[LLVMbugs] [Bug 13651] New: Dramatic Compilation slow-down on higher Optimizaitons

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Aug 20 13:11:24 PDT 2012


             Bug #: 13651
           Summary: Dramatic Compilation slow-down on higher Optimizaitons
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nbhargava at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 9079
  --> http://llvm.org/bugs/attachment.cgi?id=9079
File that exhibits problem

The attached file contains a few function definitions followed by a main method
with a single line of code duplicated 2500 times.

At optimization levels O0 and O1, the code compiles relatively quickly (~5s).
However, at optimization levels O2 and O3, the compilation time jumps to over a

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