The patch introduces new way of narrowing complex (>UINT16 variants) solutions.
The new method introduced under "-lsr-exp-narrow" option (currenlty set to true).
Summary:
The method is based on registers number mathematical expectation and should be
generally closer to optimal solution.
Please see details in comments to
"LSRInstance::NarrowSearchSpaceByDeletingCostlyFormulas()" function
(in lib/Transforms/Scalar/LoopStrengthReduce.cpp).
Reviewers: qcolombet
Differential Revision: http://reviews.llvm.org/D29862
From: Evgeny Stupachenko <evstupac@gmail.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295704
91177308-0d34-0410-b5e6-
96231b3b80d8
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