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agx: Preload vertex/instance ID only at start

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This means we don't reserve the registers, which improves RA
considerably. Using a special preload psuedo-op instead of a regular
move allows us to constrain semantics and gaurantee coalescing.

shader-db on glmark2 subset:

total instructions in shared programs: 6448 -> 6442 (-0.09%)
instructions in affected programs: 230 -> 224 (-2.61%)
helped: 4
HURT: 0

total bytes in shared programs: 42232 -> 42196 (-0.09%)
bytes in affected programs: 1530 -> 1494 (-2.35%)
helped: 4
HURT: 0

total halfregs in shared programs: 2291 -> 1926 (-15.93%)
halfregs in affected programs: 2185 -> 1820 (-16.70%)
helped: 75
HURT: 0

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18804>
This commit is contained in:
Alyssa Rosenzweig
2022-09-23 17:27:43 -04:00
committed by Marge Bot
parent f665229d77
commit c9a96d4615
5 changed files with 111 additions and 18 deletions
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4
src/asahi/compiler/agx_opcodes.py
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@@ -281,3 +281,7 @@ op("split", _, srcs = 1, dests = VARIABLE)
op("phi", _, srcs = VARIABLE)
op("unit_test", _, dests = 0, srcs = 1, can_eliminate = False)
# Like mov, but takes a register and can only appear at the start. Gauranteed
# to be coalesced during RA, rather than lowered to a real move.
op("preload", _, srcs = 1)