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nir/algebraic: Add some extract optimizations

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These help quite a bit when vectored versions of SpvOpSDotKHR and
friends are emitted as packed versions and then lowered.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12142>
This commit is contained in:
Ian Romanick
2021-08-19 17:52:54 -07:00
committed by Marge Bot
parent 839495efc6
commit a6db40605e
1 changed files with 14 additions and 0 deletions
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src/compiler/nir/nir_opt_algebraic.py
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@@ -1422,6 +1422,15 @@ optimizations.extend([
(('iadd', ('pack_half_2x16_split', a, 0), ('pack_half_2x16_split', 0, b)), ('pack_half_2x16_split', a, b)),
(('ior', ('pack_half_2x16_split', a, 0), ('pack_half_2x16_split', 0, b)), ('pack_half_2x16_split', a, b)),
(('extract_i8', ('pack_32_4x8_split', a, b, c, d), 0), ('i2i', a)),
(('extract_i8', ('pack_32_4x8_split', a, b, c, d), 1), ('i2i', b)),
(('extract_i8', ('pack_32_4x8_split', a, b, c, d), 2), ('i2i', c)),
(('extract_i8', ('pack_32_4x8_split', a, b, c, d), 3), ('i2i', d)),
(('extract_u8', ('pack_32_4x8_split', a, b, c, d), 0), ('u2u', a)),
(('extract_u8', ('pack_32_4x8_split', a, b, c, d), 1), ('u2u', b)),
(('extract_u8', ('pack_32_4x8_split', a, b, c, d), 2), ('u2u', c)),
(('extract_u8', ('pack_32_4x8_split', a, b, c, d), 3), ('u2u', d)),
])
# After the ('extract_u8', a, 0) pattern, above, triggers, there will be
@@ -2531,6 +2540,11 @@ late_optimizations = [
(('ishr', a, 0), a),
(('ishr', a, -32), a),
(('ushr', a, 0), a),
(('extract_i8', ('extract_i8', a, b), 0), ('extract_i8', a, b)),
(('extract_i8', ('extract_u8', a, b), 0), ('extract_i8', a, b)),
(('extract_u8', ('extract_i8', a, b), 0), ('extract_u8', a, b)),
(('extract_u8', ('extract_u8', a, b), 0), ('extract_u8', a, b)),
]
# A few more extract cases we'd rather leave late