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3957d4245f
This patch teaches the x86 backend how to efficiently lower ISD::BITCAST dag nodes from MVT::f64 to MVT::v4i16 (and vice versa), and from MVT::f64 to MVT::v8i8 (and vice versa). This patch extends the logic from revision 208107 to also handle MVT::v4i16 and MVT::v8i8. Also, this patch correctly propagates Undef values when performing the widening of a vector (example: when widening from v2i32 to v4i32, the upper 64bits of the resulting vector are 'undef'). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209451 91177308-0d34-0410-b5e6-96231b3b80d8
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