[PATCH] [PATCH][ARM] Fix issue with UMLAL (unsigned multiple accumulate long) lowering

[Matthias Braun]

Signed and unsigned multipliciation produce the same result for the lower 32 bits. The results are only different for the upper 32 bit. So I think you can just always choose UMLAL (or always SMLAL) as your transformation only accepts cases where the multiplication doesn't produce any high bits anyway.

- Matthias


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9881

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