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[X86][AVX] Add tests showing failure to use chained PACKSS/PACKUS for multi…

Authored by RKSimon on Apr 3 2020, 5:50 AM.

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[X86][AVX] Add tests showing failure to use chained PACKSS/PACKUS for multi-stage compaction shuffles

The sign/zero extended top bits mean that we could use chained PACK*S ops here

Details

Committed
RKSimonApr 3 2020, 6:16 AM
Parents
rGa46e7d7a5f60: [AMDGPU] Allow AGPR in inline asm
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