From: David Edelsohn <dje@watson.ibm.com>
To: Takashi Oe <toe@unlserve.unl.edu>
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: a GCC question
Date: Sat, 05 Aug 2000 22:31:57 -0400 [thread overview]
Message-ID: <200008060231.WAA22602@mal-ach.watson.ibm.com> (raw)
In-Reply-To: Message from Takashi Oe <toe@unlserve.unl.edu> of "Sat, 05 Aug 2000 21:15:28 CDT." <Pine.LNX.3.96LJ1.1b7.1000805204429.649H-100000@ofey.earthlink.net>
I would guess that for smaller numbers of cases, GCC is deciding
that it is more efficient to use a series of "if" statements for a
decision tree instead of a switch statement. You can explicitly code it
as such, e.g.,
if (bi->dispDeviceDepth == 32)
...
else if (bi-dispDeviceDepth == 16)
...
else if
...
else abort();
(BTW you do not provide a default case for some illegal value in your
switch statement.)
David
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-08-06 2:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-06 2:15 a GCC question Takashi Oe
2000-08-06 2:31 ` David Edelsohn [this message]
2000-08-06 3:20 ` Takashi Oe
2000-08-06 3:34 ` David Edelsohn
2000-08-06 4:05 ` Takashi Oe
2000-08-06 4:57 ` David Edelsohn
2000-08-06 6:01 ` Takashi Oe
2000-08-06 9:45 ` Timothy A. Seufert
2000-08-06 12:34 ` Takashi Oe
2000-08-06 13:06 ` Olaf Hering
2000-08-06 13:46 ` Takashi Oe
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