[LLVMbugs] [Bug 95] New: [lowerswitches] Lower switches is absurdly slow

[bugzilla-daemon at zion.cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=95

           Summary: [lowerswitches] Lower switches is absurdly slow
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: sabre at nondot.org
        ReportedBy: sabre at nondot.org


The lowerswitches pass is taking 16s on Zion to run on the 253.perlbmk
benchmark.  This is crazy, because the entire runtime of LLC is 29s, including
bytecode loading and the entire code generator.  Fixing this performance problem
will also speed up the JIT a LOT on this benchmark, because the JIT gets invoked
over and over again as the benchmark runs.

I'm probably not going to get a chance to look into this until after the 15th,
so if anyone wants to dig into it, please feel free. :)

-Chris



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