From: "David S. Miller" <davem@redhat.com>
To: anton@samba.org
Cc: davej@suse.de, linux-kernel@vger.kernel.org
Subject: Re: results: Remove 8 bytes from struct page on 64bit archs
Date: Sun, 06 Jan 2002 21:13:52 -0800 (PST) [thread overview]
Message-ID: <20020106.211352.41877178.davem@redhat.com> (raw)
In-Reply-To: <20020107012555.GA6623@krispykreme>
In-Reply-To: <20020106.060824.106263786.davem@redhat.com> <Pine.LNX.4.33.0201061542450.3859-100000@Appserv.suse.de> <20020107012555.GA6623@krispykreme>
From: Anton Blanchard <anton@samba.org>
Date: Mon, 7 Jan 2002 12:25:55 +1100
Perhaps the compiler should be optimising this better (can we replace
the divide?)
As mentioned the PPC backend of gcc thinks that divides are cheaper
than multiplies. On sparc64 for example we get multiplies by a
constant when emitting constant divides.
If you can make the struct a power of two as well as smaller, that
would eliminate both problems here but not fix the apparent bug in the
PPC backend.
next prev parent reply other threads:[~2002-01-07 5:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-06 12:39 [PATCH] Remove 8 bytes from struct page on 64bit archs Anton Blanchard
2002-01-06 13:02 ` Horst von Brand
2002-01-06 13:07 ` Dave Jones
2002-01-06 13:13 ` Momchil Velikov
2002-01-06 13:25 ` Dave Jones
2002-01-06 13:28 ` William Lee Irwin III
2002-01-06 14:08 ` David S. Miller
2002-01-06 14:44 ` Dave Jones
2002-01-07 1:25 ` results: " Anton Blanchard
2002-01-07 3:22 ` Richard Henderson
2002-01-14 6:35 ` Anton Blanchard
2002-01-15 0:45 ` Dave Jones
2002-01-07 5:13 ` David S. Miller [this message]
2002-01-06 13:11 ` [PATCH] " William Lee Irwin III
2002-01-06 13:33 ` Anton Blanchard
2002-01-06 13:51 ` William Lee Irwin III
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