[Mesa-dev] [PATCH 0/9] NIR: Several optimization patches

[Matt Turner]

On Mon, Mar 23, 2015 at 8:13 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> This series contains several optimization-related patches that are all
> focussed around being able to do better at emitting MAD instructions.
>
> Final shader-db results for the whole series on Haswell:
>
>    total NIR instructions in shared programs: 2183472 -> 2152911 (-1.40%)
>    NIR instructions in affected programs:     1299664 -> 1269103 (-2.35%)
>    helped:                                    7106
>    HURT:                                      321
>
>    total FS instructions in shared programs:  4419884 -> 4378433 (-0.94%)
>    FS instructions in affected programs:      1895564 -> 1854113 (-2.19%)
>    helped:                                    10025
>    HURT:                                      221
>    GAINED:                                    81
>    LOST:                                      8
>
> There is one notable place where this hurts us.  There are three shaders in
> Kerbal Space Program that now spill.  However, this does not seem to be the
> fault of NIR.  See patch 8 for more details.
>
> Jason Ekstrand (9):
>   nir/algebraic: #define around structure definitions
>   nir/algebraic: Add a seperate section for "late" optimizations
>   i965/nir: Use the late optimizations
>   nir: Move the compare-with-zero optimizations to the late section
>   nir: Add a dedicated ffma peephole optimization
>   i965/nir: Use the dedicated ffma peephole
>   nir/peephole_ffma: Be less agressive about fusing multiply-adds
>   i965/nir: Run the ffma peephole after the rest of the optimizations
>   i965: Use the same nir options for all gens

1-3 are Reviewed-by: Matt Turner <mattst88 at gmail.com>

2+3 should be squashed together.

Part of 4 looks like it should be a separate commit.

Haven't reviewed 5, but should probably squash 5+6.

7 is Reviewed-by: Matt Turner <mattst88 at gmail.com>

8 - should split the DCE hunk into a separate patch.

9 is Reviewed-by: Matt Turner <mattst88 at gmail.com>