mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-06 05:06:45 +00:00
31e874490a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76313 91177308-0d34-0410-b5e6-96231b3b80d8
673 lines
23 KiB
C++
673 lines
23 KiB
C++
//===- SystemZInstrInfo.cpp - SystemZ Instruction Information --------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains the SystemZ implementation of the TargetInstrInfo class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "SystemZ.h"
|
|
#include "SystemZInstrBuilder.h"
|
|
#include "SystemZInstrInfo.h"
|
|
#include "SystemZMachineFunctionInfo.h"
|
|
#include "SystemZTargetMachine.h"
|
|
#include "SystemZGenInstrInfo.inc"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
#include "llvm/CodeGen/PseudoSourceValue.h"
|
|
|
|
using namespace llvm;
|
|
|
|
SystemZInstrInfo::SystemZInstrInfo(SystemZTargetMachine &tm)
|
|
: TargetInstrInfoImpl(SystemZInsts, array_lengthof(SystemZInsts)),
|
|
RI(tm, *this), TM(tm) {
|
|
// Fill the spill offsets map
|
|
static const unsigned SpillOffsTab[][2] = {
|
|
{ SystemZ::R2D, 0x10 },
|
|
{ SystemZ::R3D, 0x18 },
|
|
{ SystemZ::R4D, 0x20 },
|
|
{ SystemZ::R5D, 0x28 },
|
|
{ SystemZ::R6D, 0x30 },
|
|
{ SystemZ::R7D, 0x38 },
|
|
{ SystemZ::R8D, 0x40 },
|
|
{ SystemZ::R9D, 0x48 },
|
|
{ SystemZ::R10D, 0x50 },
|
|
{ SystemZ::R11D, 0x58 },
|
|
{ SystemZ::R12D, 0x60 },
|
|
{ SystemZ::R13D, 0x68 },
|
|
{ SystemZ::R14D, 0x70 },
|
|
{ SystemZ::R15D, 0x78 }
|
|
};
|
|
|
|
RegSpillOffsets.grow(SystemZ::NUM_TARGET_REGS);
|
|
|
|
for (unsigned i = 0, e = array_lengthof(SpillOffsTab); i != e; ++i)
|
|
RegSpillOffsets[SpillOffsTab[i][0]] = SpillOffsTab[i][1];
|
|
}
|
|
|
|
/// isGVStub - Return true if the GV requires an extra load to get the
|
|
/// real address.
|
|
static inline bool isGVStub(GlobalValue *GV, SystemZTargetMachine &TM) {
|
|
return TM.getSubtarget<SystemZSubtarget>().GVRequiresExtraLoad(GV, TM, false);
|
|
}
|
|
|
|
void SystemZInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
unsigned SrcReg, bool isKill, int FrameIdx,
|
|
const TargetRegisterClass *RC) const {
|
|
DebugLoc DL = DebugLoc::getUnknownLoc();
|
|
if (MI != MBB.end()) DL = MI->getDebugLoc();
|
|
|
|
unsigned Opc = 0;
|
|
if (RC == &SystemZ::GR32RegClass ||
|
|
RC == &SystemZ::ADDR32RegClass)
|
|
Opc = SystemZ::MOV32mr;
|
|
else if (RC == &SystemZ::GR64RegClass ||
|
|
RC == &SystemZ::ADDR64RegClass) {
|
|
Opc = SystemZ::MOV64mr;
|
|
} else if (RC == &SystemZ::FP32RegClass) {
|
|
Opc = SystemZ::FMOV32mr;
|
|
} else if (RC == &SystemZ::FP64RegClass) {
|
|
Opc = SystemZ::FMOV64mr;
|
|
} else if (RC == &SystemZ::GR64PRegClass) {
|
|
Opc = SystemZ::MOV64Pmr;
|
|
} else if (RC == &SystemZ::GR128RegClass) {
|
|
Opc = SystemZ::MOV128mr;
|
|
} else
|
|
llvm_unreachable("Unsupported regclass to store");
|
|
|
|
addFrameReference(BuildMI(MBB, MI, DL, get(Opc)), FrameIdx)
|
|
.addReg(SrcReg, getKillRegState(isKill));
|
|
}
|
|
|
|
void SystemZInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
unsigned DestReg, int FrameIdx,
|
|
const TargetRegisterClass *RC) const{
|
|
DebugLoc DL = DebugLoc::getUnknownLoc();
|
|
if (MI != MBB.end()) DL = MI->getDebugLoc();
|
|
|
|
unsigned Opc = 0;
|
|
if (RC == &SystemZ::GR32RegClass ||
