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* [ARM][ParallelDSP] Fix for sext inputSam Parker2019-09-091-0/+186
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 llvm-svn: 371370
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