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comparison lib/Target/PowerPC/PPCFrameLowering.h @ 100:7d135dc70f03

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LLVM 3.9
author Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
date Tue, 26 Jan 2016 22:53:40 +0900
parents afa8332a0e37
children 1172e4bd9c6f
comparison
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96:6418606d0ead 100:7d135dc70f03
26 const unsigned ReturnSaveOffset; 26 const unsigned ReturnSaveOffset;
27 const unsigned TOCSaveOffset; 27 const unsigned TOCSaveOffset;
28 const unsigned FramePointerSaveOffset; 28 const unsigned FramePointerSaveOffset;
29 const unsigned LinkageSize; 29 const unsigned LinkageSize;
30 const unsigned BasePointerSaveOffset; 30 const unsigned BasePointerSaveOffset;
31
32 /**
33 * \brief Find a register that can be used in function prologue and epilogue
34 *
35 * Find a register that can be use as the scratch register in function
36 * prologue and epilogue to save various registers (Link Register, Base
37 * Pointer, etc.). Prefer R0, if it is available. If it is not available,
38 * then choose a different register.
39 *
40 * This method will return true if an available register was found (including
41 * R0). If no available registers are found, the method returns false and sets
42 * ScratchRegister to R0, as per the recommendation in the ABI.
43 *
44 * \param[in] MBB The machine basic block to find an available register for
45 * \param[in] UseAtEnd Specify whether the scratch register will be used at
46 * the end of the basic block (i.e., will the scratch
47 * register kill a register defined in the basic block)
48 * \param[out] ScratchRegister The scratch register to use
49 * \return true if a scratch register was found. false of a scratch register
50 * was not found and R0 is being used as the default.
51 */
52 bool findScratchRegister(MachineBasicBlock *MBB,
53 bool UseAtEnd,
54 unsigned *ScratchRegister) const;
31 55
32 public: 56 public:
33 PPCFrameLowering(const PPCSubtarget &STI); 57 PPCFrameLowering(const PPCSubtarget &STI);
34 58
35 unsigned determineFrameLayout(MachineFunction &MF, 59 unsigned determineFrameLayout(MachineFunction &MF,
92 116
93 const SpillSlot * 117 const SpillSlot *
94 getCalleeSavedSpillSlots(unsigned &NumEntries) const override; 118 getCalleeSavedSpillSlots(unsigned &NumEntries) const override;
95 119
96 bool enableShrinkWrapping(const MachineFunction &MF) const override; 120 bool enableShrinkWrapping(const MachineFunction &MF) const override;
121
122 /// Methods used by shrink wrapping to determine if MBB can be used for the
123 /// function prologue/epilogue.
124 bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
125 bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
97 }; 126 };
98 } // End llvm namespace 127 } // End llvm namespace
99 128
100 #endif 129 #endif