MachineRegisterInfo::MachineRegisterInfo(const TargetRegisterInfo &TRI) {
VRegInfo.reserve(256);
+ RegAllocHints.reserve(256);
+ RegClass2VRegMap.resize(TRI.getNumRegClasses()+1); // RC ID starts at 1.
UsedPhysRegs.resize(TRI.getNumRegs());
// Create the physreg use/def lists.
delete [] PhysRegUseDefLists;
}
+/// setRegClass - Set the register class of the specified virtual register.
+///
+void
+MachineRegisterInfo::setRegClass(unsigned Reg, const TargetRegisterClass *RC) {
+ unsigned VR = Reg;
+ Reg -= TargetRegisterInfo::FirstVirtualRegister;
+ assert(Reg < VRegInfo.size() && "Invalid vreg!");
+ const TargetRegisterClass *OldRC = VRegInfo[Reg].first;
+ VRegInfo[Reg].first = RC;
+
+ // Remove from old register class's vregs list. This may be slow but
+ // fortunately this operation is rarely needed.
+ std::vector<unsigned> &VRegs = RegClass2VRegMap[OldRC->getID()];
+ std::vector<unsigned>::iterator I=std::find(VRegs.begin(), VRegs.end(), VR);
+ VRegs.erase(I);
+
+ // Add to new register class's vregs list.
+ RegClass2VRegMap[RC->getID()].push_back(VR);
+}
+
+/// createVirtualRegister - Create and return a new virtual register in the
+/// function with the specified register class.
+///
+unsigned
+MachineRegisterInfo::createVirtualRegister(const TargetRegisterClass *RegClass){
+ assert(RegClass && "Cannot create register without RegClass!");
+ // Add a reg, but keep track of whether the vector reallocated or not.
+ void *ArrayBase = VRegInfo.empty() ? 0 : &VRegInfo[0];
+ VRegInfo.push_back(std::make_pair(RegClass, (MachineOperand*)0));
+ RegAllocHints.push_back(std::make_pair(0, 0));
+
+ if (!((&VRegInfo[0] == ArrayBase || VRegInfo.size() == 1)))
+ // The vector reallocated, handle this now.
+ HandleVRegListReallocation();
+ unsigned VR = getLastVirtReg();
+ RegClass2VRegMap[RegClass->getID()].push_back(VR);
+ return VR;
+}
+
/// HandleVRegListReallocation - We just added a virtual register to the
/// VRegInfo info list and it reallocated. Update the use/def lists info
/// pointers.
MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
assert(Reg-TargetRegisterInfo::FirstVirtualRegister < VRegInfo.size() &&
"Invalid vreg!");
- for (reg_iterator I = reg_begin(Reg), E = reg_end(); I != E; ++I) {
- // Since we are in SSA form, we can stop at the first definition.
- if (I.getOperand().isDef())
- return &*I;
- }
+ // Since we are in SSA form, we can use the first definition.
+ if (!def_empty(Reg))
+ return &*def_begin(Reg);
return 0;
}