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Author SHA1 Message Date
Aaron Watry 7659157f1b Add hadd builtin 
(x + y) >> 1 gets changed to:
(x>>1) + (y>>1) + (x&y&1)

Saves us having to do any llvm assembly and overflow checking in the addition.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 188476
 2013-08-15 19:21:07 +00:00