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pan/bi: Optimize pattern from nir_lower_idiv

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This takes advantage of the .i1 modifier on the comparison to get b2i32 "for
free" in typical circumstances, saving an instruction. Will help with an instr
count regression from lower_idiv.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17266>
This commit is contained in:
Alyssa Rosenzweig 2022-08-02 10:16:11 -04:00 • committed by Marge Bot
parent 1ef20f1f35
commit 35a7490ce2
1 changed files with 2 additions and 0 deletions
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src/panfrost/bifrost/bifrost_nir_algebraic.py
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@ -53,6 +53,8 @@ algebraic_late = [
(('fabs', ('fddx', a)), ('fabs', ('fddx_must_abs_mali', a))),
(('fabs', ('fddy', b)), ('fabs', ('fddy_must_abs_mali', b))),
(('b32csel', 'b@32', ('iadd', 'a@32', 1), a), ('iadd', a, ('b2i32', b))),
]
# Handling all combinations of boolean and float sizes for b2f is nontrivial.