[Mesa-dev] [PATCH 04/13] i965/fs_inst: Add an is_copy_payload helper

[Kenneth Graunke]

On Tuesday, May 05, 2015 02:31:39 PM Jason Ekstrand wrote:
> On Tue, May 5, 2015 at 1:34 PM, Matt Turner <mattst88 at gmail.com> wrote:
> > On Tue, May 5, 2015 at 1:13 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> >> On Tue, Apr 14, 2015 at 1:28 AM, Kenneth Graunke <kenneth at whitecape.org> wrote:
> >>> 2. CSE didn't use equals(), so it allowed things like types to differ,
> >>>    or source modifiers...(which are probably bogus on LOAD_PAYLOADs
> >>>    anyway, so it may be moot...)
> >>>
> >>>    I like using equals().  But...it might make sense to relax BAD_FILE
> >>>    checks, i.e. reg_null_d and reg_null_f aren't different for practical
> >>>    purposes.  (Thinking of header registers...)
> >>
> >> It doesn't make sense to have something that copies entirely BAD_FILE.
> >
> > That's not what he's saying at all.
> >
> > Right now, equals() called on a pair of load_payloads, one with
> > reg_null_f and the other with reg_null_d as their first sources (that
> > is, the header) would return false. Intuitively, that's not what we
> > want.
> 
> Um... This is in is_copy_payload not CSE.  We aren't comparing two
> payloads, we're comparing src[i] with src[0] for all i.  How are they
> all going to be BAD_FILE?
> --Jason

Good point.  If one is BAD_FILE, they'd all be BAD_FILE.  Which is dumb
(and pretty much invalid).  Sorry for the confusion.  Carry on :)
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