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Summary: Sandy Bridge and later CPUs have better throughput using a SHLD to implement rotate versus the normal rotate instructions. Additionally it saves one uop and avoids a partial flag update dependency. This patch implements this change on any Sandy Bridge or later processor without BMI2 instructions. With BMI2 we will use RORX as we currently do. Reviewers: zvi Reviewed By: zvi Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D30181 llvm-svn: 295697
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