Georg Lehmann
0e21cd9e15
In wave64 for hw with native wave32, ds_append seems to be split in a load for
the low half and an atomic for the high half, and other LDS instructions can
be scheduled between the two.
Which means the result of the low half is unusable because it might be out of date.
I was only able to reproduce this issue in WGP mode, but be conservative and
apply the workaround in CU mode too.
Foz-DB Navi31:
Totals from 13 (0.02% of 79395) affected shaders:
Instrs: 7599 -> 7656 (+0.75%)
CodeSize: 39708 -> 39972 (+0.66%)
Latency: 83174 -> 83572 (+0.48%)
InvThroughput: 8271 -> 8357 (+1.04%)
Copies: 718 -> 717 (-0.14%)
VALU: 3689 -> 3703 (+0.38%)
SALU: 935 -> 965 (+3.21%)
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11921
Fixes: 45e935800a ("aco: implement nir_shared_append/consume_amd")
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31301>
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