/// registers, including vreg register classes, use/def chains for registers,
/// etc.
class MachineRegisterInfo {
-public:
- /// Register allocation hints.
- enum RegAllocHintType {
- RA_None, /// No preference
- RA_Preference, /// Prefer a particular register
- RA_PairEven, /// Even register of a register pair
- RA_PairOdd /// Odd register of a register pair
- };
-
-private:
/// VRegInfo - Information we keep for each virtual register. The entries in
/// this vector are actually converted to vreg numbers by adding the
/// TargetRegisterInfo::FirstVirtualRegister delta to their index.
std::vector<std::vector<unsigned> > RegClass2VRegMap;
/// RegAllocHints - This vector records register allocation hints for virtual
- /// registers. For each virtual register, it keeps a register and type enum
- /// pair making up the allocation hint. For example, if the hint type is
- /// RA_Specified, it means the virtual register prefers the specified physical
- /// register of the hint or the physical register allocated to the virtual
+ /// registers. For each virtual register, it keeps a register and hint type
+ /// pair making up the allocation hint. Hint type is target specific except
+ /// for the value 0 which means the second value of the pair is the preferred
+ /// register for allocation. For example, if the hint is <0, 1024>, it means
+ /// the allocator should prefer the physical register allocated to the virtual
/// register of the hint.
- std::vector<std::pair<RegAllocHintType, unsigned> > RegAllocHints;
+ std::vector<std::pair<unsigned, unsigned> > RegAllocHints;
/// PhysRegUseDefLists - This is an array of the head of the use/def list for
/// physical registers.
/// setRegAllocationHint - Specify a register allocation hint for the
/// specified virtual register.
- void setRegAllocationHint(unsigned Reg,
- RegAllocHintType Type, unsigned PrefReg) {
+ void setRegAllocationHint(unsigned Reg, unsigned Type, unsigned PrefReg) {
Reg -= TargetRegisterInfo::FirstVirtualRegister;
assert(Reg < VRegInfo.size() && "Invalid vreg!");
RegAllocHints[Reg].first = Type;
/// getRegAllocationHint - Return the register allocation hint for the
/// specified virtual register.
- std::pair<RegAllocHintType, unsigned>
+ std::pair<unsigned, unsigned>
getRegAllocationHint(unsigned Reg) const {
Reg -= TargetRegisterInfo::FirstVirtualRegister;
assert(Reg < VRegInfo.size() && "Invalid vreg!");