#define LLVM_CODEGEN_SSAREGMAP_H
#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/ADT/DenseMap.h"
namespace llvm {
class TargetRegisterClass;
class SSARegMap {
- std::vector<const TargetRegisterClass*> RegClassMap;
-
- unsigned rescale(unsigned Reg) {
- return Reg - MRegisterInfo::FirstVirtualRegister;
- }
+ DenseMap<const TargetRegisterClass*, VirtReg2IndexFunctor> RegClassMap;
+ unsigned NextRegNum;
public:
+ SSARegMap() : NextRegNum(MRegisterInfo::FirstVirtualRegister) { }
+
const TargetRegisterClass* getRegClass(unsigned Reg) {
- unsigned actualReg = rescale(Reg);
- assert(actualReg < RegClassMap.size() && "Register out of bounds");
- return RegClassMap[actualReg];
+ return RegClassMap[Reg];
}
/// createVirtualRegister - Create and return a new virtual register in the
/// function with the specified register class.
///
unsigned createVirtualRegister(const TargetRegisterClass *RegClass) {
- RegClassMap.push_back(RegClass);
- return RegClassMap.size()+MRegisterInfo::FirstVirtualRegister-1;
+ assert(RegClass && "Cannot create register without RegClass!");
+ RegClassMap.grow(NextRegNum);
+ RegClassMap[NextRegNum] = RegClass;
+ return NextRegNum++;
}
- unsigned getNumVirtualRegs() const {
- return RegClassMap.size();
+ unsigned getLastVirtReg() const {
+ return NextRegNum - 1;
}
};