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nir/algebraic: Remove redundant extract_[iu]8 patterns 

No shader-db changes on any Intel platform.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Ian Romanick 2019-02-27 20:08:38 -08:00
parent c152672e68
commit bc17f5a2a3
1 changed files with 4 additions and 14 deletions
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18
src/compiler/nir/nir_opt_algebraic.py
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@ -611,22 +611,13 @@ optimizations = [
('unpack_64_2x32_split_y', a)), a),
# Byte extraction
(('ushr', ('ishl', 'a@32', 24), 24), ('extract_u8', a, 0), '!options->lower_extract_byte'),
(('ushr', ('ishl', 'a@32', 16), 24), ('extract_u8', a, 1), '!options->lower_extract_byte'),
(('ushr', ('ishl', 'a@32', 8), 24), ('extract_u8', a, 2), '!options->lower_extract_byte'),
(('ushr', 'a@32', 24), ('extract_u8', a, 3), '!options->lower_extract_byte'),
(('ishr', ('ishl', 'a@32', 24), 24), ('extract_i8', a, 0), '!options->lower_extract_byte'),
(('ishr', ('ishl', 'a@32', 16), 24), ('extract_i8', a, 1), '!options->lower_extract_byte'),
(('ishr', ('ishl', 'a@32', 8), 24), ('extract_i8', a, 2), '!options->lower_extract_byte'),
(('ishr', 'a@32', 24), ('extract_i8', a, 3), '!options->lower_extract_byte'),
(('iand', 0xff, ('ushr', a, 16)), ('extract_u8', a, 2), '!options->lower_extract_byte'),
(('iand', 0xff, ('ushr', a, 8)), ('extract_u8', a, 1), '!options->lower_extract_byte'),
(('iand', 0xff, a), ('extract_u8', a, 0), '!options->lower_extract_byte')
]
# The ('extract_u8', a, 0) pattern, above, can trigger in cases where the
# shift count is based on a loop induction variable. Once the loop is
# unrolled, constant folding will generate patterns like those below.
# After the ('extract_u8', a, 0) pattern, above, triggers, there will be
# patterns like those below.
for op in ('ushr', 'ishr'):
optimizations.extend([(('extract_u8', (op, 'a@16', 8), 0), ('extract_u8', a, 1))])
optimizations.extend([(('extract_u8', (op, 'a@32', 8 * i), 0), ('extract_u8', a, i)) for i in range(1, 4)])
@ -634,9 +625,8 @@ for op in ('ushr', 'ishr'):
optimizations.extend([(('extract_u8', ('extract_u16', a, 1), 0), ('extract_u8', a, 2))])
# The ('extract_[iu]8', a, 3) patterns, above, can trigger in cases where the
# shift count is based on a loop induction variable. Once the loop is
# unrolled, constant folding will generate patterns like those below.
# After the ('extract_[iu]8', a, 3) patterns, above, trigger, there will be
# patterns like those below.
for op in ('extract_u8', 'extract_i8'):
optimizations.extend([((op, ('ishl', 'a@32', 24 - 8 * i), 3), (op, a, i)) for i in range(2, -1, -1)])