:[~2005-08-02 20:46 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-02 17:32 Shaun Jackman
2005-08-02 17:43 ` Dave Korn
2005-08-02 19:13 ` Shaun Jackman
2005-08-02 19:19 ` Paul Koning
2005-08-02 19:26 ` Shaun Jackman
2005-08-02 19:40 ` Dave Korn
2005-08-02 19:48 ` Paul Koning
2005-08-02 20:15 ` Shaun Jackman
2005-08-02 20:29 ` Mike Stump
2005-08-02 20:38 ` Andrew Pinski
2005-08-02 20:45 ` Ian Lance Taylor
2005-08-02 21:30 ` Mike Stump
2005-08-02 21:34 ` Joe Buck
2005-08-03 18:00 ` Richard Henderson
2005-08-03 18:15 ` Shaun Jackman
2005-08-03 18:19 ` Dave Korn
2005-08-03 21:26 ` Richard Henderson
2005-08-04 4:42 ` Ian Lance Taylor
2005-08-04 12:40 ` Paul Koning
2005-08-02 20:46 ` Paul Koning [this message]
2005-08-02 22:17 ` Shaun Jackman
2005-08-03 17:16 ` Paul Koning
2005-08-02 22:26 ` Shaun Jackman
2005-08-02 22:29 ` Shaun Jackman
2005-08-02 21:05 ` Mike Stump
2005-08-02 21:11 ` Joe Buck
2005-08-02 22:15 ` Shaun Jackman
2005-08-02 22:12 ` Joe Buck
2005-08-02 20:29 ` Paul Koning
2005-08-02 17:48 ` Falk Hueffner
2005-08-02 18:03 ` Mike Stump
[not found] <345be691050804025955c0b4ab@mail.gmail.com>
2005-08-04 15:06 ` Shaun Jackman
2005-08-04 15:09 ` Christian Joensson
2005-08-05 8:41 ` Carl Whitwell
2005-08-05 16:09 ` Shaun Jackman
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