[LLVMbugs] [Bug 5888] New: Huge slowdown regression

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5888

           Summary: Huge slowdown regression
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: preprocessor
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: abramobagnara at tin.it
                CC: llvmbugs at cs.uiuc.edu


Tracking a slowdown observed after a clang update, I've bisected the
problem to commit r91449.

r91448:
$ ~/llvm_opt/Release/bin/clang -w -fsyntax-only gcc.c

real    0m3.683s
user    0m3.354s
sys     0m0.325s

r91449:
$ time ~/llvm_opt/Release/bin/clang -w -fsyntax-only gcc.c

real    0m38.764s
user    0m38.378s
sys     0m0.374s

The very large source file gcc.c (22 MB) is from:

http://people.csail.mit.edu/smcc/projects/single-file-programs/


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