Simon Pilgrim 2e5c533f85 [X86][AVX2] Improve sign/zero extension on AVX2 targets
Split extensions to large vectors into 256-bit chunks - the equivalent of what we do with pre-AVX2 into 128-bit chunks

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277939 91177308-0d34-0410-b5e6-96231b3b80d8
2016-08-06 21:21:12 +00:00
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2016-08-06 02:00:45 +00:00