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A consequence of r347274 is that SCALAR_TO_VECTOR can be converted into BUILD_VECTOR by SimplifyDemandedBits, but LowerBUILD_VECTOR can turn BUILD_VECTOR into SCALAR_TO_VECTOR so we get an infinite loop. Fix this by making LowerBUILD_VECTOR not do this transformation for those vectors that would get transformed back, i.e. BUILD_VECTOR of a single-element constant vector. Doing that means we get a DUP, which we then need to recognise in ISel as a copy. llvm-svn: 347456 |
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