diff options
Diffstat (limited to 'include/llvm/Target/TargetInstrInfo.h')
| -rw-r--r-- | include/llvm/Target/TargetInstrInfo.h | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h index da30ab8..d7cc1cf 100644 --- a/include/llvm/Target/TargetInstrInfo.h +++ b/include/llvm/Target/TargetInstrInfo.h @@ -459,6 +459,13 @@ public: } /// copyPhysReg - Emit instructions to copy a pair of physical registers. + /// + /// This function should support copies within any legal register class as + /// well as any cross-class copies created during instruction selection. + /// + /// The source and destination registers may overlap, which may require a + /// careful implementation when multiple copy instructions are required for + /// large registers. See for example the ARM target. virtual void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, DebugLoc DL, unsigned DestReg, unsigned SrcReg, @@ -794,20 +801,6 @@ public: const MachineInstr *UseMI, unsigned UseIdx, bool FindMin = false) const; - /// computeOperandLatency - Compute and return the latency of the given data - /// dependent def and use. DefMI must be a valid def. UseMI may be NULL for - /// an unknown use. If the subtarget allows, this may or may not need to call - /// getOperandLatency(). - /// - /// FindMin may be set to get the minimum vs. expected latency. Minimum - /// latency is used for scheduling groups, while expected latency is for - /// instruction cost and critical path. - unsigned computeOperandLatency(const InstrItineraryData *ItinData, - const TargetRegisterInfo *TRI, - const MachineInstr *DefMI, - const MachineInstr *UseMI, - unsigned Reg, bool FindMin) const; - /// getOutputLatency - Compute and return the output dependency latency of a /// a given pair of defs which both target the same register. This is usually /// one. |