[all-commits] [llvm/llvm-project] c49194: [LV] Pick correct BB as insert point when fixing P...

[Florian Hahn via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: c49194969430f0ee817498a7000a979a7a0ded03
      https://github.com/llvm/llvm-project/commit/c49194969430f0ee817498a7000a979a7a0ded03
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2019-12-07 (Sat, 07 Dec 2019)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    A llvm/test/Transforms/LoopVectorize/SystemZ/predicated-first-order-recurrence.ll

  Log Message:
  -----------
  [LV] Pick correct BB as insert point when fixing PHI for FORs.

Currently we fail to pick the right insertion point when
PreviousLastPart of a first-order-recurrence is a PHI node not in the
LoopVectorBody. This can happen when PreviousLastPart is produce in a
predicated block. In that case, we should pick the insertion point in
the BB the PHI is in.

Fixes PR44020.

Reviewers: hsaito, fhahn, Ayal, dorit

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D71071