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From: "Jan Beulich" <JBeulich@novell.com> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: middle-end/9725: Invalid dependency determination Date: Thu, 20 Feb 2003 08:06:00 -0000 [thread overview] Message-ID: <20030220080601.7701.qmail@sources.redhat.com> (raw) The following reply was made to PR middle-end/9725; it has been noted by GNATS. From: "Jan Beulich" <JBeulich@novell.com> To: <bangerth@ticam.utexas.edu> Cc: <velco@fadata.bg>,<gcc-bugs@gcc.gnu.org>, <gcc-gnats@gcc.gnu.org> Subject: Re: middle-end/9725: Invalid dependency determination Date: Thu, 20 Feb 2003 09:01:39 +0100 Which is almost as bad as the memcpy approach - the thing to be created that way (i.e. through a macro) can't possibly be an lvalue when supposed to access more than something contained within a single byte... I realized a supposedly legal (and working) approach anyway (though I continue to believe that the original bitfield approach is legal, too - just that it doesn't work with gcc...): Instead of having a union of aliased type and aliasing structure, add a flexible array of the aliased type to the end of the aliasing structure. >>> Wolfgang Bangerth <bangerth@ticam.utexas.edu> 19.02.03 18:14:43 >>> > of not using this logic - how do I access sub-fields of a built-in type Go through a char* which can alias everything. This special case exists for this particular purpose: accessing single bytes in other types. W. ------------------------------------------------------------------------- Wolfgang Bangerth email: bangerth@ticam.utexas.edu www: http://www.ticam.utexas.edu/~bangerth/
next reply other threads:[~2003-02-20 8:06 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-02-20 8:06 Jan Beulich [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-02-20 9:06 Momchil Velikov 2003-02-20 8:16 Joseph S. Myers 2003-02-20 7:46 Jan Beulich 2003-02-19 21:16 Momchil Velikov 2003-02-19 17:16 Jan Beulich 2003-02-19 17:16 Wolfgang Bangerth 2003-02-19 17:06 Wolfgang Bangerth 2003-02-17 16:56 Wolfgang Bangerth 2003-02-17 15:48 bangerth 2003-02-17 15:36 jbeulich
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