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* RBIT Instruction only available for ARMv6t2 and above.Weiming Zhao2016-01-081-0/+34
Summary: r255334 matches bit-reverse pattern in InstCombine and generates calls to Instrinsic::bitreverse. RBIT instruction is only available for ARMv6t2 and above. This patch has the intrinsic expanded during legalization for ARMv4 and ARMv5. Patch by Z. Zheng <zhaoshiz@codeaurora.org> Reviewers: apazos, jmolloy, weimingz Subscribers: aemerson, rengolin, llvm-commits Differential Revision: http://reviews.llvm.org/D15932 llvm-svn: 257188
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