[llvm-bugs] [Bug 44066] New: long compile time after enabling MemorySSA as loop dependency

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44066

            Bug ID: 44066
           Summary: long compile time after enabling MemorySSA as loop
                    dependency
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Transformation Utilities
          Assignee: unassignedbugs at nondot.org
          Reporter: yuanfang.chen at sony.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22841
  --> https://bugs.llvm.org/attachment.cgi?id=22841&action=edit
bitcode reproducer

After rL370384, the compile time for an internal test increases from 12s to
~63s

clang++ -c -O3 -g -fno-vectorize -fno-slp-vectorize -fno-strict-aliasing
test.ll -x ir

Attached is a reduced reproducer that on my Intel i7-6900K takes 1.3s before
rL370384, and 2.4s after it.

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