Simon Pilgrim 9c86c5e8ad [DAG] Legalize abs(x) -> umin(x,sub(0,x)) iff umin/sub are legal ...

If umin() is legal, this is likely to result in smaller codegen expansion for abs(x) than the xor(add,ashr) method.

Followup to D92095

Alive2: https://alive2.llvm.org/ce/z/8nuX6s  https://alive2.llvm.org/ce/z/q2hB9w

2020-11-25 18:06:02 +00:00

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