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Chain is initially set to the chain operand of store node, when it reaches load, if it matches the load then Chain is set to the chain operand of the load. However, if the matching code that follows this fails, isel moves on to the next pattern but it does not restore Chain to the chain operand of the store. So when it tries to match the next store / op / load pattern it would fail on the Chain == load.getOperand(0) test. The solution is for each chain operand to get a unique name. e.g. Chain10. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25931 91177308-0d34-0410-b5e6-96231b3b80d8
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