1 files changed, 109 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Hexagon/HexagonFrameLowering.h b/contrib/llvm/lib/Target/Hexagon/HexagonFrameLowering.h
new file mode 100644
index 0000000..683b303
--- /dev/null
+++ b/contrib/llvm/lib/Target/Hexagon/HexagonFrameLowering.h
@@ -0,0 +1,109 @@
+//=- HexagonFrameLowering.h - Define frame lowering for Hexagon --*- C++ -*--=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONFRAMELOWERING_H
+#define LLVM_LIB_TARGET_HEXAGON_HEXAGONFRAMELOWERING_H
+
+#include "Hexagon.h"
+#include "llvm/Target/TargetFrameLowering.h"
+
+namespace llvm {
+
+class HexagonInstrInfo;
+class HexagonRegisterInfo;
+
+class HexagonFrameLowering : public TargetFrameLowering {
+public:
+  explicit HexagonFrameLowering()
+      : TargetFrameLowering(StackGrowsDown, 8, 0, 1, true) {}
+
+  // All of the prolog/epilog functionality, including saving and restoring
+  // callee-saved registers is handled in emitPrologue. This is to have the
+  // logic for shrink-wrapping in one place.
+  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const
+      override;
+  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
+      override {}
+  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+      MachineBasicBlock::iterator MI, const std::vector<CalleeSavedInfo> &CSI,
+      const TargetRegisterInfo *TRI) const override {
+    return true;
+  }
+  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+      MachineBasicBlock::iterator MI, const std::vector<CalleeSavedInfo> &CSI,
+      const TargetRegisterInfo *TRI) const override {
+    return true;
+  }
+
+  void eliminateCallFramePseudoInstr(MachineFunction &MF,
+      MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const override;
+  void processFunctionBeforeFrameFinalized(MachineFunction &MF,
+        RegScavenger *RS = nullptr) const override;
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+        RegScavenger *RS) const override;
+
+  bool targetHandlesStackFrameRounding() const override {
+    return true;
+  }
+  int getFrameIndexReference(const MachineFunction &MF, int FI,
+                             unsigned &FrameReg) const override;
+  bool hasFP(const MachineFunction &MF) const override;
+
+  const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries)
+        const override {
+    static const SpillSlot Offsets[] = {
+      { Hexagon::R17, -4 }, { Hexagon::R16, -8 }, { Hexagon::D8, -8 },
+      { Hexagon::R19, -12 }, { Hexagon::R18, -16 }, { Hexagon::D9, -16 },
+      { Hexagon::R21, -20 }, { Hexagon::R20, -24 }, { Hexagon::D10, -24 },
+      { Hexagon::R23, -28 }, { Hexagon::R22, -32 }, { Hexagon::D11, -32 },
+      { Hexagon::R25, -36 }, { Hexagon::R24, -40 }, { Hexagon::D12, -40 },
+      { Hexagon::R27, -44 }, { Hexagon::R26, -48 }, { Hexagon::D13, -48 }
+    };
+    NumEntries = array_lengthof(Offsets);
+    return Offsets;
+  }
+
+  bool assignCalleeSavedSpillSlots(MachineFunction &MF,
+      const TargetRegisterInfo *TRI, std::vector<CalleeSavedInfo> &CSI)
+      const override;
+
+  bool needsAligna(const MachineFunction &MF) const;
+  const MachineInstr *getAlignaInstr(const MachineFunction &MF) const;
+
+  void insertCFIInstructions(MachineFunction &MF) const;
+
+private:
+  typedef std::vector<CalleeSavedInfo> CSIVect;
+
+  void expandAlloca(MachineInstr *AI, const HexagonInstrInfo &TII,
+      unsigned SP, unsigned CF) const;
+  void insertPrologueInBlock(MachineBasicBlock &MBB) const;
+  void insertEpilogueInBlock(MachineBasicBlock &MBB) const;
+  bool insertCSRSpillsInBlock(MachineBasicBlock &MBB, const CSIVect &CSI,
+      const HexagonRegisterInfo &HRI) const;
+  bool insertCSRRestoresInBlock(MachineBasicBlock &MBB, const CSIVect &CSI,
+      const HexagonRegisterInfo &HRI) const;
+  void insertCFIInstructionsAt(MachineBasicBlock &MBB,
+      MachineBasicBlock::iterator At) const;
+
+  void adjustForCalleeSavedRegsSpillCall(MachineFunction &MF) const;
+  bool replacePredRegPseudoSpillCode(MachineFunction &MF) const;
+  bool replaceVecPredRegPseudoSpillCode(MachineFunction &MF) const;
+
+  void findShrunkPrologEpilog(MachineFunction &MF, MachineBasicBlock *&PrologB,
+      MachineBasicBlock *&EpilogB) const;
+
+  bool shouldInlineCSR(llvm::MachineFunction &MF, const CSIVect &CSI) const;
+  bool useSpillFunction(MachineFunction &MF, const CSIVect &CSI) const;
+  bool useRestoreFunction(MachineFunction &MF, const CSIVect &CSI) const;
+};
+
+} // End llvm namespace
+
+#endif