|
|
RC == &SystemZ::ADDR32RegClass)
|
|
Opc = SystemZ::MOV32rm;
|
|
else if (RC == &SystemZ::GR64RegClass ||
|
|
RC == &SystemZ::ADDR64RegClass) {
|
|
Opc = SystemZ::MOV64rm;
|
|
} else if (RC == &SystemZ::FP32RegClass) {
|
|
Opc = SystemZ::FMOV32rm;
|
|
} else if (RC == &SystemZ::FP64RegClass) {
|
|
Opc = SystemZ::FMOV64rm;
|
|
} else if (RC == &SystemZ::GR64PRegClass) {
|
|
Opc = SystemZ::MOV64Prm;
|
|
} else if (RC == &SystemZ::GR128RegClass) {
|
|
Opc = SystemZ::MOV128rm;
|
|
} else
|
|
llvm_unreachable("Unsupported regclass to load");
|
|
|
|
addFrameReference(BuildMI(MBB, MI, DL, get(Opc), DestReg), FrameIdx);
|
|
}
|
|
|
|
bool SystemZInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator I,
|
|
unsigned DestReg, unsigned SrcReg,
|
|
const TargetRegisterClass *DestRC,
|
|
const TargetRegisterClass *SrcRC) const {
|
|
DebugLoc DL = DebugLoc::getUnknownLoc();
|
|
if (I != MBB.end()) DL = I->getDebugLoc();
|
|
|
|
// Determine if DstRC and SrcRC have a common superclass.
|
|
const TargetRegisterClass *CommonRC = DestRC;
|
|
if (DestRC == SrcRC)
|
|
/* Same regclass for source and dest */;
|
|
else if (CommonRC->hasSuperClass(SrcRC))
|
|
CommonRC = SrcRC;
|
|
else if (!CommonRC->hasSubClass(SrcRC))
|
|
CommonRC = 0;
|
|
|
|
if (CommonRC) {
|
|
if (CommonRC == &SystemZ::GR64RegClass ||
|
|
CommonRC == &SystemZ::ADDR64RegClass) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::MOV64rr), DestReg).addReg(SrcReg);
|
|
} else if (CommonRC == &SystemZ::GR32RegClass ||
|
|
CommonRC == &SystemZ::ADDR32RegClass) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::MOV32rr), DestReg).addReg(SrcReg);
|
|
} else if (CommonRC == &SystemZ::GR64PRegClass) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::MOV64rrP), DestReg).addReg(SrcReg);
|
|
} else if (CommonRC == &SystemZ::GR128RegClass) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::MOV128rr), DestReg).addReg(SrcReg);
|
|
} else if (CommonRC == &SystemZ::FP32RegClass) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::FMOV32rr), DestReg).addReg(SrcReg);
|
|
} else if (CommonRC == &SystemZ::FP64RegClass) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::FMOV64rr), DestReg).addReg(SrcReg);
|
|
} else {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
if ((SrcRC == &SystemZ::GR64RegClass &&
|
|
DestRC == &SystemZ::ADDR64RegClass) ||
|
|
(DestRC == &SystemZ::GR64RegClass &&
|
|
SrcRC == &SystemZ::ADDR64RegClass)) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::MOV64rr), DestReg).addReg(SrcReg);
|
|
return true;
|
|
} else if ((SrcRC == &SystemZ::GR32RegClass &&
|
|
DestRC == &SystemZ::ADDR32RegClass) ||
|
|
(DestRC == &SystemZ::GR32RegClass &&
|
|
SrcRC == &SystemZ::ADDR32RegClass)) {
|
|
BuildMI(MBB, I, DL, get(SystemZ::MOV32rr), DestReg).addReg(SrcReg);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
SystemZInstrInfo::isMoveInstr(const MachineInstr& MI,
|
|
unsigned &SrcReg, unsigned &DstReg,
|
|
unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
|
|
switch (MI.getOpcode()) {
|
|
default:
|
|
return false;
|
|
case SystemZ::MOV32rr:
|
|
case SystemZ::MOV64rr:
|
|
case SystemZ::MOV64rrP:
|
|
case SystemZ::MOV128rr:
|
|
case SystemZ::FMOV32rr:
|
|
case SystemZ::FMOV64rr:
