Stanislav Mekhanoshin 747f67e034 [AMDGPU] Fix adjustWritemask subreg handling ...

If we happen to extract a non-dword subreg that breaks the
logic of the function and it may shrink the dmask because
it does not recognize the use of a lane(s).

This bug is next to impossible to trigger with the current
lowering in the BE, but it breaks in one of my future patches.

Differential Revision: https://reviews.llvm.org/D93782

2020-12-23 14:43:31 -08:00

436 KiB

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