[LLVMbugs] [Bug 6186] New: hang in tail duplication compiling js_Interpret from Firefox

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sun Jan 31 00:17:11 PST 2010


           Summary: hang in tail duplication compiling js_Interpret from
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 5511

Created an attachment (id=4148)
 --> (http://llvm.org/bugs/attachment.cgi?id=4148)

Testcase attached; to reproduce, run "llc xx.bc".  A few quick backtraces seem
to pin the issue on UpdateSuccessorsPHIs in TailDuplication.cpp, but I haven't
looked closely.

This might actually be a performance issue rather than a hang, but the file
takes 2.5 seconds to compile at -O0 and at least 4 minutes to compile with

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