|
|
assert(MI.getNumOperands() >= 2 &&
|
|
MI.getOperand(0).isReg() &&
|
|
MI.getOperand(1).isReg() &&
|
|
"invalid register-register move instruction");
|
|
SrcReg = MI.getOperand(1).getReg();
|
|
DstReg = MI.getOperand(0).getReg();
|
|
SrcSubIdx = MI.getOperand(1).getSubReg();
|
|
DstSubIdx = MI.getOperand(0).getSubReg();
|
|
return true;
|
|
}
|
|
}
|
|
|
|
unsigned SystemZInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
|
|
int &FrameIndex) const {
|
|
switch (MI->getOpcode()) {
|
|
default: break;
|
|
case SystemZ::MOV32rm:
|
|
case SystemZ::MOV32rmy:
|
|
case SystemZ::MOV64rm:
|
|
case SystemZ::MOVSX32rm8:
|
|
case SystemZ::MOVSX32rm16y:
|
|
case SystemZ::MOVSX64rm8:
|
|
case SystemZ::MOVSX64rm16:
|
|
case SystemZ::MOVSX64rm32:
|
|
case SystemZ::MOVZX32rm8:
|
|
case SystemZ::MOVZX32rm16:
|
|
case SystemZ::MOVZX64rm8:
|
|
case SystemZ::MOVZX64rm16:
|
|
case SystemZ::MOVZX64rm32:
|
|
case SystemZ::FMOV32rm:
|
|
case SystemZ::FMOV32rmy:
|
|
case SystemZ::FMOV64rm:
|
|
case SystemZ::FMOV64rmy:
|
|
case SystemZ::MOV64Prm:
|
|
case SystemZ::MOV64Prmy:
|
|
case SystemZ::MOV128rm:
|
|
if (MI->getOperand(1).isFI() &&
|
|
MI->getOperand(2).isImm() && MI->getOperand(3).isReg() &&
|
|
MI->getOperand(2).getImm() == 0 && MI->getOperand(3).getReg() == 0) {
|
|
FrameIndex = MI->getOperand(1).getIndex();
|
|
return MI->getOperand(0).getReg();
|
|
}
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
unsigned SystemZInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
|
|
int &FrameIndex) const {
|
|
switch (MI->getOpcode()) {
|
|
default: break;
|
|
case SystemZ::MOV32mr:
|
|
case SystemZ::MOV32mry:
|
|
case SystemZ::MOV64mr:
|
|
case SystemZ::MOV32m8r:
|
|
case SystemZ::MOV32m8ry:
|
|
case SystemZ::MOV32m16r:
|
|
case SystemZ::MOV32m16ry:
|
|
case SystemZ::MOV64m8r:
|
|
case SystemZ::MOV64m8ry:
|
|
case SystemZ::MOV64m16r:
|
|
case SystemZ::MOV64m16ry:
|
|
case SystemZ::MOV64m32r:
|
|
case SystemZ::MOV64m32ry:
|
|
case SystemZ::FMOV32mr:
|
|
case SystemZ::FMOV32mry:
|
|
case SystemZ::FMOV64mr:
|
|
case SystemZ::FMOV64mry:
|
|
case SystemZ::MOV64Pmr:
|
|
case SystemZ::MOV64Pmry:
|
|
case SystemZ::MOV128mr:
|
|
if (MI->getOperand(0).isFI() &&
|
|
MI->getOperand(1).isImm() && MI->getOperand(2).isReg() &&
|
|
MI->getOperand(1).getImm() == 0 && MI->getOperand(2).getReg() == 0) {
|
|
FrameIndex = MI->getOperand(0).getIndex();
|
|
return MI->getOperand(3).getReg();
|
|
}
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bool SystemZInstrInfo::isInvariantLoad(const MachineInstr *MI) const {
|
|
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
|
|
const MachineOperand &MO = MI->getOperand(i);
|
|
// Loads from constant pools are trivially invariant.
|
|
if (MO.isCPI())
|
|
return true;
|
|
|
|
if (MO.isGlobal())
|
|
return isGVStub(MO.getGlobal(), TM);
|
|
|
|
// If this is a load from an invariant stack slot, the load is a constant.
|
|
if (MO.isFI()) {
|
|
const MachineFrameInfo &MFI =
|
|
*MI->getParent()->getParent()->getFrameInfo();
|
|
int Idx = MO.getIndex();
|
|
return MFI.isFixedObjectIndex(Idx) && MFI.isImmutableObjectIndex(Idx);
|
|
}
|
|
}
|
|
|
|
// All other instances of these instructions are presumed to have other
|
|
// issues.
