Matt Arsenault 39f8a792f0 AMDGPU: Try to eliminate clearing of high bits of 16-bit instructions ...

These used to consistently be zeroed pre-gfx9, but gfx9 made the
situation complicated since now some still do and some don't. This
also manages to pick up a few cases that the pattern fails to optimize
away.

We handle some cases with instruction patterns, but some get
through. In particular this improves the integer cases.

2021-06-22 13:42:49 -04:00

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