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Author SHA1 Message Date
Sanjay Patel dc185ee275 [InstCombine] fix/enhance fadd/fsub factorization 
(X * Z) + (Y * Z) --> (X + Y) * Z
  (X * Z) - (Y * Z) --> (X - Y) * Z
  (X / Z) + (Y / Z) --> (X + Y) / Z
  (X / Z) - (Y / Z) --> (X - Y) / Z

The existing code that implemented these folds failed to 
optimize vectors, and it transformed code with multiple 
uses when it should not have.

llvm-svn: 339519
 2018-08-12 15:48:26 +00:00
Sanjay Patel ce104b6c16 [InstCombine] move/add tests for fadd/fsub factorization; NFC 
llvm-svn: 339518
 2018-08-12 15:06:15 +00:00