[Mesa-dev] [PATCH 3/3] nir: Add algebraic optimizations for comparisons with identical operands.

[Jason Ekstrand]

Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>
On Feb 6, 2015 9:16 PM, "Eric Anholt" <eric at anholt.net> wrote:

> No change on shader-db on i965.
> ---
>  src/glsl/nir/nir_opt_algebraic.py | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/src/glsl/nir/nir_opt_algebraic.py
> b/src/glsl/nir/nir_opt_algebraic.py
> index a5fe19a..0512a8f 100644
> --- a/src/glsl/nir/nir_opt_algebraic.py
> +++ b/src/glsl/nir/nir_opt_algebraic.py
> @@ -83,6 +83,15 @@ optimizations = [
>     (('fne', ('fadd', a, b), 0.0), ('fne', a, ('fneg', b))),
>     (('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
>     (('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a)),
> +   # Comparison with the same args.  Note that these are not done for
> +   # the float versions because float equality is used to test for
> +   # NaN.
> +   (('ilt', a, a), False),
> +   (('ige', a, a), True),
> +   (('ieq', a, a), True),
> +   (('ine', a, a), False),
> +   (('ult', a, a), False),
> +   (('uge', a, a), True),
>     # Logical and bit operations
>     (('fand', a, 0.0), 0.0),
>     (('iand', a, a), a),
> --
> 2.1.4
>
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