[llvm-commits] [PATCH] implement strncat and strncpy optimizations

[Benjamin Kramer]

This patch adds optimizations for the library functions strncpy and  
strncat to the simplify-libcalls pass.

The strcat and strncat opts share some code. I've implemented this by  
putting the common code in a method of StrCatOpt and made StrNCatOpt a  
subclass of StrCatOpt.

I've also factored out EmitMemSet from MemSetOpt so it can be reused  
by the strncpy opt.

  lib/Transforms/Scalar/SimplifyLibCalls.cpp  |  136 ++++++++++++++++++ 
+++++-----
  test/Transforms/SimplifyLibCalls/StrNCat.ll |   27 +++++
  test/Transforms/SimplifyLibCalls/StrNCpy.ll |   25 +++++
  3 files changed, 166 insertions(+), 22 deletions(-)

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