llvm-6502/lib/Target/Mips/MipsMCInstLower.h
Sasa Stankovic 95ce098219 [mips] Optimize long branch for MIPS64 by removing %higher and %highest.
%higher and %highest can have non-zero values only for offsets greater
than 2GB, which is highly unlikely, if not impossible when compiling a
single function. This makes long branch for MIPS64 3 instructions smaller.

Differential Revision: http://llvm-reviews.chandlerc.com/D3281.diff


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209678 91177308-0d34-0410-b5e6-96231b3b80d8
2014-05-27 18:53:06 +00:00

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 "MCTargetDesc/MipsMCExpr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
class MCContext;
class MCInst;
class MCOperand;
class MachineInstr;
class MachineFunction;
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;
MipsAsmPrinter &AsmPrinter;
public:
MipsMCInstLower(MipsAsmPrinter &asmprinter);
void Initialize(MCContext *C);
void Lower(const MachineInstr *MI, MCInst &OutMI) const;
MCOperand LowerOperand(const MachineOperand& MO, unsigned offset = 0) const;
private:
MCOperand LowerSymbolOperand(const MachineOperand &MO,
MachineOperandType MOTy, unsigned Offset) const;
MCOperand createSub(MachineBasicBlock *BB1, MachineBasicBlock *BB2,
MCSymbolRefExpr::VariantKind Kind) const;
void lowerLongBranchLUi(const MachineInstr *MI, MCInst &OutMI) const;
void lowerLongBranchADDiu(const MachineInstr *MI, MCInst &OutMI,
int Opcode,
MCSymbolRefExpr::VariantKind Kind) const;
bool lowerLongBranch(const MachineInstr *MI, MCInst &OutMI) const;
};
}
#endif