[LV] Fix insertion point for shuffle vectors in first order recurrence
Summary:
In first order recurrence vectorization, when the previous value is a phi node, we need to
set the insertion point to the first non-phi node.
We can have the previous value being a phi node, due to the generation of new
IVs as part of trunc optimization [1].
[1] https://reviews.llvm.org/rL294967
Reviewers: mssimpso, mkuper
Subscribers: mzolotukhin, llvm-commits
Differential Revision: https://reviews.llvm.org/D32969
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302532 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed