Re: [RfC] Testing for null

[Gordon Henriksen]

On Monday, December 8, 2003, at 10:03 , Dan Sugalski wrote:

At 1:21 PM -0500 12/3/03, Melvin Smith wrote:
We should have 1 recommended  way for testing NULL registers.

If we support get_bool() then lets make sure it works for REAL NULL
pmc registers as well as PMCNULL.
If not, code will appear to work correctly on a "safe" core
but will seg fault on some other. Also, I see no reason not
to use PMCNULL in all cores now.
Okay, lets do this:

Add an isnull branch op:

  isnull Px, destination
How about this to test if Px is really null?

        null Py
        eq_addr Px, Py
—

Gordon Henriksen
[EMAIL PROTECTED]