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//===- SystemZInstrBuilder.h - Functions to aid building insts -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file exposes functions that may be used with BuildMI from the
// MachineInstrBuilder.h file to handle SystemZ'isms in a clean way.
//
// The BuildMem function may be used with the BuildMI function to add entire
// memory references in a single, typed, function call.
//
// For reference, the order of operands for memory references is:
// (Operand), Base, Displacement, Index.
//
//===----------------------------------------------------------------------===//
#ifndef SYSTEMZINSTRBUILDER_H
#define SYSTEMZINSTRBUILDER_H
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
namespace llvm {
/// SystemZAddressMode - This struct holds a generalized full x86 address mode.
/// The base register can be a frame index, which will eventually be replaced
/// with R15 or R11 and Disp being offsetted accordingly.
struct SystemZAddressMode {
enum {
RegBase,
FrameIndexBase
} BaseType;
union {
unsigned Reg;
int FrameIndex;
} Base;
unsigned IndexReg;
int32_t Disp;
GlobalValue *GV;
SystemZAddressMode() : BaseType(RegBase), IndexReg(0), Disp(0) {
Base.Reg = 0;
}
};
/// addDirectMem - This function is used to add a direct memory reference to the
/// current instruction -- that is, a dereference of an address in a register,
/// with no index or displacement.
///
static inline const MachineInstrBuilder &
addDirectMem(const MachineInstrBuilder &MIB, unsigned Reg) {
// Because memory references are always represented with 3
// values, this adds: Reg, [0, NoReg] to the instruction.
return MIB.addReg(Reg).addImm(0).addReg(0);
}
static inline const MachineInstrBuilder &
addOffset(const MachineInstrBuilder &MIB, int Offset) {
return MIB.addImm(Offset).addReg(0);
}
/// addRegOffset - This function is used to add a memory reference of the form
/// [Reg + Offset], i.e., one with no or index, but with a
/// displacement. An example is: 10(%r15).
///
static inline const MachineInstrBuilder &
addRegOffset(const MachineInstrBuilder &MIB,
unsigned Reg, bool isKill, int Offset) {
return addOffset(MIB.addReg(Reg, getKillRegState(isKill)), Offset);
}
/// addRegReg - This function is used to add a memory reference of the form:
/// [Reg + Reg].
static inline const MachineInstrBuilder &
addRegReg(const MachineInstrBuilder &MIB,
unsigned Reg1, bool isKill1, unsigned Reg2, bool isKill2) {
return MIB.addReg(Reg1, getKillRegState(isKill1)).addImm(0)
.addReg(Reg2, getKillRegState(isKill2));
}
static inline const MachineInstrBuilder &
addFullAddress(const MachineInstrBuilder &MIB, const SystemZAddressMode &AM) {
if (AM.BaseType == SystemZAddressMode::RegBase)
MIB.addReg(AM.Base.Reg);
else if (AM.BaseType == SystemZAddressMode::FrameIndexBase)
MIB.addFrameIndex(AM.Base.FrameIndex);
else
assert(0);
return MIB.addImm(AM.Disp).addReg(AM.IndexReg);
}
/// addFrameReference - This function is used to add a reference to the base of
/// an abstract object on the stack frame of the current function. This
/// reference has base register as the FrameIndex offset until it is resolved.
/// This allows a constant offset to be specified as well...
///
static inline const MachineInstrBuilder &
addFrameReference(const MachineInstrBuilder &MIB, int FI, int Offset = 0) {
MachineInstr *MI = MIB;
MachineFunction &MF = *MI->getParent()->getParent();
MachineFrameInfo &MFI = *MF.getFrameInfo();
const TargetInstrDesc &TID = MI->getDesc();
unsigned Flags = 0;
if (TID.mayLoad())
Flags |= MachineMemOperand::MOLoad;
if (TID.mayStore())
Flags |= MachineMemOperand::MOStore;
MachineMemOperand *MMO =
MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
Flags, Offset,
MFI.getObjectSize(FI),
MFI.getObjectAlignment(FI));
return addOffset(MIB.addFrameIndex(FI), Offset)
.addMemOperand(MMO);
}
} // End llvm namespace
#endif
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