X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FSimpleRegisterCoalescing.h;h=65cf542836dd5a4c18a831def84ec730a07e79db;hb=bcb8c6d09ee426e0f774e3412912f6ae9e5f78dd;hp=d24cc338e2e3f89a8504f7b83c67456e900d476f;hpb=6ff1c3f36c53d37097d1e66b58cd8d129d690127;p=oota-llvm.git diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h index d24cc338e2e..65cf542836d 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.h +++ b/lib/CodeGen/SimpleRegisterCoalescing.h @@ -21,7 +21,7 @@ namespace llvm { class SimpleRegisterCoalescing; - class LiveVariables; + class LiveDebugVariables; class TargetRegisterInfo; class TargetInstrInfo; class VirtRegMap; @@ -44,10 +44,10 @@ namespace llvm { const TargetRegisterInfo* tri_; const TargetInstrInfo* tii_; LiveIntervals *li_; + LiveDebugVariables *ldv_; const MachineLoopInfo* loopInfo; AliasAnalysis *AA; - BitVector allocatableRegs_; DenseMap allocatableRCRegs_; /// JoinedCopies - Keep track of copies eliminated due to coalescing. @@ -64,18 +64,10 @@ namespace llvm { public: static char ID; // Pass identifcation, replacement for typeid - SimpleRegisterCoalescing() : MachineFunctionPass(&ID) {} - - struct InstrSlots { - enum { - LOAD = 0, - USE = 1, - DEF = 2, - STORE = 3, - NUM = 4 - }; - }; - + SimpleRegisterCoalescing() : MachineFunctionPass(ID) { + initializeSimpleRegisterCoalescingPass(*PassRegistry::getPassRegistry()); + } + virtual void getAnalysisUsage(AnalysisUsage &AU) const; virtual void releaseMemory(); @@ -105,14 +97,11 @@ 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, - CoalescerPair &CP); + /// 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. @@ -122,8 +111,7 @@ 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. @@ -134,8 +122,7 @@ 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 @@ -146,13 +133,13 @@ namespace llvm { /// ReMaterializeTrivialDef - If the source of a copy is defined by a trivial /// computation, replace the copy by rematerialize the definition. - bool ReMaterializeTrivialDef(LiveInterval &SrcInt, unsigned DstReg, - unsigned DstSubIdx, MachineInstr *CopyMI); + /// If PreserveSrcInt is true, make sure SrcInt is valid after the call. + bool ReMaterializeTrivialDef(LiveInterval &SrcInt, bool PreserveSrcInt, + 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; + /// shouldJoinPhys - Return true if a physreg copy should be joined. + bool shouldJoinPhys(CoalescerPair &CP); /// isWinToJoinCrossClass - Return true if it's profitable to coalesce /// two virtual registers from different register classes. @@ -162,31 +149,12 @@ 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); - /// 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. @@ -203,10 +171,17 @@ 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, unsigned Reg, SlotIndex &LastUseIdx) const; + + /// markAsJoined - Remember that CopyMI has already been joined. + void markAsJoined(MachineInstr *CopyMI); }; } // End llvm namespace