const MachineLoopInfo* loopInfo;
AliasAnalysis *AA;
- BitVector allocatableRegs_;
DenseMap<const TargetRegisterClass*, BitVector> allocatableRCRegs_;
/// JoinedCopies - Keep track of copies eliminated due to coalescing.
public:
static char ID; // Pass identifcation, replacement for typeid
- SimpleRegisterCoalescing() : MachineFunctionPass(&ID) {}
+ SimpleRegisterCoalescing() : MachineFunctionPass(ID) {
+ initializeSimpleRegisterCoalescingPass(*PassRegistry::getPassRegistry());
+ }
struct InstrSlots {
enum {
/// the source value number is defined by a copy from the destination reg
/// see if we can merge these two destination reg valno# into a single
/// value number, eliminating a copy.
- bool AdjustCopiesBackFrom(LiveInterval &IntA, LiveInterval &IntB,
- MachineInstr *CopyMI);
+ bool AdjustCopiesBackFrom(const CoalescerPair &CP, MachineInstr *CopyMI);
/// HasOtherReachingDefs - Return true if there are definitions of IntB
/// other than BValNo val# that can reach uses of AValno val# of IntA.
/// If the source value number is defined by a commutable instruction and
/// its other operand is coalesced to the copy dest register, see if we
/// can transform the copy into a noop by commuting the definition.
- bool RemoveCopyByCommutingDef(LiveInterval &IntA, LiveInterval &IntB,
- MachineInstr *CopyMI);
+ bool RemoveCopyByCommutingDef(const CoalescerPair &CP,MachineInstr *CopyMI);
/// TrimLiveIntervalToLastUse - If there is a last use in the same basic
/// block as the copy instruction, trim the ive interval to the last use
const TargetRegisterClass *DstRC,
const TargetRegisterClass *NewRC);
- /// HasIncompatibleSubRegDefUse - If we are trying to coalesce a virtual
- /// register with a physical register, check if any of the virtual register
- /// operand is a sub-register use or def. If so, make sure it won't result
- /// in an illegal extract_subreg or insert_subreg instruction.
- bool HasIncompatibleSubRegDefUse(MachineInstr *CopyMI,
- unsigned VirtReg, unsigned PhysReg);
-
- /// CanJoinExtractSubRegToPhysReg - Return true if it's possible to coalesce
- /// an extract_subreg where dst is a physical register, e.g.
- /// cl = EXTRACT_SUBREG reg1024, 1
- bool CanJoinExtractSubRegToPhysReg(unsigned DstReg, unsigned SrcReg,
- unsigned SubIdx, unsigned &RealDstReg);
-
- /// CanJoinInsertSubRegToPhysReg - Return true if it's possible to coalesce
- /// an insert_subreg where src is a physical register, e.g.
- /// reg1024 = INSERT_SUBREG reg1024, c1, 0
- bool CanJoinInsertSubRegToPhysReg(unsigned DstReg, unsigned SrcReg,
- unsigned SubIdx, unsigned &RealDstReg);
-
/// UpdateRegDefsUses - Replace all defs and uses of SrcReg to DstReg and
/// update the subregister number if it is not zero. If DstReg is a
/// physical register and the existing subregister number of the def / use
/// it as well.
bool RemoveDeadDef(LiveInterval &li, MachineInstr *DefMI);
+ /// RemoveCopyFlag - If DstReg is no longer defined by CopyMI, clear the
+ /// VNInfo copy flag for DstReg and all aliases.
+ void RemoveCopyFlag(unsigned DstReg, const MachineInstr *CopyMI);
+
/// lastRegisterUse - Returns the last use of the specific register between
/// cycles Start and End or NULL if there are no uses.
MachineOperand *lastRegisterUse(SlotIndex Start, SlotIndex End,