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nir/algebraic: Be more careful converting ushr to extract_u8/16

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If it's not the right bit-size, it may not actually be the correct
extraction.  For now, we'll only worry about 32-bit versions.

Fixes: 905ff86198 "nir: Recognize open-coded extract_u16"
Fixes: 76289fbfa8 "nir: Recognize open-coded extract_u8"
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit 116b47fe3c)
This commit is contained in:
Jason Ekstrand 2018-08-14 15:10:22 -05:00 • committed by Dylan Baker
parent 8c3aee4038
commit 16d44d1e98
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_opt_algebraic.py
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@ -427,13 +427,13 @@ optimizations = [
('unpack_64_2x32_split_y', a)), a),
# Byte extraction
(('ushr', a, 24), ('extract_u8', a, 3), '!options->lower_extract_byte'),
(('ushr', 'a@32', 24), ('extract_u8', 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'),
# Word extraction
(('ushr', a, 16), ('extract_u16', a, 1), '!options->lower_extract_word'),
(('ushr', 'a@32', 16), ('extract_u16', a, 1), '!options->lower_extract_word'),
(('iand', 0xffff, a), ('extract_u16', a, 0), '!options->lower_extract_word'),
# Subtracts