[PATCH] Optimize memcmp(x, y, n)==0 for small n and suitably aligned x/y.

[Eelis]

I don't think this code should be committed yet, because it does not yet check whether the integer types are available. I tried doing it with:

  if (DL && DL->isLegalInteger(Len * 8) && ...

.. but that doesn't work (and the tests fail) because DL is nullptr.


http://reviews.llvm.org/D6952

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