[LLVMbugs] [Bug 16365] New: Extremely slow compilation in -O1 and -O2

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Jun 18 15:42:13 PDT 2013


            Bug ID: 16365
           Summary: Extremely slow compilation in -O1 and -O2
           Product: clang
           Version: 3.2
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Fons.Rademakers at cern.ch
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10703
  --> http://llvm.org/bugs/attachment.cgi?id=10703&action=edit
source file showing problem.

Very slow compilation of large but very simple source file.

$ time clang++ -O2 -c biggraph.C

real    1m21.025s
user    1m19.286s
sys    0m1.734s

$ time g++-4 -O2 -c biggraph.C   [ g++ 4.8.1]

real    0m9.375s
user    0m9.191s
sys    0m0.176s

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