Craig Topper fe50be12c8 [LegalizeIntegerTypes] Further improve ExpandIntRes_SADDSUBO for targets where SADDO/SSUBO aren't supported.
Rather than converting 3 signbits to bools and comparing them,
we can do bitwise logic on the whole vector and convert the
resulting sign bit to a bool at the end.

This is still a different algorithm than what we do in LegalizeDAG
through expandSADDOSSUBO. That algorithm needs to know that the
RHS of SSUBO is > 0, but that's costly when the type is split.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D97325
2021-02-24 10:05:38 -08:00
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