mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
648f00c2f0
reserving a physical register ($gp or $28) for that purpose. This will completely eliminate loads that restore the value of $gp after every function call, if the register allocator assigns a callee-saved register, or eliminate unnecessary loads if it assigns a temporary register. example: .cpload $25 // set $gp. ... .cprestore 16 // store $gp to stack slot 16($sp). ... jalr $25 // function call. clobbers $gp. lw $gp, 16($sp) // not emitted if callee-saved reg is chosen. ... lw $2, 4($gp) ... jalr $25 // function call. lw $gp, 16($sp) // not emitted if $gp is not live after this instruction. ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151402 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===-- MipsMCInstLower.h - Lower MachineInstr to MCInst -------*- C++ -*--===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef MIPSMCINSTLOWER_H
|
|
#define MIPSMCINSTLOWER_H
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/CodeGen/MachineOperand.h"
|
|
#include "llvm/Support/Compiler.h"
|
|
|
|
namespace llvm {
|
|
class MCAsmInfo;
|
|
class MCContext;
|
|
class MCInst;
|
|
class MCOperand;
|
|
class MCSymbol;
|
|
class MachineInstr;
|
|
class MachineFunction;
|
|
class Mangler;
|
|
class MipsAsmPrinter;
|
|
|
|
/// MipsMCInstLower - This class is used to lower an MachineInstr into an
|
|
// MCInst.
|
|
class LLVM_LIBRARY_VISIBILITY MipsMCInstLower {
|
|
typedef MachineOperand::MachineOperandType MachineOperandType;
|
|
MCContext &Ctx;
|
|
Mangler *Mang;
|
|
MipsAsmPrinter &AsmPrinter;
|
|
public:
|
|
MipsMCInstLower(Mangler *mang, const MachineFunction &MF,
|
|
MipsAsmPrinter &asmprinter);
|
|
void Lower(const MachineInstr *MI, MCInst &OutMI) const;
|
|
void LowerCPLOAD(const MachineInstr *MI, SmallVector<MCInst, 4>& MCInsts);
|
|
void LowerCPRESTORE(const MachineInstr *MI, SmallVector<MCInst, 4>& MCInsts);
|
|
void LowerUnalignedLoadStore(const MachineInstr *MI,
|
|
SmallVector<MCInst, 4>& MCInsts);
|
|
void LowerSETGP01(const MachineInstr *MI, SmallVector<MCInst, 4>& MCInsts);
|
|
private:
|
|
MCOperand LowerSymbolOperand(const MachineOperand &MO,
|
|
MachineOperandType MOTy, unsigned Offset) const;
|
|
MCOperand LowerOperand(const MachineOperand& MO, unsigned offset = 0) const;
|
|
};
|
|
}
|
|
|
|
#endif
|