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* [PowerPC] Exploit `vrl(b|h|w|d)` to perform vector rotationKai Luo2019-12-231-0/+136
Summary: Currently, we set legalization action of `ISD::ROTL` vectors as `Expand` in `PPCISelLowering`. However, we can exploit `vrl(b|h|w|d)` to lower `ISD::ROTL` directly. Differential Revision: https://reviews.llvm.org/D71324
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