diff options
Diffstat (limited to 'lib/CodeGen/SimpleRegisterCoalescing.h')
-rw-r--r-- | lib/CodeGen/SimpleRegisterCoalescing.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h index 453760a..7823ba0 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.h +++ b/lib/CodeGen/SimpleRegisterCoalescing.h @@ -196,9 +196,25 @@ namespace llvm { MachineBasicBlock *MBB, unsigned DstReg, unsigned SrcReg); - /// isBackEdgeCopy - Returns true if CopyMI is a back edge copy. + /// 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; + + /// RemoveCopiesFromValNo - The specified value# is defined by an implicit + /// def and it is being removed. Turn all copies from this value# into + /// identity copies so they will be removed. + void RemoveCopiesFromValNo(LiveInterval &li, VNInfo *VNI); + + /// 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); + + /// isBackEdgeCopy - Return true if CopyMI is a back edge copy. /// - bool isBackEdgeCopy(MachineInstr *CopyMI, unsigned DstReg); + bool isBackEdgeCopy(MachineInstr *CopyMI, unsigned DstReg) const; /// UpdateRegDefsUses - Replace all defs and uses of SrcReg to DstReg and /// update the subregister number if it is not zero. If DstReg is a @@ -207,6 +223,8 @@ namespace llvm { /// subregister. void UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg, unsigned SubIdx); + void RemoveDeadImpDef(unsigned Reg, LiveInterval &LI); + /// RemoveUnnecessaryKills - Remove kill markers that are no longer accurate /// due to live range lengthening as the result of coalescing. void RemoveUnnecessaryKills(unsigned Reg, LiveInterval &LI); |