Jay Foad 4db7422771 [AMDGPU] Improve zeroesHigh16BitsOfDest for GFX9 legacy opcodes ...

Pseudos like V_MAD_U16 and V_FMA_F16 map down to what GFX9 calls
v_mad_legacy_u16 and v_fma_legacy_f16, which are documented to have the
same zeroing behaviour as on GFX8.

Differential Revision: https://reviews.llvm.org/D115729

2021-12-15 13:14:48 +00:00

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