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nir/algebraic: Remove unnecessary iand of [iu]bfe and bfm sources 

The [iu]bfe and bfm instructions are defined to only use the five
least significant bits.
This optimizes a common pattern from D3D -> SPIR-V translation.

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Daniel Schürmann 2019-01-25 13:56:49 +01:00 committed by Daniel Schürmann
parent 165b7f3a44
commit 4eeb49ea71
1 changed files with 8 additions and 0 deletions
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8
src/compiler/nir/nir_opt_algebraic.py
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@ -809,6 +809,14 @@ optimizations.extend([
('ubfe', 'value', 'offset', 'bits')),
'options->lower_bitfield_extract'),
# Note that these opcodes are defined to only use the five least significant bits of 'offset' and 'bits'
(('ubfe', 'value', 'offset', ('iand', 31, 'bits')), ('ubfe', 'value', 'offset', 'bits')),
(('ubfe', 'value', ('iand', 31, 'offset'), 'bits'), ('ubfe', 'value', 'offset', 'bits')),
(('ibfe', 'value', 'offset', ('iand', 31, 'bits')), ('ibfe', 'value', 'offset', 'bits')),
(('ibfe', 'value', ('iand', 31, 'offset'), 'bits'), ('ibfe', 'value', 'offset', 'bits')),
(('bfm', 'bits', ('iand', 31, 'offset')), ('bfm', 'bits', 'offset')),
(('bfm', ('iand', 31, 'bits'), 'offset'), ('bfm', 'bits', 'offset')),
(('ibitfield_extract', 'value', 'offset', 'bits'),
('bcsel', ('ieq', 0, 'bits'),
0,