commit 78d8d15e2a3e7cb5a3005433f0e54216519ce7b7
author Simon Pilgrim <llvm-dev@redking.me.uk> Mon Jan 18 20:59:04 2016 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> Mon Jan 18 20:59:04 2016 +0000
tree 9f3ad6adee1c99dd83ca714ef8763eaba8988291
parent 8eeb613a8c283bff0673f259286d0d5a3c483aa6

[X86][AVX2] Broadcast subvectors

AVX2 can only broadcast from the zero'th element of a vector, but if the broadcastable element is the zero'th element of a 128-bit subvector its advantageous to extract the subvector, broadcast from that and avoid the loading of shuffle mask data that would be needed for VPERMPS/VPERMD. The only exception being when the source type is 4f64 or 4i64 which can directly use the immediate shuffle VPERMPD/VPERMQ directly.

Differential Revision: http://reviews.llvm.org/D16050

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258081 91177308-0d34-0410-b5e6-96231b3b80d8