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
SystemZInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
const std::vector<CalleeSavedInfo> &CSI) const {
|
|
if (CSI.empty())
|
|
return false;
|
|
|
|
DebugLoc DL = DebugLoc::getUnknownLoc();
|
|
if (MI != MBB.end()) DL = MI->getDebugLoc();
|
|
|
|
MachineFunction &MF = *MBB.getParent();
|
|
SystemZMachineFunctionInfo *MFI = MF.getInfo<SystemZMachineFunctionInfo>();
|
|
unsigned CalleeFrameSize = 0;
|
|
|
|
// Scan the callee-saved and find the bounds of register spill area.
|
|
unsigned LowReg = 0, HighReg = 0, StartOffset = -1U, EndOffset = 0;
|
|
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
|
|
unsigned Reg = CSI[i].getReg();
|
|
const TargetRegisterClass *RegClass = CSI[i].getRegClass();
|
|
if (RegClass != &SystemZ::FP64RegClass) {
|
|
unsigned Offset = RegSpillOffsets[Reg];
|
|
CalleeFrameSize += 8;
|
|
if (StartOffset > Offset) {
|
|
LowReg = Reg; StartOffset = Offset;
|
|
}
|
|
if (EndOffset < Offset) {
|
|
HighReg = Reg; EndOffset = RegSpillOffsets[Reg];
|
|
}
|
|
}
|
|
}
|
|
|
|
// Save information for epilogue inserter.
|
|
MFI->setCalleeSavedFrameSize(CalleeFrameSize);
|
|
MFI->setLowReg(LowReg); MFI->setHighReg(HighReg);
|
|
|
|
// Save GPRs
|
|
if (StartOffset) {
|
|
// Build a store instruction. Use STORE MULTIPLE instruction if there are many
|
|
// registers to store, otherwise - just STORE.
|
|
MachineInstrBuilder MIB =
|
|
BuildMI(MBB, MI, DL, get((LowReg == HighReg ?
|
|
SystemZ::MOV64mr : SystemZ::MOV64mrm)));
|
|
|
|
// Add store operands.
|
|
MIB.addReg(SystemZ::R15D).addImm(StartOffset);
|
|
if (LowReg == HighReg)
|
|
MIB.addReg(0);
|
|
MIB.addReg(LowReg, RegState::Kill);
|
|
if (LowReg != HighReg)
|
|
MIB.addReg(HighReg, RegState::Kill);
|
|
|
|
// Do a second scan adding regs as being killed by instruction
|
|
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
|
|
unsigned Reg = CSI[i].getReg();
|
|
// Add the callee-saved register as live-in. It's killed at the spill.
|
|
MBB.addLiveIn(Reg);
|
|
if (Reg != LowReg && Reg != HighReg)
|
|
MIB.addReg(Reg, RegState::ImplicitKill);
|
|
}
|
|
}
|
|
|
|
// Save FPRs
|
|
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
|
|
unsigned Reg = CSI[i].getReg();
|
|
const TargetRegisterClass *RegClass = CSI[i].getRegClass();
|
|
if (RegClass == &SystemZ::FP64RegClass) {
|
|
MBB.addLiveIn(Reg);
|
|
storeRegToStackSlot(MBB, MI, Reg, true, CSI[i].getFrameIdx(), RegClass);
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
SystemZInstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI,
|
|
const std::vector<CalleeSavedInfo> &CSI) const {
|
|
if (CSI.empty())
|
|
return false;
|
|
|
|
DebugLoc DL = DebugLoc::getUnknownLoc();
|
|
if (MI != MBB.end()) DL = MI->getDebugLoc();
|
|
|
|
MachineFunction &MF = *MBB.getParent();
|
|
const TargetRegisterInfo *RegInfo= MF.getTarget().getRegisterInfo();
|
|
SystemZMachineFunctionInfo *MFI = MF.getInfo<SystemZMachineFunctionInfo>();
|
|
|
|
// Restore FP registers
|
|
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
|
|
unsigned Reg = CSI[i].getReg();
|
|
const TargetRegisterClass *RegClass = CSI[i].getRegClass();
|
|
if (RegClass == &SystemZ::FP64RegClass)
|
|
loadRegFromStackSlot(MBB, MI, Reg, CSI[i].getFrameIdx(), RegClass);
|
|
}
|
|
|
|
// Restore GP registers
|
|
unsigned LowReg = MFI->getLowReg(), HighReg = MFI->getHighReg();
|
|
unsigned StartOffset = RegSpillOffsets[LowReg];
|
|
|
|
if (StartOffset) {
|
|
// Build a load instruction. Use LOAD MULTIPLE instruction if there are many
|
|
// registers to load, otherwise - just LOAD.
