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Author SHA1 Message Date
Andrea Di Biagio 23df4e4a2d Teach the DAGCombiner how to fold 'vselect' dag nodes according 
to the following two rules:
  1) fold (vselect (build_vector AllOnes), A, B) -> A
  2) fold (vselect (build_vector AllZeros), A, B) -> B

llvm-svn: 198777
 2014-01-08 18:33:04 +00:00
Cameron McInally c5f420e129 Suppress '(x < y) ? a : 0 -> (x < y) & a' transform on X86 architectures with dedicated mask registers. 
Patch by Aleksey Bader.

llvm-svn: 196386
 2013-12-04 14:52:33 +00:00