Carl Ritson a3646ec1bc [AMDGPU] Add pseudo wavemode to optimize strict_wqm ...

Strict WQM does not require a WQM transistion if it occurs within
an existing WQM section.
This occurs heavily in GFX11 pixel shaders with LDS_PARAM_LOAD.
Which leads to unnecessary EXEC mask manipulation.

To avoid these transitions, detect WQM -> Strict WQM -> WQM
and substitute new ENTER_PSEUDO_WM/EXIT_PSEUDO_WM markers instead.
These are treat similarly by WWM register pre-allocation pass,
but do not manipulate EXEC or use registers to save EXEC state.

Reviewed By: piotr

Differential Revision: https://reviews.llvm.org/D136813

2022-10-28 09:45:17 +09:00

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