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agx: Lower f2u8/f2i8

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The less 8-bit we need to emulate in the backend the better.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24635>
This commit is contained in:
Alyssa Rosenzweig 2023-08-11 09:58:33 -04:00 • committed by Marge Bot
parent b3ed5228b4
commit fa2a7cb2a8
1 changed files with 4 additions and 0 deletions
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4
src/asahi/compiler/agx_nir_algebraic.py
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@ -39,6 +39,10 @@ lower_pack = [
(('u2f32', ('u2u32', a)), ('u2f32', a)),
(('i2f32', ('i2i32', a)), ('i2f32', a)),
# Chew through some 8-bit before the backend has to deal with it
(('f2u8', a), ('u2u8', ('f2u16', a))),
(('f2i8', a), ('i2i8', ('f2i16', a))),
# These are based on the lowerings from nir_opt_algebraic, but conditioned
# on the number of bits not being constant. If the bit count is constant
# (the happy path) we can use our native instruction instead.