|
|
MachineInstrBuilder MIB =
|
|
BuildMI(MBB, MI, DL, get((LowReg == HighReg ?
|
|
SystemZ::MOV64rm : SystemZ::MOV64rmm)));
|
|
// Add store operands.
|
|
MIB.addReg(LowReg, RegState::Define);
|
|
if (LowReg != HighReg)
|
|
MIB.addReg(HighReg, RegState::Define);
|
|
|
|
MIB.addReg((RegInfo->hasFP(MF) ? SystemZ::R11D : SystemZ::R15D));
|
|
MIB.addImm(StartOffset);
|
|
if (LowReg == HighReg)
|
|
MIB.addReg(0);
|
|
|
|
// Do a second scan adding regs as being defined by instruction
|
|
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
|
|
unsigned Reg = CSI[i].getReg();
|
|
if (Reg != LowReg && Reg != HighReg)
|
|
MIB.addReg(Reg, RegState::ImplicitDefine);
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool SystemZInstrInfo::
|
|
ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
|
|
assert(Cond.size() == 1 && "Invalid Xbranch condition!");
|
|
|
|
SystemZCC::CondCodes CC = static_cast<SystemZCC::CondCodes>(Cond[0].getImm());
|
|
Cond[0].setImm(getOppositeCondition(CC));
|
|
return false;
|
|
}
|
|
|
|
bool SystemZInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB)const{
|
|
if (MBB.empty()) return false;
|
|
|
|
switch (MBB.back().getOpcode()) {
|
|
case SystemZ::RET: // Return.
|
|
case SystemZ::JMP: // Uncond branch.
|
|
case SystemZ::JMPr: // Indirect branch.
|
|
return true;
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
bool SystemZInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
|
|
const TargetInstrDesc &TID = MI->getDesc();
|
|
if (!TID.isTerminator()) return false;
|
|
|
|
// Conditional branch is a special case.
|
|
if (TID.isBranch() && !TID.isBarrier())
|
|
return true;
|
|
if (!TID.isPredicable())
|
|
return true;
|
|
return !isPredicated(MI);
|
|
}
|
|
|
|
bool SystemZInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
|
|
MachineBasicBlock *&TBB,
|
|
MachineBasicBlock *&FBB,
|
|
SmallVectorImpl<MachineOperand> &Cond,
|
|
bool AllowModify) const {
|
|
// Start from the bottom of the block and work up, examining the
|
|
// terminator instructions.
|
|
MachineBasicBlock::iterator I = MBB.end();
|
|
while (I != MBB.begin()) {
|
|
--I;
|
|
// Working from the bottom, when we see a non-terminator
|
|
// instruction, we're done.
|
|
if (!isUnpredicatedTerminator(I))
|
|
break;
|
|
|
|
// A terminator that isn't a branch can't easily be handled
|
|
// by this analysis.
|
|
if (!I->getDesc().isBranch())
|
|
return true;
|
|
|
|
// Handle unconditional branches.
|
|
if (I->getOpcode() == SystemZ::JMP) {
|
|
if (!AllowModify) {
|
|
TBB = I->getOperand(0).getMBB();
|
|
continue;
|
|
}
|
|
|
|
// If the block has any instructions after a JMP, delete them.
|
|
while (next(I) != MBB.end())
|
|
next(I)->eraseFromParent();
|
|
Cond.clear();
|
|
FBB = 0;
|
|
|
|
// Delete the JMP if it's equivalent to a fall-through.
|
|
if (MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
|
|
TBB = 0;
|
|
I->eraseFromParent();
|
|
I = MBB.end();
|
|
continue;
|
|
}
|
|
|
|
// TBB is used to indicate the unconditinal destination.
|
|
TBB = I->getOperand(0).getMBB();
|
|
continue;
|
|
}
|
|
|
|
// Handle conditional branches.
