This is the mail archive of the
cgen@sources.redhat.com
mailing list for the CGEN project.
Re: how to test which register is being used?
- To: matthew green <mrg at cygnus dot com>
- Subject: Re: how to test which register is being used?
- From: "J. Johnston" <jjohnstn at cygnus dot com>
- Date: Tue, 05 Sep 2000 15:39:46 -0400
- CC: cgen at sources dot redhat dot com
- Organization: Red Hat Inc.
- References: <301.968181140@cygnus.com>
matthew green wrote:
>
> hi folks.
>
> how can one determine which register is being used, rather than
> the value of the register? i need to determine (in several
> instructions) whether r6 or r7 are being used, and if so, set
> a status bit (one for r6, one for r7). the only solution i can
> think of (that bje also suggested) was to have something in the
> getter/setter to allow this, but as not every time these registers
> are used are the status bits set, so this would not be correct.
>
> thanks,
>
> .mrg.
You should be able to access using the ifield operator to get the
value in the field that the operand is based on.
-- Jeff J.