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The CONCAT_VECTORS combiner pass can transform the concat of two BUILD_VECTOR nodes into a single BUILD_VECTOR node. This patch generalises this to support any number of BUILD_VECTOR nodes, and also permits UNDEF nodes to be included as well. This was noticed as AVX vec128 -> vec256 canonicalization sometimes creates a CONCAT_VECTOR with a real vec128 lower and an vec128 UNDEF upper. Differential Revision: http://reviews.llvm.org/D7816 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230177 91177308-0d34-0410-b5e6-96231b3b80d8 |
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