From: Geoff Levand <geoffrey.levand@am.sony.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>,
Linux/PPC Development <linuxppc-dev@ozlabs.org>,
linux-sparse@vger.kernel.org,
Andrew Pinski <Andrew_Pinski@PlayStation.Sony.Com>
Subject: Re: cast truncates bits from constant value (8000000000000000 becomes 0)
Date: Fri, 01 Dec 2006 13:17:08 -0800 [thread overview]
Message-ID: <45709BD4.80505@am.sony.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0612011242050.3695@woody.osdl.org>
Linus Torvalds wrote:
> Btw, try this stupid program, to see just how _strange_ gcc enums are.. A
> sizeof of the enum is not the same as the size of the individual entries.
Yes, interesting. I think your comment regarding compatibility with other
compilers is the convincing one.
Another way is to change the encoding of the value such that it fits into
the range of an enum. For this particular case, the values are actually
for a field in the high 3 bits, so I can just do the shift when the value
is used.
-Geoff
prev parent reply other threads:[~2006-12-01 21:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-22 4:20 [PATCH 8/14] powerpc: add ps3 platform repository support Geoff Levand
2006-12-01 14:25 ` cast truncates bits from constant value (8000000000000000 becomes 0) Geert Uytterhoeven
2006-12-01 14:39 ` Al Viro
2006-12-01 14:39 ` Al Viro
2006-12-01 14:55 ` Geert Uytterhoeven
2006-12-02 7:50 ` Michael Ellerman
2006-12-02 7:50 ` Michael Ellerman
2006-12-01 15:30 ` Linus Torvalds
2006-12-01 16:51 ` Geoff Levand
2006-12-01 20:20 ` Linus Torvalds
2006-12-01 20:49 ` Derek M Jones
2006-12-01 20:49 ` Derek M Jones
2006-12-01 21:00 ` Al Viro
2006-12-01 21:00 ` Al Viro
2006-12-01 21:19 ` Linus Torvalds
2006-12-01 21:19 ` Linus Torvalds
2006-12-01 20:50 ` Linus Torvalds
2006-12-01 21:17 ` Geoff Levand [this message]
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