From: Johan Rydberg <johan.rydberg@netinsight.se>
To: Ben Elliston <bje@redhat.com>
Cc: cgen@sources.redhat.com
Subject: Re: operating on individual register bits
Date: Fri, 18 May 2001 05:00:00 -0000 [thread overview]
Message-ID: <3B050EEB.161E1E66@netinsight.se> (raw)
In-Reply-To: <15108.51009.551848.162882@scooby.apac.redhat.com>
Ben Elliston wrote:
>
> 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.
To my knowledge there is no such rtx fns. Looking at your reply to
the same question asked by me some time ago:
http://sources.redhat.com/ml/cgen/2001-q1/msg00062.html
> 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?
That would be great!
regards,
johan
next prev parent reply other threads:[~2001-05-18 5:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-17 23:55 Ben Elliston
2001-05-18 5:00 ` Johan Rydberg [this message]
2001-05-18 7:54 ` Doug Evans
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