[LLVMbugs] [Bug 23213] New: Failure to hoist loop invariant

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23213

            Bug ID: 23213
           Summary: Failure to hoist loop invariant
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: bigcheesegs at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14196
  --> https://llvm.org/bugs/attachment.cgi?id=14196&action=edit
Original C++ Code

LLVM fails to properly optimize the attached code from Mike Acton's talk "How
to Write Code the Compiler Can Actually Optimize".

The issue is that Foo::Bar is inlined into Foo::Baz before Foo::Bar has been
optimized, and LICM/SCEV can't handle the resulting double loop.

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