[PATCH] Added a new transformation " (sub (or A, B) (and A, B)) --> (xor A, B) "

[sonam kumari]

Hi suyog, majnemer, dexonsmith,

Hi All,

The patch does the following transformation :

(sub (or A, B) (and A, B)) --> (xor A, B)

Z3 Link : http://rise4fun.com/Z3/oeyxv

Please help in reviewing it.

Regards,
Sonam.

http://reviews.llvm.org/D5720

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