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Summary: In the case of (and reg, constant) or (or reg, constant), it can be beneficial to use a ANDNrr/ORNrr instruction instead of ANDrr/ORrr, if the complement of the constant can be encoded using a single SETHI instruction instead of a SETHI/ORri pair. If the constant has more than one use, it is probably better to keep it in its original form. Reviewers: jyknight, venkatra Reviewed By: jyknight Subscribers: fedor.sergeev, jrtc27, llvm-commits Differential Revision: https://reviews.llvm.org/D50964 llvm-svn: 341069 |
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