[Piglit] [PATCH] Test "double negative" corner case in copy propagation.

[Paul Berry]

On 19 September 2011 09:50, Eric Anholt <eric at anholt.net> wrote:

> On Thu, 15 Sep 2011 09:16:39 -0700, Paul Berry <stereotype441 at gmail.com>
> wrote:
> > This patch adds two tests that exercise a subtle corner case bug found
> > in Mesa with i965: If a value is negated, and then negated again, then
> > copy propagation would fail to un-do the negation.
> >
> > The bug only exists on i965 vertex shaders, but I went ahead and
> > added the equivalent fragment shader test for completeness.
>
> For bugs where I was definitely trying to trigger a copy-propagation
> bug, I was naming them glsl-*copy-propagation before.  Not a big deal
> either way.  Thanks for the tests!
>

Sounds reasonable to me.  I'll rename the tests and move them to the
"shaders" directory with the other copy propagation tests when I push the
patches.
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