[LLVMbugs] [Bug 1178] NEW: Sometimes AsmPrinter::PrintSpecial assigns the same uid for two Machine Instructions

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1178

           Summary: Sometimes AsmPrinter::PrintSpecial assigns the same uid
                    for two Machine Instructions
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: lauro.venancio at gmail.com


The code:
void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
  [...]
  } else if (!strcmp(Code, "uid")) {
    // Assign a unique ID to this machine instruction.
    static const MachineInstr *LastMI = 0;
    static unsigned Counter = 0U-1;
    // If this is a new machine instruction, bump the counter.
    if (LastMI != MI) { ++Counter; LastMI = MI; }
    O << Counter;
  } else {
  [...]
}
**************************
Comparison (LastMI != MI) is incorrect. Machine Instructions of different
Machine Functions can have the same address.



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