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

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Dec 26 11:49:42 PST 2009


           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.

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

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

$ 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:


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