|
|
SystemZCC::CondCodes BranchCode = getCondFromBranchOpc(I->getOpcode());
|
|
if (BranchCode == SystemZCC::INVALID)
|
|
return true; // Can't handle indirect branch.
|
|
|
|
// Working from the bottom, handle the first conditional branch.
|
|
if (Cond.empty()) {
|
|
FBB = TBB;
|
|
TBB = I->getOperand(0).getMBB();
|
|
Cond.push_back(MachineOperand::CreateImm(BranchCode));
|
|
continue;
|
|
}
|
|
|
|
// Handle subsequent conditional branches. Only handle the case where all
|
|
// conditional branches branch to the same destination.
|
|
assert(Cond.size() == 1);
|
|
assert(TBB);
|
|
|
|
// Only handle the case where all conditional branches branch to
|
|
// the same destination.
|
|
if (TBB != I->getOperand(0).getMBB())
|
|
return true;
|
|
|
|
SystemZCC::CondCodes OldBranchCode = (SystemZCC::CondCodes)Cond[0].getImm();
|
|
// If the conditions are the same, we can leave them alone.
|
|
if (OldBranchCode == BranchCode)
|
|
continue;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
unsigned SystemZInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
|
|
MachineBasicBlock::iterator I = MBB.end();
|
|
unsigned Count = 0;
|
|
|
|
while (I != MBB.begin()) {
|
|
--I;
|
|
if (I->getOpcode() != SystemZ::JMP &&
|
|
getCondFromBranchOpc(I->getOpcode()) == SystemZCC::INVALID)
|
|
break;
|
|
// Remove the branch.
|
|
I->eraseFromParent();
|
|
I = MBB.end();
|
|
++Count;
|
|
}
|
|
|
|
return Count;
|
|
}
|
|
|
|
unsigned
|
|
SystemZInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
|
|
MachineBasicBlock *FBB,
|
|
const SmallVectorImpl<MachineOperand> &Cond) const {
|
|
// FIXME: this should probably have a DebugLoc operand
|
|
DebugLoc dl = DebugLoc::getUnknownLoc();
|
|
// Shouldn't be a fall through.
|
|
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
|
|
assert((Cond.size() == 1 || Cond.size() == 0) &&
|
|
"SystemZ branch conditions have one component!");
|
|
|
|
if (Cond.empty()) {
|
|
// Unconditional branch?
|
|
assert(!FBB && "Unconditional branch with multiple successors!");
|
|
BuildMI(&MBB, dl, get(SystemZ::JMP)).addMBB(TBB);
|
|
return 1;
|
|
}
|
|
|
|
// Conditional branch.
|
|
unsigned Count = 0;
|
|
SystemZCC::CondCodes CC = (SystemZCC::CondCodes)Cond[0].getImm();
|
|
BuildMI(&MBB, dl, getBrCond(CC)).addMBB(TBB);
|
|
++Count;
|
|
|
|
if (FBB) {
|
|
// Two-way Conditional branch. Insert the second branch.
|
|
BuildMI(&MBB, dl, get(SystemZ::JMP)).addMBB(FBB);
|
|
++Count;
|
|
}
|
|
return Count;
|
|
}
|
|
|
|
const TargetInstrDesc&
|
|
SystemZInstrInfo::getBrCond(SystemZCC::CondCodes CC) const {
|
|
switch (CC) {
|
|
default:
|
|
llvm_unreachable("Unknown condition code!");
|
|
case SystemZCC::O: return get(SystemZ::JO);
|
|
case SystemZCC::H: return get(SystemZ::JH);
|
|
case SystemZCC::NLE: return get(SystemZ::JNLE);
|
|
case SystemZCC::L: return get(SystemZ::JL);
|
|
case SystemZCC::NHE: return get(SystemZ::JNHE);
|
|
case SystemZCC::LH: return get(SystemZ::JLH);
|
|
case SystemZCC::NE: return get(SystemZ::JNE);
|
|
case SystemZCC::E: return get(SystemZ::JE);
|
|
case SystemZCC::NLH: return get(SystemZ::JNLH);
|
|
case SystemZCC::HE: return get(SystemZ::JHE);
