diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86FrameLowering.h')
| -rw-r--r-- | llvm/lib/Target/X86/X86FrameLowering.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.h b/llvm/lib/Target/X86/X86FrameLowering.h index a23bce9745e..eeeda75d337 100644 --- a/llvm/lib/Target/X86/X86FrameLowering.h +++ b/llvm/lib/Target/X86/X86FrameLowering.h @@ -79,6 +79,26 @@ public: 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 |
