Simon Pilgrim 66c960350c [DagCombiner] Generalized BuildVector Vector Concatenation
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
2015-02-22 18:17:28 +00:00
..
2015-02-21 21:29:10 +00:00