Simon Pilgrim 68224c1952 [TargetLowering] Only demand a rotation's modulo amount bits ...

ISD::ROTL/ROTR rotation values are guaranteed to act as a modulo amount, so for power-of-2 bitwidths we only need the lowest bits.

Differential Revision: https://reviews.llvm.org/D76201

2020-03-17 21:23:46 +00:00

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