From: Ben Elliston <bje@redhat.com>
To: cgen@sources.redhat.com
Subject: operating on individual register bits
Date: Thu, 17 May 2001 23:55:00 -0000 [thread overview]
Message-ID: <15108.51009.551848.162882@scooby.apac.redhat.com> (raw)
Frequently, I find myself wanting to set and clear individual bits of
hardware registers in rtl. Perhaps such a mechanism already exists.
If it does, I'm not aware of it. Here is the canonical example:
(set cc.z 1)
versus:
(set cc (or cc (sll SI 1 10))),
which makes much less sense to the reader.
Is it sensible to extend cgen to give names to individual bits of a
register such that operands on registers can adopt this C/Pascal-style
syntax for accessing individual bits?
Ben
next reply other threads:[~2001-05-17 23:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-17 23:55 Ben Elliston [this message]
2001-05-18 5:00 ` Johan Rydberg
2001-05-18 7:54 ` Doug Evans
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