[PATCH] D18230: [SimplifyLibCalls] Simplify strlen to a subtraction for certain cases

[Nuno Lopes via llvm-commits]

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Could you please explain the motivation for this transformation?
Doesn't seem very profitable to me unless strlen(s) has already been computed before. Otherwise we end up visiting more memory positions than with the original code.


http://reviews.llvm.org/D18230