Reapply r238011 with a fix for the trap instruction.

[oota-llvm.git] / lib / Target / X86 / X86FrameLowering.h

diff --git a/lib/Target/X86/X86FrameLowering.h b/lib/Target/X86/X86FrameLowering.h
index a23bce9745e2707d31d69a5c4740128221372985..eeeda75d33783114ac3b66f632574ac35bda95c6 100644 (file)
--- a/lib/Target/X86/X86FrameLowering.h
+++ b/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