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nir: add quad_ballot_agx intrinsic

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to lower quad votes in nir.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29179>
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Alyssa Rosenzweig 2024-05-06 22:19:09 -04:00 • committed by Marge Bot
parent 2912f531a7
commit 9d824bd123
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_intrinsics.py
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@ -1803,6 +1803,9 @@ intrinsic("load_fep_w_v3d", dest_comp=1, flags=[CAN_ELIMINATE, CAN_REORDER])
# Equivalent to popcount(ballot(true) & ((1 << subgroup_invocation) - 1))
system_value("active_subgroup_invocation_agx", 1)
# Like ballot() but only within a quad.
intrinsic("quad_ballot_agx", src_comp=[1], dest_comp=1, flags=[CAN_ELIMINATE])
# With [0, 1] clipping, no transform is needed on the output z' = z. But with [-1,
# 1] clipping, we need to transform z' = (z + w) / 2. We express both cases as a
# lerp between z and w, where this is the lerp coefficient: 0 for [0, 1] and 0.5