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pan/bi: Lower {i,u}{min,max} instructions 

There's no native integer min/min instruction on Bifrost, lower those
to a cmp+bcsel pair.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7314>
This commit is contained in:
Boris Brezillon 2020-10-18 21:52:25 +02:00
parent 1c8b8e3c82
commit f77bbc9236
1 changed files with 8 additions and 0 deletions
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8
src/panfrost/bifrost/bifrost_nir_algebraic.py
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@ -42,6 +42,14 @@ for isz in ('8', '16', '32'):
for osz in ('16', '32', '64'):
algebraic_late += [(('b2f' + osz, 'a@' + isz), ('b' + isz + 'csel', a, 1.0, 0.0))]
# There's no native integer min/max instruction, lower those to cmp+bcsel
for sz in ('8', '16', '32'):
for t in ('i', 'u'):
algebraic_late += [
((t + 'min', 'a@' + sz, 'b@' + sz), ('b' + sz + 'csel', (t + 'lt' + sz, a, b), a, b)),
((t + 'max', 'a@' + sz, 'b@' + sz), ('b' + sz + 'csel', (t + 'lt' + sz, b, a), a, b))
]
# Midgard is able to type convert down by only one "step" per instruction; if
# NIR wants more than one step, we need to break up into multiple instructions