MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const override;
+ /// Check the instruction before/after the passed instruction. If
+ /// it is an ADD/SUB/LEA instruction it is deleted argument and the
+ /// stack adjustment is returned as a positive value for ADD/LEA and
+ /// a negative for SUB.
+ static int mergeSPUpdates(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned StackPtr, bool doMergeWithPrevious);
+
+ /// Emit a series of instructions to increment / decrement the stack
+ /// pointer by a constant value.
+ static void emitSPUpdate(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI, unsigned StackPtr,
+ int64_t NumBytes, bool Is64BitTarget,
+ bool Is64BitStackPtr, bool UseLEA,
+ const TargetInstrInfo &TII,
+ const TargetRegisterInfo &TRI);
+
+ /// Check that LEA can be use on SP in a prologue sequence for \p MF.
+ bool useLEAForSPInProlog(const MachineFunction &MF) const;
+
private:
/// convertArgMovsToPushes - This method tries to convert a call sequence
/// that uses sub and mov instructions to put the argument onto the stack