Jay Foad b59d8d7c72 [AMDGPU][GlobalISel] Compute known bits for zero-extending loads ...

Implement computeKnownBitsForTargetInstr for G_AMDGPU_BUFFER_LOAD_UBYTE
and G_AMDGPU_BUFFER_LOAD_USHORT. This allows generic combines to remove
some unnecessary G_ANDs.

Differential Revision: https://reviews.llvm.org/D89316

2020-10-13 16:22:00 +01:00

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