|
|
case SystemZCC::NL: return get(SystemZ::JNL);
|
|
case SystemZCC::LE: return get(SystemZ::JLE);
|
|
case SystemZCC::NH: return get(SystemZ::JNH);
|
|
case SystemZCC::NO: return get(SystemZ::JNO);
|
|
}
|
|
}
|
|
|
|
SystemZCC::CondCodes
|
|
SystemZInstrInfo::getCondFromBranchOpc(unsigned Opc) const {
|
|
switch (Opc) {
|
|
default: return SystemZCC::INVALID;
|
|
case SystemZ::JO: return SystemZCC::O;
|
|
case SystemZ::JH: return SystemZCC::H;
|
|
case SystemZ::JNLE: return SystemZCC::NLE;
|
|
case SystemZ::JL: return SystemZCC::L;
|
|
case SystemZ::JNHE: return SystemZCC::NHE;
|
|
case SystemZ::JLH: return SystemZCC::LH;
|
|
case SystemZ::JNE: return SystemZCC::NE;
|
|
case SystemZ::JE: return SystemZCC::E;
|
|
case SystemZ::JNLH: return SystemZCC::NLH;
|
|
case SystemZ::JHE: return SystemZCC::HE;
|
|
case SystemZ::JNL: return SystemZCC::NL;
|
|
case SystemZ::JLE: return SystemZCC::LE;
|
|
case SystemZ::JNH: return SystemZCC::NH;
|
|
case SystemZ::JNO: return SystemZCC::NO;
|
|
}
|
|
}
|
|
|
|
SystemZCC::CondCodes
|
|
SystemZInstrInfo::getOppositeCondition(SystemZCC::CondCodes CC) const {
|
|
switch (CC) {
|
|
default:
|
|
llvm_unreachable("Invalid condition!");
|
|
case SystemZCC::O: return SystemZCC::NO;
|
|
case SystemZCC::H: return SystemZCC::NH;
|
|
case SystemZCC::NLE: return SystemZCC::LE;
|
|
case SystemZCC::L: return SystemZCC::NL;
|
|
case SystemZCC::NHE: return SystemZCC::HE;
|
|
case SystemZCC::LH: return SystemZCC::NLH;
|
|
case SystemZCC::NE: return SystemZCC::E;
|
|
case SystemZCC::E: return SystemZCC::NE;
|
|
case SystemZCC::NLH: return SystemZCC::LH;
|
|
case SystemZCC::HE: return SystemZCC::NHE;
|
|
case SystemZCC::NL: return SystemZCC::L;
|
|
case SystemZCC::LE: return SystemZCC::NLE;
|
|
case SystemZCC::NH: return SystemZCC::H;
|
|
case SystemZCC::NO: return SystemZCC::O;
|
|
}
|
|
}
|
|
|
|
const TargetInstrDesc&
|
|
SystemZInstrInfo::getLongDispOpc(unsigned Opc) const {
|
|
switch (Opc) {
|
|
default:
|
|
llvm_unreachable("Don't have long disp version of this instruction");
|
|
case SystemZ::MOV32mr: return get(SystemZ::MOV32mry);
|
|
case SystemZ::MOV32rm: return get(SystemZ::MOV32rmy);
|
|
case SystemZ::MOVSX32rm16: return get(SystemZ::MOVSX32rm16y);
|
|
case SystemZ::MOV32m8r: return get(SystemZ::MOV32m8ry);
|
|
case SystemZ::MOV32m16r: return get(SystemZ::MOV32m16ry);
|
|
case SystemZ::MOV64m8r: return get(SystemZ::MOV64m8ry);
|
|
case SystemZ::MOV64m16r: return get(SystemZ::MOV64m16ry);
|
|
case SystemZ::MOV64m32r: return get(SystemZ::MOV64m32ry);
|
|
case SystemZ::MOV8mi: return get(SystemZ::MOV8miy);
|
|
case SystemZ::MUL32rm: return get(SystemZ::MUL32rmy);
|
|
case SystemZ::CMP32rm: return get(SystemZ::CMP32rmy);
|
|
case SystemZ::UCMP32rm: return get(SystemZ::UCMP32rmy);
|
|
case SystemZ::FMOV32mr: return get(SystemZ::FMOV32mry);
|
|
case SystemZ::FMOV64mr: return get(SystemZ::FMOV64mry);
|
|
case SystemZ::FMOV32rm: return get(SystemZ::FMOV32rmy);
|
|
case SystemZ::FMOV64rm: return get(SystemZ::FMOV64rmy);
|
|
case SystemZ::MOV64Pmr: return get(SystemZ::MOV64Pmry);
|
|
case SystemZ::MOV64Prm: return get(SystemZ::MOV64Prmy);
|
|
}
|
|
}
|