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nir/algebraic: optimize open-coded fmulz/ffmaz

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This pattern will be found in future versions of D3D9 DXVK.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13436>
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Rhys Perry 2021-10-01 11:27:00 +01:00 • committed by Marge Bot
parent 312a284980
commit f2fbba7920
1 changed files with 13 additions and 0 deletions
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13
src/compiler/nir/nir_opt_algebraic.py
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@ -238,6 +238,19 @@ optimizations = [
(('sudot_4x8_iadd_sat', '#a', '#b', 'c(is_not_const)'), ('iadd_sat', ('sudot_4x8_iadd', a, b, 0), c), '!options->lower_iadd_sat'),
(('sdot_2x16_iadd_sat', '#a', '#b', 'c(is_not_const)'), ('iadd_sat', ('sdot_2x16_iadd', a, b, 0), c), '!options->lower_iadd_sat'),
(('udot_2x16_uadd_sat', '#a', '#b', 'c(is_not_const)'), ('uadd_sat', ('udot_2x16_uadd', a, b, 0), c), '!options->lower_uadd_sat'),
# Optimize open-coded fmulz.
# (b==0.0 ? 0.0 : a) * (a==0.0 ? 0.0 : b) -> fmulz(a, b)
(('fmul@32', ('bcsel', ignore_exact('feq', b, 0.0), 0.0, a), ('bcsel', ignore_exact('feq', a, 0.0), 0.0, b)),
('fmulz', a, b), 'options->has_fmulz && !'+signed_zero_inf_nan_preserve_32),
(('fmul@32', a, ('bcsel', ignore_exact('feq', a, 0.0), 0.0, '#b(is_not_const_zero)')),
('fmulz', a, b), 'options->has_fmulz && !'+signed_zero_inf_nan_preserve_32),
# ffma(b==0.0 ? 0.0 : a, a==0.0 ? 0.0 : b, c) -> ffmaz(a, b, c)
(('ffma@32', ('bcsel', ignore_exact('feq', b, 0.0), 0.0, a), ('bcsel', ignore_exact('feq', a, 0.0), 0.0, b), c),
('ffmaz', a, b, c), 'options->has_fmulz && !'+signed_zero_inf_nan_preserve_32),
(('ffma@32', a, ('bcsel', ignore_exact('feq', a, 0.0), 0.0, '#b(is_not_const_zero)'), c),
('ffmaz', a, b, c), 'options->has_fmulz && !'+signed_zero_inf_nan_preserve_32),
]
# Shorthand for the expansion of just the dot product part of the [iu]dp4a