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Sanjay Patel
d049b8952b
This is based on the example/discussion in PR37428: https://bugs.llvm.org/show_bug.cgi?id=37428 Proper vector shift instructions don't appear until AVX2, so we may generate several extra instructions within a loop trying to compensate for that. It's difficult to recover from that shift expansion later than this, so use the existing TLI hook and splat analysis to enable better codegen. This extends CGP functionality introduced with: rL201655 Differential Revision: https://reviews.llvm.org/D63233 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363511 91177308-0d34-0410-b5e6-96231b3b80d8
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