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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
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
//===- SystemZRegisterInfo.h - SystemZ 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 SystemZ implementation of the TargetRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SystemZREGISTERINFO_H
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#define SystemZREGISTERINFO_H
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "SystemZGenRegisterInfo.h.inc"
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namespace llvm {
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namespace SystemZ {
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/// SubregIndex - The index of various sized subregister classes. Note that
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/// these indices must be kept in sync with the class indices in the
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/// SystemZRegisterInfo.td file.
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enum SubregIndex {
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SUBREG_32BIT = 1, SUBREG_EVEN = 1, SUBREG_ODD = 2
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};
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}
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class SystemZSubtarget;
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class SystemZInstrInfo;
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class Type;
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struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
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SystemZTargetMachine &TM;
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const SystemZInstrInfo &TII;
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SystemZRegisterInfo(SystemZTargetMachine &tm, const SystemZInstrInfo &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* getCalleeSavedRegClasses(
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const MachineFunction *MF = 0) const;
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BitVector getReservedRegs(const MachineFunction &MF) const;
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bool hasReservedCallFrame(MachineFunction &MF) const { return true; }
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bool hasFP(const MachineFunction &MF) const;
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int getFrameIndexOffset(MachineFunction &MF, int FI) 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 processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS) 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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// Debug information queries.
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unsigned getRARegister() const;
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unsigned getFrameRegister(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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int getDwarfRegNum(unsigned RegNum, bool isEH) const;
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};
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} // end namespace llvm
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#endif
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