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b58f498f75
a virtual register to eliminate a frame index, it can return that register and the constant stored there to PEI to track. When scavenging to allocate for those registers, PEI then tracks the last-used register and value, and if it is still available and matches the value for the next index, reuses the existing value rather and removes the re-materialization instructions. Fancier tracking and adjustment of scavenger allocations to keep more values live for longer is possible, but not yet implemented and would likely be better done via a different, less special-purpose, approach to the problem. eliminateFrameIndex() is modified so the target implementations can return the registers they wish to be tracked for reuse. ARM Thumb1 implements and utilizes the new mechanism. All other targets are simply modified to adjust for the changed eliminateFrameIndex() prototype. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83467 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//===- MSP430RegisterInfo.h - MSP430 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 MSP430 implementation of the MRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_MSP430REGISTERINFO_H
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#define LLVM_TARGET_MSP430REGISTERINFO_H
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "MSP430GenRegisterInfo.h.inc"
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namespace llvm {
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class TargetInstrInfo;
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class MSP430TargetMachine;
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struct MSP430RegisterInfo : public MSP430GenRegisterInfo {
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private:
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MSP430TargetMachine &TM;
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const TargetInstrInfo &TII;
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/// StackAlign - Default stack alignment.
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///
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unsigned StackAlign;
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public:
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MSP430RegisterInfo(MSP430TargetMachine &tm, const TargetInstrInfo &tii);
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/// Code Generation virtual methods...
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const unsigned *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
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const TargetRegisterClass* const*
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getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
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BitVector getReservedRegs(const MachineFunction &MF) const;
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const TargetRegisterClass* getPointerRegClass(unsigned Kind = 0) const;
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bool hasFP(const MachineFunction &MF) const;
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bool hasReservedCallFrame(MachineFunction &MF) const;
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void eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const;
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unsigned eliminateFrameIndex(MachineBasicBlock::iterator II,
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int SPAdj, int *Value = NULL,
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RegScavenger *RS = NULL) const;
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void emitPrologue(MachineFunction &MF) const;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
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// Debug information queries.
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unsigned getRARegister() const;
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unsigned getFrameRegister(MachineFunction &MF) const;
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//! Get DWARF debugging register number
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int getDwarfRegNum(unsigned RegNum, bool isEH) const;
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};
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} // end namespace llvm
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#endif // LLVM_TARGET_MSP430REGISTERINFO_H
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