Stephen Thomas 2e3fa4ba9e [AMDGPU] Insert before and after instructions that always use GDS (#131338) ...

It is an architectural requirement that there must be no outstanding GDS
instructions when an "always GDS" instruction is issued, and also that
an always GDS instruction must be allowed to complete.

Insert waits on DScnt/LGKMcnt prior to (if necessary) and subsequent to
(unconditionally) any always GDS instruction, and an additional S_NOP if
the subsequent wait was followed by S_ENDPGM.

Always GDS instructions are GWS instructions, DS_ORDERED_COUNT,
DS_ADD_GS_REG_RTN, and DS_SUB_GS_REG_RTN (the latter two as considered
always GDS as of this patch).

2025-03-21 09:33:04 +00:00

363 KiB

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