llvm-6502/lib/Target/CellSPU/SPURegisterInfo.h
Kalle Raiskila d258c49589 Switch SPU calling convention (function arguments)
to a Tablegen implementation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107913 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-08 21:15:22 +00:00

110 lines
4.1 KiB
C++

//===- SPURegisterInfo.h - Cell SPU Register Information Impl ----*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the Cell SPU implementation of the TargetRegisterInfo
// class.
//
//===----------------------------------------------------------------------===//
#ifndef SPU_REGISTERINFO_H
#define SPU_REGISTERINFO_H
#include "SPU.h"
#include "SPUGenRegisterInfo.h.inc"
namespace llvm {
class SPUSubtarget;
class TargetInstrInfo;
class Type;
class SPURegisterInfo : public SPUGenRegisterInfo {
private:
const SPUSubtarget &Subtarget;
const TargetInstrInfo &TII;
//! Predicate: Does the machine function use the link register?
bool usesLR(MachineFunction &MF) const;
public:
SPURegisterInfo(const SPUSubtarget &subtarget, const TargetInstrInfo &tii);
//! Translate a register's enum value to a register number
/*!
This method translates a register's enum value to it's regiser number,
e.g. SPU::R14 -> 14.
*/
static unsigned getRegisterNumbering(unsigned RegEnum);
/// getPointerRegClass - Return the register class to use to hold pointers.
/// This is used for addressing modes.
virtual const TargetRegisterClass *
getPointerRegClass(unsigned Kind = 0) const;
//! Return the array of callee-saved registers
virtual const unsigned* getCalleeSavedRegs(const MachineFunction *MF) const;
//! Allow for scavenging, so we can get scratch registers when needed.
virtual bool requiresRegisterScavenging(const MachineFunction &MF) const
{ return true; }
//! Return the reserved registers
BitVector getReservedRegs(const MachineFunction &MF) const;
//! Prediate: Target has dedicated frame pointer
bool hasFP(const MachineFunction &MF) const;
//! Eliminate the call frame setup pseudo-instructions
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;
//! Convert frame indicies into machine operands
unsigned eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
FrameIndexValue *Value = NULL,
RegScavenger *RS = NULL) const;
//! Determine the frame's layour
void determineFrameLayout(MachineFunction &MF) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS = NULL) const;
//! Emit the function prologue
void emitPrologue(MachineFunction &MF) const;
//! Emit the function epilogue
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
//! Get return address register (LR, aka R0)
unsigned getRARegister() const;
//! Get the stack frame register (SP, aka R1)
unsigned getFrameRegister(const MachineFunction &MF) const;
//! Perform target-specific stack frame setup.
void getInitialFrameState(std::vector<MachineMove> &Moves) const;
//------------------------------------------------------------------------
// New methods added:
//------------------------------------------------------------------------
//! Get DWARF debugging register number
int getDwarfRegNum(unsigned RegNum, bool isEH) const;
//! Convert D-form load/store to X-form load/store
/*!
Converts a regiser displacement load/store into a register-indexed
load/store for large stack frames, when the stack frame exceeds the
range of a s10 displacement.
*/
int convertDFormToXForm(int dFormOpcode) const;
//! Acquire an unused register in an emergency.
unsigned findScratchRegister(MachineBasicBlock::iterator II,
RegScavenger *RS,
const TargetRegisterClass *RC,
int SPAdj) const;
};
} // end namespace llvm
#endif