Use the space freed up by sparc and zaurus to import LLVM.

ok hackroom@

1 files changed, 142 insertions, 0 deletions

diff --git a/gnu/llvm/lib/Target/PowerPC/PPCFrameLowering.h b/gnu/llvm/lib/Target/PowerPC/PPCFrameLowering.h
new file mode 100644
index 00000000000..f1f3f0b831a
--- /dev/null
+++ b/gnu/llvm/lib/Target/PowerPC/PPCFrameLowering.h
@@ -0,0 +1,142 @@
+//===-- PPCFrameLowering.h - Define frame lowering for PowerPC --*- 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_POWERPC_PPCFRAMELOWERING_H
+#define LLVM_LIB_TARGET_POWERPC_PPCFRAMELOWERING_H
+
+#include "PPC.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetMachine.h"
+
+namespace llvm {
+class PPCSubtarget;
+
+class PPCFrameLowering: public TargetFrameLowering {
+  const PPCSubtarget &Subtarget;
+  const unsigned ReturnSaveOffset;
+  const unsigned TOCSaveOffset;
+  const unsigned FramePointerSaveOffset;
+  const unsigned LinkageSize;
+  const unsigned BasePointerSaveOffset;
+
+  /**
+   * \brief Find register[s] that can be used in function prologue and epilogue
+   *
+   * Find register[s] that can be use as scratch register[s] in function
+   * prologue and epilogue to save various registers (Link Register, Base
+   * Pointer, etc.). Prefer R0/R12, if available. Otherwise choose whatever
+   * register[s] are available.
+   *
+   * This method will return true if it is able to find enough unique scratch
+   * registers (1 or 2 depending on the requirement). If it is unable to find
+   * enough available registers in the block, it will return false and set
+   * any passed output parameter that corresponds to a required unique register
+   * to PPC::NoRegister.
+   *
+   * \param[in] MBB The machine basic block to find an available register for
+   * \param[in] UseAtEnd Specify whether the scratch register will be used at
+   *                     the end of the basic block (i.e., will the scratch
+   *                     register kill a register defined in the basic block)
+   * \param[in] TwoUniqueRegsRequired Specify whether this basic block will
+   *                                  require two unique scratch registers.
+   * \param[out] SR1 The scratch register to use
+   * \param[out] SR2 The second scratch register. If this pointer is not null
+   *                 the function will attempt to set it to an available
+   *                 register regardless of whether there is a hard requirement
+   *                 for two unique scratch registers.
+   * \return true if the required number of registers was found.
+   *         false if the required number of scratch register weren't available.
+   *         If either output parameter refers to a required scratch register
+   *         that isn't available, it will be set to an invalid value.
+   */
+  bool findScratchRegister(MachineBasicBlock *MBB,
+                           bool UseAtEnd,
+                           bool TwoUniqueRegsRequired = false,
+                           unsigned *SR1 = nullptr,
+                           unsigned *SR2 = nullptr) const;
+  bool twoUniqueScratchRegsRequired(MachineBasicBlock *MBB) const;
+
+public:
+  PPCFrameLowering(const PPCSubtarget &STI);
+
+  unsigned determineFrameLayout(MachineFunction &MF,
+                                bool UpdateMF = true,
+                                bool UseEstimate = false) const;
+
+  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
+  /// the function.
+  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+
+  bool hasFP(const MachineFunction &MF) const override;
+  bool needsFP(const MachineFunction &MF) const;
+  void replaceFPWithRealFP(MachineFunction &MF) const;
+
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                            RegScavenger *RS = nullptr) const override;
+  void processFunctionBeforeFrameFinalized(MachineFunction &MF,
+                                     RegScavenger *RS = nullptr) const override;
+  void addScavengingSpillSlot(MachineFunction &MF, RegScavenger *RS) const;
+
+  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                 MachineBasicBlock::iterator MI,
+                                 const std::vector<CalleeSavedInfo> &CSI,
+                                 const TargetRegisterInfo *TRI) const override;
+
+  void eliminateCallFramePseudoInstr(MachineFunction &MF,
+                                  MachineBasicBlock &MBB,
+                                  MachineBasicBlock::iterator I) const override;
+
+  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                  MachineBasicBlock::iterator MI,
+                                  const std::vector<CalleeSavedInfo> &CSI,
+                                  const TargetRegisterInfo *TRI) const override;
+
+  /// targetHandlesStackFrameRounding - Returns true if the target is
+  /// responsible for rounding up the stack frame (probably at emitPrologue
+  /// time).
+  bool targetHandlesStackFrameRounding() const override { return true; }
+
+  /// getReturnSaveOffset - Return the previous frame offset to save the
+  /// return address.
+  unsigned getReturnSaveOffset() const { return ReturnSaveOffset; }
+
+  /// getTOCSaveOffset - Return the previous frame offset to save the
+  /// TOC register -- 64-bit SVR4 ABI only.
+  unsigned getTOCSaveOffset() const { return TOCSaveOffset; }
+
+  /// getFramePointerSaveOffset - Return the previous frame offset to save the
+  /// frame pointer.
+  unsigned getFramePointerSaveOffset() const { return FramePointerSaveOffset; }
+
+  /// getBasePointerSaveOffset - Return the previous frame offset to save the
+  /// base pointer.
+  unsigned getBasePointerSaveOffset() const { return BasePointerSaveOffset; }
+
+  /// getLinkageSize - Return the size of the PowerPC ABI linkage area.
+  ///
+  unsigned getLinkageSize() const { return LinkageSize; }
+
+  const SpillSlot *
+  getCalleeSavedSpillSlots(unsigned &NumEntries) const override;
+
+  bool enableShrinkWrapping(const MachineFunction &MF) const override;
+
+  /// Methods used by shrink wrapping to determine if MBB can be used for the
+  /// function prologue/epilogue.
+  bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
+  bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
+};
+} // End llvm namespace
+
+#endif