[LLVMbugs] [Bug 12330] New: Improve LoopStrengthReduction to handle nested loops.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12330

             Bug #: 12330
           Summary: Improve LoopStrengthReduction to handle nested loops.
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: atrick at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


The LSR pass currently isn't smart enough to optimize outer loops without
pessimizing inner loops. This isn't the most important optimization, but we
have noticed cases that could be improved be LSR on outer loops. I'm attaching
five unit tests that used to work back when LLVM attempted LSR on nested loops.
Maybe they can be resurrected some day.

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