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[X86][SSE] Add PACKSS with zero shuffle masks.

Description

[X86][SSE] Add PACKSS with zero shuffle masks.

This is an example of expansion due to D61129 - it should combine back to a PACKSS with a zero operand.

Details

Committed
RKSimonJul 15 2019, 8:43 AM
Parents
rL366076: fix unnamed fiefield issue and add tests for __builtin_preserve_access_index…
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