Kai Luo 44bd8ea167 [DAGCombine][PowerPC] Simplify nabs by using legal smin operation
Convert `0 - abs(x)` to `smin (x, -x)` if `smin` is a legal operation.

Verification: https://alive2.llvm.org/ce/z/vpquFR

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D92637
2020-12-08 03:24:07 +00:00
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