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

No shader-db changes on any Intel platform.

Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Dylan Baker <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>

1 files changed, 4 insertions, 14 deletions

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index cb47a4bbba3..70720efe048 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -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)])