On 05/30/2018 01:48 AM, Samuel Pitoiset wrote:
> Totals from affected shaders:
> SGPRS: 80 -> 80 (0.00 %)
> VGPRS: 48 -> 48 (0.00 %)
> Code Size: 2120 -> 2096 (-1.13 %) bytes
> Max Waves: 16 -> 16 (0.00 %)
> 
> Only two Rise of Tomb Raider shaders are affected on my side.

I got:

total instructions in shared programs: 14371513 -> 14371511 (<.01%)
instructions in affected programs: 155 -> 153 (-1.29%)
helped: 1
HURT: 0

total cycles in shared programs: 532435951 -> 532435927 (<.01%)
cycles in affected programs: 16696 -> 16672 (-0.14%)
helped: 1
HURT: 0

The only shader affected was a compute shader in Deus Ex.  It looks like
we don't have RotTR in our shader-db, so we'll have to fix that.

Reviewed-by: Ian Romanick <[email protected]>

> Cc: Ian Romanick <[email protected]>
> Signed-off-by: Samuel Pitoiset <[email protected]>
> ---
>  src/compiler/nir/nir_opt_algebraic.py | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/src/compiler/nir/nir_opt_algebraic.py 
> b/src/compiler/nir/nir_opt_algebraic.py
> index 909ea3daf4..95b5813bd7 100644
> --- a/src/compiler/nir/nir_opt_algebraic.py
> +++ b/src/compiler/nir/nir_opt_algebraic.py
> @@ -280,6 +280,8 @@ optimizations = [
>     (('iand', ('uge(is_used_once)', a, b), ('uge', a, c)), ('uge', a, 
> ('umax', b, c))),
>     (('iand', ('uge(is_used_once)', a, c), ('uge', b, c)), ('uge', ('umin', 
> a, b), c)),
>  
> +   (('iand', ('ieq', 'a@32', 0), ('ieq', 'b@32', 0)), ('ieq', ('ior', 
> 'a@32', 'b@32'), 0)),
> +
>     # These patterns can result when (a < b || a < c) => (a < min(b, c))
>     # transformations occur before constant propagation and loop-unrolling.
>     (('~flt', a, ('fmax', b, a)), ('flt', a, b)),
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