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For the cases where the icmp/fcmp predicate is commutative, use reorderInputsAccordingToOpcode to collect and commute the operands. This requires a helper to recognise commutativity in both general Instruction and CmpInstr types - the CmpInst::isCommutative doesn't overload the Instruction::isCommutative method for reasons I'm not clear on (maybe because its based on predicate not opcode?!?). Differential Revision: https://reviews.llvm.org/D59992 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357266 91177308-0d34-0410-b5e6-96231b3b80d8