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nir/opt_algebraic: optimize convert_uint_sat(ulong)

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I wrote this in my query copy shader, it didn't get the codegen I expected, so I
investigated.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32208>
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Alyssa Rosenzweig 2024-11-18 14:26:15 -04:00 committed by Marge Bot
parent 07ba9335ae
commit 61862b209e
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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@ -1976,6 +1976,12 @@ optimizations.extend([
(('u2f32', ('u2u64', 'a@32')), ('u2f32', a)),
# UINT32_MAX < a just checks the high half of a 64-bit value. This occurs
# when lowering convert_uint_sat(ulong). Although the replacement is more
# instructions, it replaces a 64-bit instruction with a 32-bit instruction
# and a move that will likely be coalesced.
(('ult', 0xffffffff, 'a@64'), ('ine', ('unpack_64_2x32_split_y', a), 0)),
# Redundant trip through 8-bit
(('i2i16', ('u2u8', ('iand', 'a@16', 1))), ('iand', 'a@16', 1)),
(('u2u16', ('u2u8', ('iand', 'a@16', 1))), ('iand', 'a@16', 1)),