[llvm-bugs] [Bug 31883] New: LICM spends large part of its time computing Alias info

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31883

            Bug ID: 31883
           Summary: LICM spends large part of its time computing Alias
                    info
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Keywords: slow-compile
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: dberlin at dberlin.org, llvm-bugs at lists.llvm.org,
                    simon.f.whittaker at gmail.com
    Classification: Unclassified

Created attachment 17942
  --> https://llvm.org/bugs/attachment.cgi?id=17942&action=edit
LTO profile

LICM seems to spend 90-95% of its time in AST, which is terribly O(N^2).
This slowness is exacerbated on large files or at LTO time.
See attachment.

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