SIInsertWaitcnts inserts waitcnt instructions to resolve data
dependencies. The GFX10+ vscnt (VMEM store count) counter is never used
in this way. It is only used to resolve memory dependencies, and that is
handled by SIMemoryLegalizer. Hence there is no need to conservatively
wait for vscnt to be 0 on function entry and before returns.
Differential Revision: https://reviews.llvm.org/D153537
Following up on the removal of BufferPSV in commit 43b86bf992 ("AMDGPU:
Remove BufferPseudoSourceValue")
It is unclear what exactly the right address space for images should be.
They seem morally closest to buffers, so that's what I went with. In
practical terms, address space 7 is better than address space 0 because
it can't alias with LDS.
Differential Revision: https://reviews.llvm.org/D138949
bvh should be handled separately from vmem and vmem with sampler instructions
for waitcnt handling.
Differential Revision: https://reviews.llvm.org/D114794
In-order bvh instructions don't require a waitcnt as order is
guaranteed.
However, waitcnt IS required for other image instruction types vs
bvh.
Pre-commit test for new functionality in https://reviews.llvm.org/D114794
Differential Revision: https://reviews.llvm.org/D114792
