-//===-- RegisterCoalescer.h - Register Coalescing Interface ------*- C++ -*-===//
+//===-- RegisterCoalescer.h - Register Coalescing Interface -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// This file contains the abstract interface for register coalescers,
+// This file contains the abstract interface for register coalescers,
// allowing them to interact with and query register allocators.
//
//===----------------------------------------------------------------------===//
/// two registers can be coalesced, CoalescerPair can determine if a copy
/// instruction would become an identity copy after coalescing.
class CoalescerPair {
- const TargetInstrInfo &tii_;
- const TargetRegisterInfo &tri_;
+ const TargetRegisterInfo &TRI;
- /// dstReg_ - The register that will be left after coalescing. It can be a
+ /// DstReg - The register that will be left after coalescing. It can be a
/// virtual or physical register.
- unsigned dstReg_;
+ unsigned DstReg;
- /// srcReg_ - the virtual register that will be coalesced into dstReg.
- unsigned srcReg_;
+ /// SrcReg - the virtual register that will be coalesced into dstReg.
+ unsigned SrcReg;
- /// subReg_ - The subregister index of srcReg in dstReg_. It is possible the
- /// coalesce srcReg_ into a subreg of the larger dstReg_ when dstReg_ is a
- /// virtual register.
- unsigned subIdx_;
+ /// DstIdx - The sub-register index of the old DstReg in the new coalesced
+ /// register.
+ unsigned DstIdx;
- /// partial_ - True when the original copy was a partial subregister copy.
- bool partial_;
+ /// SrcIdx - The sub-register index of the old SrcReg in the new coalesced
+ /// register.
+ unsigned SrcIdx;
- /// crossClass_ - True when both regs are virtual, and newRC is constrained.
- bool crossClass_;
+ /// Partial - True when the original copy was a partial subregister copy.
+ bool Partial;
- /// flipped_ - True when DstReg and SrcReg are reversed from the oriignal copy
- /// instruction.
- bool flipped_;
+ /// CrossClass - True when both regs are virtual, and newRC is constrained.
+ bool CrossClass;
- /// newRC_ - The register class of the coalesced register, or NULL if dstReg_
- /// is a physreg.
- const TargetRegisterClass *newRC_;
+ /// Flipped - True when DstReg and SrcReg are reversed from the original
+ /// copy instruction.
+ bool Flipped;
+
+ /// NewRC - The register class of the coalesced register, or NULL if DstReg
+ /// is a physreg. This register class may be a super-register of both
+ /// SrcReg and DstReg.
+ const TargetRegisterClass *NewRC;
public:
- CoalescerPair(const TargetInstrInfo &tii, const TargetRegisterInfo &tri)
- : tii_(tii), tri_(tri), dstReg_(0), srcReg_(0), subIdx_(0),
- partial_(false), crossClass_(false), flipped_(false), newRC_(0) {}
+ CoalescerPair(const TargetRegisterInfo &tri)
+ : TRI(tri), DstReg(0), SrcReg(0), DstIdx(0), SrcIdx(0),
+ Partial(false), CrossClass(false), Flipped(false), NewRC(nullptr) {}
+
+ /// Create a CoalescerPair representing a virtreg-to-physreg copy.
+ /// No need to call setRegisters().
+ CoalescerPair(unsigned VirtReg, unsigned PhysReg,
+ const TargetRegisterInfo &tri)
+ : TRI(tri), DstReg(PhysReg), SrcReg(VirtReg), DstIdx(0), SrcIdx(0),
+ Partial(false), CrossClass(false), Flipped(false), NewRC(nullptr) {}
/// setRegisters - set registers to match the copy instruction MI. Return
/// false if MI is not a coalescable copy instruction.
bool setRegisters(const MachineInstr*);
- /// flip - Swap srcReg_ and dstReg_. Return false if swapping is impossible
- /// because dstReg_ is a physical register, or subIdx_ is set.
+ /// flip - Swap SrcReg and DstReg. Return false if swapping is impossible
+ /// because DstReg is a physical register, or SubIdx is set.
bool flip();
/// isCoalescable - Return true if MI is a copy instruction that will become
bool isCoalescable(const MachineInstr*) const;
/// isPhys - Return true if DstReg is a physical register.
- bool isPhys() const { return !newRC_; }
+ bool isPhys() const { return !NewRC; }
- /// isPartial - Return true if the original copy instruction did not copy the
- /// full register, but was a subreg operation.
- bool isPartial() const { return partial_; }
+ /// isPartial - Return true if the original copy instruction did not copy
+ /// the full register, but was a subreg operation.
+ bool isPartial() const { return Partial; }
- /// isCrossClass - Return true if DstReg is virtual and NewRC is a smaller register class than DstReg's.
- bool isCrossClass() const { return crossClass_; }
+ /// isCrossClass - Return true if DstReg is virtual and NewRC is a smaller
+ /// register class than DstReg's.
+ bool isCrossClass() const { return CrossClass; }
/// isFlipped - Return true when getSrcReg is the register being defined by
/// the original copy instruction.
- bool isFlipped() const { return flipped_; }
+ bool isFlipped() const { return Flipped; }
/// getDstReg - Return the register (virtual or physical) that will remain
/// after coalescing.
- unsigned getDstReg() const { return dstReg_; }
+ unsigned getDstReg() const { return DstReg; }
/// getSrcReg - Return the virtual register that will be coalesced away.
- unsigned getSrcReg() const { return srcReg_; }
+ unsigned getSrcReg() const { return SrcReg; }
+
+ /// getDstIdx - Return the subregister index that DstReg will be coalesced
+ /// into, or 0.
+ unsigned getDstIdx() const { return DstIdx; }
- /// getSubIdx - Return the subregister index in DstReg that SrcReg will be
- /// coalesced into, or 0.
- unsigned getSubIdx() const { return subIdx_; }
+ /// getSrcIdx - Return the subregister index that SrcReg will be coalesced
+ /// into, or 0.
+ unsigned getSrcIdx() const { return SrcIdx; }
/// getNewRC - Return the register class of the coalesced register.
- const TargetRegisterClass *getNewRC() const { return newRC_; }
+ const TargetRegisterClass *getNewRC() const { return NewRC; }
};
} // End llvm namespace
projects / oota-llvm.git / blobdiff