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nir/algebraic: Optimize 64bit pack/unpack 

This reduces the instruction count in some fp64 and int64 piglit tests

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2017-02-14 22:22:36 -08:00
parent e10f522cd7
commit 70e86a3f2d
1 changed files with 6 additions and 0 deletions
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6
src/compiler/nir/nir_opt_algebraic.py
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@ -306,6 +306,12 @@ optimizations = [
(('fabs', ('b2f', a)), ('b2f', a)),
(('iabs', ('b2i', a)), ('b2i', a)),
# Packing and then unpacking does nothing
(('unpack_64_2x32_split_x', ('pack_64_2x32_split', a, b)), a),
(('unpack_64_2x32_split_y', ('pack_64_2x32_split', a, b)), b),
(('pack_64_2x32_split', ('unpack_64_2x32_split_x', a),
('unpack_64_2x32_split_y', a)), a),
# Byte extraction
(('ushr', a, 24), ('extract_u8', a, 3), '!options->lower_extract_byte'),
(('iand', 0xff, ('ushr', a, 16)), ('extract_u8', a, 2), '!options->lower_extract_byte'),