diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/SimpleRegisterCoalescing.h')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/SimpleRegisterCoalescing.h | 84 |
1 files changed, 12 insertions, 72 deletions
diff --git a/contrib/llvm/lib/CodeGen/SimpleRegisterCoalescing.h b/contrib/llvm/lib/CodeGen/SimpleRegisterCoalescing.h index 1be04f3..e154da6 100644 --- a/contrib/llvm/lib/CodeGen/SimpleRegisterCoalescing.h +++ b/contrib/llvm/lib/CodeGen/SimpleRegisterCoalescing.h @@ -105,21 +105,12 @@ namespace llvm { /// possible to coalesce this interval, but it may be possible if other /// things get coalesced, then it returns true by reference in 'Again'. bool JoinCopy(CopyRec &TheCopy, bool &Again); - + /// JoinIntervals - Attempt to join these two intervals. On failure, this - /// returns false. Otherwise, if one of the intervals being joined is a - /// physreg, this method always canonicalizes DestInt to be it. The output - /// "SrcInt" will not have been modified, so we can use this information - /// below to update aliases. - bool JoinIntervals(LiveInterval &LHS, LiveInterval &RHS, bool &Swapped); - - /// SimpleJoin - Attempt to join the specified interval into this one. The - /// caller of this method must guarantee that the RHS only contains a single - /// value number and that the RHS is not defined by a copy from this - /// interval. This returns false if the intervals are not joinable, or it - /// joins them and returns true. - bool SimpleJoin(LiveInterval &LHS, LiveInterval &RHS); - + /// returns false. The output "SrcInt" will not have been modified, so we can + /// use this information below to update aliases. + bool JoinIntervals(CoalescerPair &CP); + /// Return true if the two specified registers belong to different register /// classes. The registers may be either phys or virt regs. bool differingRegisterClasses(unsigned RegA, unsigned RegB) const; @@ -128,8 +119,7 @@ namespace llvm { /// 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. @@ -140,8 +130,7 @@ namespace llvm { /// 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 @@ -155,28 +144,6 @@ namespace llvm { bool ReMaterializeTrivialDef(LiveInterval &SrcInt, unsigned DstReg, unsigned DstSubIdx, MachineInstr *CopyMI); - /// CanCoalesceWithImpDef - Returns true if the specified copy instruction - /// from an implicit def to another register can be coalesced away. - bool CanCoalesceWithImpDef(MachineInstr *CopyMI, - LiveInterval &li, LiveInterval &ImpLi) const; - - /// TurnCopiesFromValNoToImpDefs - The specified value# is defined by an - /// implicit_def and it is being removed. Turn all copies from this value# - /// into implicit_defs. - void TurnCopiesFromValNoToImpDefs(LiveInterval &li, VNInfo *VNI); - - /// isWinToJoinVRWithSrcPhysReg - Return true if it's worth while to join a - /// a virtual destination register with physical source register. - bool isWinToJoinVRWithSrcPhysReg(MachineInstr *CopyMI, - MachineBasicBlock *CopyMBB, - LiveInterval &DstInt, LiveInterval &SrcInt); - - /// isWinToJoinVRWithDstPhysReg - Return true if it's worth while to join a - /// copy from a virtual source register to a physical destination register. - bool isWinToJoinVRWithDstPhysReg(MachineInstr *CopyMI, - MachineBasicBlock *CopyMBB, - LiveInterval &DstInt, LiveInterval &SrcInt); - /// isWinToJoinCrossClass - Return true if it's profitable to coalesce /// two virtual registers from different register classes. bool isWinToJoinCrossClass(unsigned SrcReg, @@ -185,43 +152,12 @@ namespace llvm { 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); - - /// ValueLiveAt - Return true if the LiveRange pointed to by the given - /// iterator, or any subsequent range with the same value number, - /// is live at the given point. - bool ValueLiveAt(LiveInterval::iterator LRItr, LiveInterval::iterator LREnd, - SlotIndex defPoint) const; - - /// RangeIsDefinedByCopyFromReg - Return true if the specified live range of - /// the specified live interval is defined by a copy from the specified - /// register. - bool RangeIsDefinedByCopyFromReg(LiveInterval &li, LiveRange *LR, - unsigned Reg); - /// 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 /// being updated is not zero, make sure to set it to the correct physical /// subregister. - void UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg, unsigned SubIdx); + void UpdateRegDefsUses(const CoalescerPair &CP); /// ShortenDeadCopyLiveRange - Shorten a live range defined by a dead copy. /// Return true if live interval is removed. @@ -238,6 +174,10 @@ namespace llvm { /// 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, |
