[Mesa-dev] [PATCH 2/2] nir: Optimize a + neg(a)

[Jason Ekstrand]

Both patches are

Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>

On Sat, Feb 28, 2015 at 11:32 AM, Thomas Helland <thomashelland90 at gmail.com>
wrote:

> Shader-db i965 instructions:
> total instructions in shared programs: 1711180 -> 1711159 (-0.00%)
> instructions in affected programs:     825 -> 804 (-2.55%)
> helped:                                9
> HURT:                                  0
> GAINED:                                3
> LOST:                                  3
>
> Shader-db NIR instructions:
> total instructions in shared programs: 606187 -> 606179 (-0.00%)
> instructions in affected programs:     298 -> 290 (-2.68%)
> helped:                                4
> HURT:                                  0
> GAINED:                                0
> LOST:                                  0
>
> Signed-off-by: Thomas Helland <thomashelland90 at gmail.com>
> ---
>  src/glsl/nir/nir_opt_algebraic.py | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/src/glsl/nir/nir_opt_algebraic.py
> b/src/glsl/nir/nir_opt_algebraic.py
> index 688ceff..ef855aa 100644
> --- a/src/glsl/nir/nir_opt_algebraic.py
> +++ b/src/glsl/nir/nir_opt_algebraic.py
> @@ -58,6 +58,8 @@ optimizations = [
>     (('iadd', a, 0), a),
>     (('fadd', ('fmul', a, b), ('fmul', a, c)), ('fmul', a, ('fadd', b,
> c))),
>     (('iadd', ('imul', a, b), ('imul', a, c)), ('imul', a, ('iadd', b,
> c))),
> +   (('fadd', ('fneg', a), a), 0.0),
> +   (('iadd', ('ineg', a), a), 0),
>     (('fmul', a, 0.0), 0.0),
>     (('imul', a, 0), 0),
>     (('fmul', a, 1.0), a),
> --
> 2.2.1
>
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>
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