[Piglit] [PATCH] shaders: Add test for conditional mod propagation with different types.
kenneth at whitecape.org
Tue Mar 3 13:44:16 PST 2015
On Monday, March 02, 2015 11:03:01 AM Matt Turner wrote:
> The i965 driver has a pass that merges comparisons with zero into the
> instruction that generated the result. For example:
> add tmp x y
> cmp.ge.f0 null tmp 0.0
> is optimized into
> add.ge.f0 tmp x y
> If the types of tmp are different in the add and cmp, comparisons
> against zero might not work the same. For instance if the addition is on
> unsigned integers, they may generate a result of 0x80000000 which is
> -0.0 reinterpreted as a float.
> I think this test triggers the same bug as this bug report.
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89317
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
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