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7cd5180574
The bug happens when the DAGCombiner attempts to optimize one of the patterns of the SUB opcode. It tries to create a zero of type v2i64. This type is legal on 32bit machines, but the initializer of this vector (i64) is target dependent. Currently, the initializer attempts to create an i64 zero constant, which fails. Added a flag to tell the DAGCombiner to create a legal zero, if we require that the pass would generate legal types. llvm-svn: 125391
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