X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FHexagon%2FHexagonFrameLowering.h;h=683b303d43ead268d992f33915ff2c77b4fb4575;hb=a1bbb47859cf25d4592915722a24740b93fe6192;hp=a62c76aaf6760acf90917404bcfdd4c09d04c8e8;hpb=700ed80d3da5e98e05ceb90e9bfb66058581a6db;p=oota-llvm.git

diff --git a/lib/Target/Hexagon/HexagonFrameLowering.h b/lib/Target/Hexagon/HexagonFrameLowering.h
index a62c76aaf67..683b303d43e 100644
--- a/lib/Target/Hexagon/HexagonFrameLowering.h
+++ b/lib/Target/Hexagon/HexagonFrameLowering.h
@@ -7,47 +7,101 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef HEXAGON_FRAMEINFO_H
-#define HEXAGON_FRAMEINFO_H
+#ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONFRAMELOWERING_H
+#define LLVM_LIB_TARGET_HEXAGON_HEXAGONFRAMELOWERING_H
 
 #include "Hexagon.h"
-#include "HexagonSubtarget.h"
 #include "llvm/Target/TargetFrameLowering.h"
 
 namespace llvm {
 
-class HexagonFrameLowering : public TargetFrameLowering {
-private:
-  const HexagonSubtarget &STI;
-  void determineFrameLayout(MachineFunction &MF) const;
+class HexagonInstrInfo;
+class HexagonRegisterInfo;
 
+class HexagonFrameLowering : public TargetFrameLowering {
 public:
-  explicit HexagonFrameLowering(const HexagonSubtarget &sti)
-    : TargetFrameLowering(StackGrowsDown, 8, 0), STI(sti) {
-  }
+  explicit HexagonFrameLowering()
+      : TargetFrameLowering(StackGrowsDown, 8, 0, 1, true) {}
 
-  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
-  /// the function.
-  void emitPrologue(MachineFunction &MF) const;
-  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
-  virtual bool
-  spillCalleeSavedRegisters(MachineBasicBlock &MBB,
-                            MachineBasicBlock::iterator MI,
-                            const std::vector<CalleeSavedInfo> &CSI,
-                            const TargetRegisterInfo *TRI) const;
+  // 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;
-
-  virtual bool
-  restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
-                              MachineBasicBlock::iterator MI,
-                              const std::vector<CalleeSavedInfo> &CSI,
-                              const TargetRegisterInfo *TRI) const;
-  int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
-  bool hasFP(const MachineFunction &MF) const;
-  bool hasTailCall(MachineBasicBlock &MBB) const;
+      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