Sam Parker c363deb575 [ARM][ParallelDSP] Fix for sext input ...

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

2019-09-09 08:39:14 +00:00

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