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On PowerPC, non-vector loads and stores have r+i forms; however, in functions with large stack frames these were not being used to access slots far from the stack pointer because such slots were out of range for the signed 16-bit immediate offset field. This increases register pressure because we need a separate register for each offset (when the r+r form is used). By enabling virtual base registers, we can deal with large stack frames without unduly increasing register pressure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179105 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
//===-- PPCRegisterInfo.h - PowerPC Register Information Impl ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the PowerPC implementation of the TargetRegisterInfo
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// class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPC32_REGISTERINFO_H
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#define POWERPC32_REGISTERINFO_H
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#include "llvm/ADT/DenseMap.h"
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#include "PPC.h"
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#define GET_REGINFO_HEADER
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#include "PPCGenRegisterInfo.inc"
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namespace llvm {
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class PPCSubtarget;
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class TargetInstrInfo;
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class Type;
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class PPCRegisterInfo : public PPCGenRegisterInfo {
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DenseMap<unsigned, unsigned> ImmToIdxMap;
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const PPCSubtarget &Subtarget;
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const TargetInstrInfo &TII;
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public:
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PPCRegisterInfo(const PPCSubtarget &SubTarget, const TargetInstrInfo &tii);
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/// getPointerRegClass - Return the register class to use to hold pointers.
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/// This is used for addressing modes.
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virtual const TargetRegisterClass *
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getPointerRegClass(const MachineFunction &MF, unsigned Kind=0) const;
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unsigned getRegPressureLimit(const TargetRegisterClass *RC,
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MachineFunction &MF) const;
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/// Code Generation virtual methods...
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const uint16_t *getCalleeSavedRegs(const MachineFunction* MF = 0) const;
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const uint32_t *getCallPreservedMask(CallingConv::ID CC) const;
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const uint32_t *getNoPreservedMask() const;
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BitVector getReservedRegs(const MachineFunction &MF) const;
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/// We require the register scavenger.
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bool requiresRegisterScavenging(const MachineFunction &MF) const {
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return true;
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}
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bool requiresFrameIndexScavenging(const MachineFunction &MF) const {
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return true;
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}
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bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
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return true;
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}
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virtual bool requiresVirtualBaseRegisters(const MachineFunction &MF) const {
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return true;
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}
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void lowerDynamicAlloc(MachineBasicBlock::iterator II) const;
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void lowerCRSpilling(MachineBasicBlock::iterator II,
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unsigned FrameIndex) const;
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void lowerCRRestore(MachineBasicBlock::iterator II,
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unsigned FrameIndex) const;
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void lowerVRSAVESpilling(MachineBasicBlock::iterator II,
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unsigned FrameIndex) const;
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void lowerVRSAVERestore(MachineBasicBlock::iterator II,
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unsigned FrameIndex) const;
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bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
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int &FrameIdx) const;
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void eliminateFrameIndex(MachineBasicBlock::iterator II,
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int SPAdj, unsigned FIOperandNum,
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RegScavenger *RS = NULL) const;
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// Support for virtual base registers.
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bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const;
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void materializeFrameBaseRegister(MachineBasicBlock *MBB,
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unsigned BaseReg, int FrameIdx,
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int64_t Offset) const;
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void resolveFrameIndex(MachineBasicBlock::iterator I,
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unsigned BaseReg, int64_t Offset) const;
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bool isFrameOffsetLegal(const MachineInstr *MI, int64_t Offset) const;
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// Debug information queries.
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unsigned getFrameRegister(const MachineFunction &MF) const;
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// Exception handling queries.
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unsigned getEHExceptionRegister() const;
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unsigned getEHHandlerRegister() const;
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};
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} // end namespace llvm
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#endif
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