From: Miles Bader <miles.bader@necel.com>
To: Thien-Thi Nguyen <ttn@gnuvola.org>
Cc: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>, emacs-devel@gnu.org
Subject: Re: Untagging by subtraction instead of masking on USE_LSB_TAG
Date: Mon, 28 Jan 2008 13:25:30 +0900 [thread overview]
Message-ID: <buoodb6d1ad.fsf@dhapc248.dev.necel.com> (raw)
In-Reply-To: <buotzkyd1f5.fsf@dhapc248.dev.necel.com> (Miles Bader's message of "Mon, 28 Jan 2008 13:22:38 +0900")
Miles Bader <miles.bader@necel.com> writes:
> Note that the important value here is the EA, not the offset. Typically
> in a LSB tag scheme, the tags are arranged so that after adding these
> "funny" offsets, the resulting EA is aligned properly.
BTW, such a method won't work on architectures where offsets are
inherently aligned -- for instance, doesn't the x86 implicitly scale the
offset by the size of the value being loaded? Does anybody know what is
usually done on such an architecture?
Thanks,
-Miles
--
Year, n. A period of three hundred and sixty-five disappointments.
next prev parent reply other threads:[~2008-01-28 4:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-28 2:07 Untagging by subtraction instead of masking on USE_LSB_TAG YAMAMOTO Mitsuharu
2008-01-28 3:52 ` Thien-Thi Nguyen
2008-01-28 4:22 ` Miles Bader
2008-01-28 4:25 ` Miles Bader [this message]
2008-01-28 5:02 ` YAMAMOTO Mitsuharu
2008-01-28 15:07 ` Stefan Monnier
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