forked from OSchip/llvm-project
8d7e73effe
Unary shuffles such as <0,2,4,6,8,10,12,14> or <1,3,5,7,9,11,13,15> where half the elements are returned, can be lowered using vnsrl. SelectionDAGBuilder lowers such shuffles as a build_vector of extract_elements since the mask has less elements than the source. To fix this, I've enable the extractSubvectorIsCheapHook to allow DAGCombine to rebuild the shuffle using 2 extract_subvectors preceding the shufffle. I've gone very conservative on extractSubvectorIsCheapHook to minimize test impact and match what we have test coverage for. This can be improved in the future. Reviewed By: reames Differential Revision: https://reviews.llvm.org/D133736 |
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