Compute the static register class constraint for operand OpIdx. For normal instructions, this is derived from the MCInstrDesc. For inline assembly it is derived from the flag words.
Declared in <llvm/CodeGen/MachineInstr.h>
TargetRegisterClass const*
getRegClassConstraint(
unsigned int OpIdx,
TargetInstrInfo const* TII,
TargetRegisterInfo const* TRI) const;Returns NULL if the static register class constraint cannot be determined.
| Name | Description |
|---|---|
| TII | TargetInstrInfo - Interface to description of machine instruction set |
| TRI | TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDesc objects that represent all of the machine registers that the target has. As such, we simply have to track a pointer to this array so that we can turn register number into a register descriptor. |