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clang-p2996/llvm/test/Transforms/LoopVectorize
David Sherwood c42bb30b9e [LoopVectorize] Permit fixed-width epilogue loops for scalable vector bodies
At the moment in LoopVectorizationCostModel::selectEpilogueVectorizationFactor
we bail out if the main vector loop uses a scalable VF. This patch adds
support for generating epilogue vector loops using a fixed-width VF when the
main vector loop uses a scalable VF.

I've changed LoopVectorizationCostModel::selectEpilogueVectorizationFactor
so that we convert the scalable VF into a fixed-width VF and do profitability
checks on that instead. In addition, since the scalable and fixed-width VFs
live in different VPlans that means I had to change the calls to
LVP.hasPlanWithVFs so that we only pass in the fixed-width VF.

New tests added here:

  Transforms/LoopVectorize/AArch64/sve-epilog-vect.ll

Differential Revision: https://reviews.llvm.org/D109432
2021-11-08 09:41:13 +00:00
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