[llvm-bugs] [Bug 39640] New: MachineOperand TargetFlags truncation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39640

            Bug ID: 39640
           Summary: MachineOperand TargetFlags truncation
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: marksl at synopsys.com
                CC: llvm-bugs at lists.llvm.org

/// Subregister number for MO_Register.  A value of 0 indicates the
  /// MO_Register has no subReg.
  ///
  /// For all other kinds of operands, this field holds target-specific flags.
  unsigned SubReg_TargetFlags : 12;

We have 12 bits for the field but are using "unsigned char" for setter values:

  /// Replace this operand with a target index.
  void ChangeToTargetIndex(unsigned Idx, int64_t Offset,
                           unsigned char TargetFlags = 0);

  static MachineOperand CreateMBB(MachineBasicBlock *MBB,
                                  unsigned char TargetFlags = 0) {


  static MachineOperand CreateCPI(unsigned Idx, int Offset,
                                  unsigned char TargetFlags = 0) {


  static MachineOperand CreateTargetIndex(unsigned Idx, int64_t Offset,
                                          unsigned char TargetFlags = 0) {

And so forth

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