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Author SHA1 Message Date
Craig Topper 23ebd9564f [X86][InstCombine] Add support for scalar FMA intrinsics to SimplifyDemandedVectorElts. 
This teaches SimplifyDemandedElts that the FMA can be removed if the lower element isn't used. It also teaches it that if upper elements of the first operand aren't used then we can simplify them.

llvm-svn: 289377
 2016-12-11 08:54:52 +00:00
Craig Topper 7a230f4225 [X86][InstCombine] Add the test cases for r289370, r289371, and r289372. 
I forgot to add the new files before commiting.

llvm-svn: 289374
 2016-12-11 08:00:51 +00:00