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Commit 7d9084ff authored by Robert Lougher's avatar Robert Lougher
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Teach the DAGCombiner how to fold concat_vector nodes when the input is two 

BUILD_VECTOR nodes, e.g.:

(concat_vectors (BUILD_VECTOR a1, a2, a3, a4), (BUILD_VECTOR b1, b2, b3, b4))
->
(BUILD_VECTOR a1, a2, a3, a4, b1, b2, b3, b4)

This fixes an issue with AVX, where a sequence was not recognized as a 256-bit
vbroadcast due to the concat_vectors.

llvm-svn: 201158
parent 2228cd3f
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