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

[Eelis]

Ah, it wasn't that DL was null, but rather that there were no native integer types specified in the target datalayout for the test. I've added those, and I've also refined the alignment check to take the integer type's preferred alignment into account.

I think it's okay to commit now. Chad: I don't have commit rights, so yes please! Thanks :)


http://reviews.llvm.org/D6952

Files:
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/memcmp-1.ll

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