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nir: Optimize mask+downcast to just downcast

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Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6330>
This commit is contained in:
Jesse Natalie
2020-05-21 15:05:08 -07:00
committed by Marge Bot
parent fd9b33d516
commit a1ed83fddd
1 changed files with 10 additions and 0 deletions
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10
src/compiler/nir/nir_opt_algebraic.py
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@@ -1604,6 +1604,16 @@ for t in ['int', 'uint', 'float']:
('ior', (xge, a, xN_max), (xge, (x2xN, a), b))), cond),
]
# Convert masking followed by signed downcast to just unsigned downcast
optimizations += [
(('i2i32', ('iand', 'a@64', 0xffffffff)), ('u2u32', a)),
(('i2i16', ('iand', 'a@32', 0xffff)), ('u2u16', a)),
(('i2i16', ('iand', 'a@64', 0xffff)), ('u2u16', a)),
(('i2i8', ('iand', 'a@16', 0xff)), ('u2u8', a)),
(('i2i8', ('iand', 'a@32', 0xff)), ('u2u8', a)),
(('i2i8', ('iand', 'a@64', 0xff)), ('u2u8', a)),
]
def fexp2i(exp, bits):
# Generate an expression which constructs value 2.0^exp or 0.0.
#