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3 Commits

Author SHA1 Message Date
Sanjay Patel 7a05641fa8 [InstCombine] remove unnecessary shuffle undef folding 
Add a test for constant folding to show that 
(shuffle undef, undef, mask)
should already be handled via instsimplify.

llvm-svn: 340926
 2018-08-29 13:24:34 +00:00
Sanjay Patel 3ce999fa41 [ConstantFolding] improve folding of binops with vector undef operand 
A non-undef operand may still have undef constant elements, 
so we should always propagate the vector results per-lane.

llvm-svn: 340194
 2018-08-20 18:19:02 +00:00
Sanjay Patel 7ff7bd9b3c [ConstantFolding] add tests for binops on vectors with undef elements; NFC 
llvm-svn: 340190
 2018-08-20 17:31:34 +00:00