[x86] lower shuffle of extracts to AVX2 vperm instructions
I was trying to prevent shuffle regressions while matching more horizontal ops
and ended up here:
shuf (extract X, 0), (extract X, 4), Mask --> extract (shuf X, undef, Mask'), 0
The affected tests were added for:
https://bugs.llvm.org/show_bug.cgi?id=34380
This patch won't change the examples in the bug report itself, but we should be
able to extend this to catch more types.
Differential Revision: https://reviews.llvm.org/D56756
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351346
91177308-0d34-0410-b5e6-
96231b3b80d8
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