OpenHarmony/third_party_mesa3d
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

nir/algebraic: add optimizations for imul(a, INT_MIN)

Browse Source 
is_pos_power_of_two would catch this, but nir_op_imul has signed sources,
so is_neg_power_of_two catches it instead, which creates a useless
nir_op_ineg.

fossil-db (Sienna Cichlid):
Totals from 1014 (0.68% of 150170) affected shaders:
CodeSize: 3592296 -> 3592288 (-0.00%); split: -0.00%, +0.00%
Instrs: 671211 -> 670426 (-0.12%)
Latency: 5268917 -> 5268479 (-0.01%); split: -0.01%, +0.00%
InvThroughput: 2187349 -> 2187343 (-0.00%); split: -0.00%, +0.00%
VClause: 8634 -> 8636 (+0.02%)
Copies: 97585 -> 97604 (+0.02%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12039>
This commit is contained in:
Rhys Perry
2021-07-21 17:03:01 +01:00
committed by Marge Bot
parent 65cd5a0f22
commit b009467b81
1 changed files with 4 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/compiler/nir/nir_opt_algebraic.py
View File

@@ -95,6 +95,10 @@ def intBitsToFloat(i):
optimizations = [
(('imul', a, '#b(is_pos_power_of_two)'), ('ishl', a, ('find_lsb', b)), '!options->lower_bitops'),
(('imul', 'a@8', 0x80), ('ishl', a, 7), '!options->lower_bitops'),
(('imul', 'a@16', 0x8000), ('ishl', a, 15), '!options->lower_bitops'),
(('imul', 'a@32', 0x80000000), ('ishl', a, 31), '!options->lower_bitops'),
(('imul', 'a@64', 0x8000000000000000), ('ishl', a, 63), '!options->lower_bitops'),
(('imul', a, '#b(is_neg_power_of_two)'), ('ineg', ('ishl', a, ('find_lsb', ('iabs', b)))), '!options->lower_bitops'),
(('ishl', a, '#b'), ('imul', a, ('ishl', 1, b)), 'options->lower_bitops'),