diff options
Diffstat (limited to 'include/llvm/CodeGen/MachineRegisterInfo.h')
-rw-r--r-- | include/llvm/CodeGen/MachineRegisterInfo.h | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h index 91d24dd0fc..a5bc7f7d39 100644 --- a/include/llvm/CodeGen/MachineRegisterInfo.h +++ b/include/llvm/CodeGen/MachineRegisterInfo.h @@ -95,9 +95,6 @@ class MachineRegisterInfo { /// started. BitVector ReservedRegs; - /// AllocatableRegs - From TRI->getAllocatableSet. - mutable BitVector AllocatableRegs; - /// LiveIns/LiveOuts - Keep track of the physical registers that are /// livein/liveout of the function. Live in values are typically arguments in /// registers, live out values are typically return values in registers. @@ -427,6 +424,34 @@ public: return !reservedRegsFrozen() || ReservedRegs.test(PhysReg); } + /// getReservedRegs - Returns a reference to the frozen set of reserved + /// registers. This method should always be preferred to calling + /// TRI::getReservedRegs() when possible. + const BitVector &getReservedRegs() const { + assert(reservedRegsFrozen() && + "Reserved registers haven't been frozen yet. " + "Use TRI::getReservedRegs()."); + return ReservedRegs; + } + + /// isReserved - Returns true when PhysReg is a reserved register. + /// + /// Reserved registers may belong to an allocatable register class, but the + /// target has explicitly requested that they are not used. + /// + bool isReserved(unsigned PhysReg) const { + return getReservedRegs().test(PhysReg); + } + + /// isAllocatable - Returns true when PhysReg belongs to an allocatable + /// register class and it hasn't been reserved. + /// + /// Allocatable registers may show up in the allocation order of some virtual + /// register, so a register allocator needs to track its liveness and + /// availability. + bool isAllocatable(unsigned PhysReg) const { + return TRI->isInAllocatableClass(PhysReg) && !isReserved(PhysReg); + } //===--------------------------------------------------------------------===// // LiveIn/LiveOut Management |