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nir,zink: Make lower_discard_if a common pass

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This pass (lowering discard_if to control flow and unconditional
discard) was originally written for Zink, but is useful for hardware
that lacks conditional discard instructions like AGX. In theory AGX
could implement a conditional discard with CSEL, but the vendor
compiler uses a lowering like this one. Since I like not writing code,
I'd like to use the pass that's already in tree.

v2: Don't preserve dominance (Jason). Assert we don't see demotes or
terminates (Jason). Add Mike's ack.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14217>
This commit is contained in:
Alyssa Rosenzweig
2021-12-14 15:59:45 -05:00
committed by Marge Bot
parent 538356e3e6
commit aaf00a1b4d
4 changed files with 107 additions and 74 deletions
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1
src/compiler/nir/meson.build
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@@ -143,6 +143,7 @@ files_libnir = files(
'nir_lower_clip_halfz.c',
'nir_lower_convert_alu_types.c',
'nir_lower_variable_initializers.c',
'nir_lower_discard_if.c',
'nir_lower_discard_or_demote.c',
'nir_lower_double_ops.c',
'nir_lower_drawpixels.c',