commit f503699e1068e1670355e3dc14f3d28419c5cbc3
author Daniel Schürmann <daniel@schuermann.dev> Fri Sep 18 13:50:25 2020 +0100
committer Marge Bot <eric+marge@anholt.net> Wed Oct 14 15:31:38 2020 +0000
tree d29f13a91e727f70e5f8319bbd631411160042aa
parent a38a497b86cffa9a67f95cb4a39c77642a2ef0a9

nir/opt_algebraic: optimize unpack_half_2x16_split_x(ushr, a, 16)

Same as extract_u16(a, 1)

Totals from 2021 (1.48% of 136546) affected shaders (RAVEN):
VGPRs: 129516 -> 129524 (+0.01%); split: -0.00%, +0.01%
CodeSize: 12485704 -> 12486600 (+0.01%); split: -0.00%, +0.01%
Instrs: 2435041 -> 2434999 (-0.00%); split: -0.00%, +0.00%
Cycles: 20952552 -> 20952624 (+0.00%); split: -0.00%, +0.00%
VMEM: 374492 -> 374212 (-0.07%); split: +0.01%, -0.08%
SMEM: 123309 -> 123291 (-0.01%); split: +0.00%, -0.02%
VClause: 64156 -> 64164 (+0.01%)
Copies: 191620 -> 191616 (-0.00%); split: -0.03%, +0.03%

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6777>

src/compiler/nir/nir_opt_algebraic.py

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index acd5a2b..d9e1222 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -1186,6 +1186,7 @@
 
    (('unpack_half_2x16_split_x', ('extract_u16', a, 0)), ('unpack_half_2x16_split_x', a)),
    (('unpack_half_2x16_split_x', ('extract_u16', a, 1)), ('unpack_half_2x16_split_y', a)),
+   (('unpack_half_2x16_split_x', ('ushr', a, 16)), ('unpack_half_2x16_split_y', a)),
    (('unpack_32_2x16_split_x', ('extract_u16', a, 0)), ('unpack_32_2x16_split_x', a)),
    (('unpack_32_2x16_split_x', ('extract_u16', a, 1)), ('unpack_32_2x16_split_y', a)),