[PATCH] Added a new transformation " (X + Y) - (X + Z) --> (Y - Z) "

[sonam kumari]

Hi dexonsmith, majnemer, suyog,

Hi All,

Submitted a patch related to subtraction optimization.

The optimization is :
(X + Y) - (X + Z) --> (Y - Z)

Please help in reviewing it.

Regards,
Sonam.

http://reviews.llvm.org/D5813

Files:
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  test/Transforms/InstCombine/sub.ll
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