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13a771a2a7
This patch prevents phi-node-elimination from generating a COPY operation for the register defined by t2WhileLoopStartLR, as it is a terminator that defines a value. This happens because of the presence of phi-nodes in the loop body (the Preheader of which is the block containing the t2WhileLoopStartLR). If this is not done, the COPY is generated above/before the terminator (t2WhileLoopStartLR here), and since it uses the value defined by t2WhileLoopStartLR, MachineVerifier throws a 'use before define' error. This essentially adds on to the change in differential D91887/D97729. Differential Revision: https://reviews.llvm.org/D100376 |
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