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nir/algebraic: fix shfr optimization with zero src2

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Fixes: 08903bbe89 ("nir: add mqsad_4x8, shfr and nir_opt_mqsad")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31808>
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Rhys Perry 2024-10-23 17:50:42 +01:00 • committed by Marge Bot
parent b2abd3bdba
commit 8efc765a3d
1 changed files with 3 additions and 1 deletions
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4
src/compiler/nir/nir_opt_algebraic.py
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@ -1490,7 +1490,9 @@ optimizations.extend([
(('ior', ('ishl', 'b@32', 24), ('ushr', a, 8)), ('shfr', b, a, 8), 'options->has_shfr32'),
(('ior', ('ishl', 'b@32', 16), ('extract_u16', a, 1)), ('shfr', b, a, 16), 'options->has_shfr32'),
(('ior', ('ishl', 'b@32', 8), ('extract_u8', a, 3)), ('shfr', b, a, 24), 'options->has_shfr32'),
(('ior', ('ishl', 'b@32', ('iadd', 32, ('ineg', c))), ('ushr@32', a, c)), ('shfr', b, a, c), 'options->has_shfr32'),
(('bcsel', ('ieq', c, 0), a, ('ior', ('ishl', 'b@32', ('iadd', 32, ('ineg', c))), ('ushr@32', a, c))), ('shfr', b, a, c), 'options->has_shfr32'),
(('bcsel', ('ine', c, 0), ('ior', ('ishl', 'b@32', ('iadd', 32, ('ineg', c))), ('ushr@32', a, c)), a), ('shfr', b, a, c), 'options->has_shfr32'),
(('ior', ('ishl', 'a@32', ('iadd', 32, ('ineg', b))), ('ushr@32', a, b)), ('shfr', a, a, b), 'options->has_shfr32 && !options->has_rotate32'),
# bfi(X, a, b) = (b & ~X) | (a & X)
# If X = ~0: (b & 0) | (a & 0xffffffff) = a