#ifndef LLVM_CODEGEN_REGISTER_SCAVENGING_H
#define LLVM_CODEGEN_REGISTER_SCAVENGING_H
-#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/ADT/BitVector.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
namespace llvm {
///
BitVector CalleeSavedRegs;
- /// ReservedRegs - A bitvector of reserved registers.
- ///
- BitVector ReservedRegs;
-
/// RegsAvailable - The current state of all the physical registers immediately
/// before MBBI. One bit per physical register. If bit is set that means it's
/// available, unset means the register is currently being used.
void setUsed(unsigned Reg);
private:
/// isReserved - Returns true if a register is reserved. It is never "unused".
- bool isReserved(unsigned Reg) const { return ReservedRegs.test(Reg); }
+ bool isReserved(unsigned Reg) const { return MRI->isReserved(Reg); }
- /// isUsed / isUnused - Test if a register is currently being used.
+ /// isUsed - Test if a register is currently being used. When called by the
+ /// isAliasUsed function, we only check isReserved if this is the original
+ /// register, not an alias register.
///
- bool isUsed(unsigned Reg) const { return !RegsAvailable.test(Reg); }
- bool isUnused(unsigned Reg) const { return RegsAvailable.test(Reg); }
+ bool isUsed(unsigned Reg, bool CheckReserved = true) const {
+ return !RegsAvailable.test(Reg) || (CheckReserved && isReserved(Reg));
+ }
/// isAliasUsed - Is Reg or an alias currently in use?
bool isAliasUsed(unsigned Reg) const;