Craig Topper da79b1eecc [SelectionDAG][X86][ARM] Teach ExpandIntRes_ABS to use sra+add+xor expansion when ADDCARRY is supported. ...

Rather than using SELECT instructions, use SRA, UADDO/ADDCARRY and
XORs to expand ABS. This is the multi-part version of the sequence
we use in LegalizeDAG.

It's also the same as the Custom sequence uses for i64 on 32-bit
and i128 on 64-bit. So we can remove the X86 customization.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D87215

2020-09-07 13:15:26 -07:00

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