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The incoming accumulator value can be discovered through a sext, in which case there will be a mismatch between the input and the result. So sign extend the accumulator input if we're performing a 64-bit mac. Differential Revision: https://reviews.llvm.org/D67220 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371370 91177308-0d34-0410-b5e6-96231b3b80d8