[llvm-bugs] [Bug 34248] New: r311077 - using VPlan in loop vectorizer - generates bad IR for PPC (and probably others)

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https://bugs.llvm.org/show_bug.cgi?id=34248

            Bug ID: 34248
           Summary: r311077 - using VPlan in loop vectorizer - generates
                    bad IR for PPC (and probably others)
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: chandlerc at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19013
  --> https://bugs.llvm.org/attachment.cgi?id=19013&action=edit
reproducer

When testing LLVM with the VPlan based vectorization enabled we found lots of
issues on non-x86 architectures.

I've attached a reduced IR test case from libpng on PPC64. It assert fails
with:

% opt -disable-output -aa-pipeline=default -passes='default<O3>'
png.simplified.ll

I'm going to revert the patch while you investigate.

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