//
// The constants can be not just numbers but addresses of functions and labels.
// This can be particularly helpful in static relocation mode for embedded
-// non linux targets.
+// non-linux targets.
//
//
-#define DEBUG_TYPE "mips-constant-islands"
-
#include "Mips.h"
#include "MCTargetDesc/MipsBaseInfo.h"
+#include "Mips16InstrInfo.h"
#include "MipsMachineFunction.h"
#include "MipsTargetMachine.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Function.h"
+#include "llvm/IR/InstIterator.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/InstIterator.h"
+#include "llvm/Support/Format.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Support/Format.h"
#include <algorithm>
using namespace llvm;
+#define DEBUG_TYPE "mips-constant-islands"
+
STATISTIC(NumCPEs, "Number of constpool entries");
STATISTIC(NumSplit, "Number of uncond branches inserted");
STATISTIC(NumCBrFixed, "Number of cond branches fixed");
cl::desc("Make small offsets be this amount for testing purposes"),
cl::Hidden);
+//
+// For testing purposes we tell it to not use relaxed load forms so that it
+// will split blocks.
+//
+static cl::opt<bool> NoLoadRelaxation(
+ "mips-constant-islands-no-load-relaxation",
+ cl::init(false),
+ cl::desc("Don't relax loads to long loads - for testing purposes"),
+ cl::Hidden);
+
+static unsigned int branchTargetOperand(MachineInstr *MI) {
+ switch (MI->getOpcode()) {
+ case Mips::Bimm16:
+ case Mips::BimmX16:
+ case Mips::Bteqz16:
+ case Mips::BteqzX16:
+ case Mips::Btnez16:
+ case Mips::BtnezX16:
+ case Mips::JalB16:
+ return 0;
+ case Mips::BeqzRxImm16:
+ case Mips::BeqzRxImmX16:
+ case Mips::BnezRxImm16:
+ case Mips::BnezRxImmX16:
+ return 1;
+ }
+ llvm_unreachable("Unknown branch type");
+}
+
+static bool isUnconditionalBranch(unsigned int Opcode) {
+ switch (Opcode) {
+ default: return false;
+ case Mips::Bimm16:
+ case Mips::BimmX16:
+ case Mips::JalB16:
+ return true;
+ }
+}
+
+static unsigned int longformBranchOpcode(unsigned int Opcode) {
+ switch (Opcode) {
+ case Mips::Bimm16:
+ case Mips::BimmX16:
+ return Mips::BimmX16;
+ case Mips::Bteqz16:
+ case Mips::BteqzX16:
+ return Mips::BteqzX16;
+ case Mips::Btnez16:
+ case Mips::BtnezX16:
+ return Mips::BtnezX16;
+ case Mips::JalB16:
+ return Mips::JalB16;
+ case Mips::BeqzRxImm16:
+ case Mips::BeqzRxImmX16:
+ return Mips::BeqzRxImmX16;
+ case Mips::BnezRxImm16:
+ case Mips::BnezRxImmX16:
+ return Mips::BnezRxImmX16;
+ }
+ llvm_unreachable("Unknown branch type");
+}
+
+//
+// FIXME: need to go through this whole constant islands port and check the math
+// for branch ranges and clean this up and make some functions to calculate things
+// that are done many times identically.
+// Need to refactor some of the code to call this routine.
+//
+static unsigned int branchMaxOffsets(unsigned int Opcode) {
+ unsigned Bits, Scale;
+ switch (Opcode) {
+ case Mips::Bimm16:
+ Bits = 11;
+ Scale = 2;
+ break;
+ case Mips::BimmX16:
+ Bits = 16;
+ Scale = 2;
+ break;
+ case Mips::BeqzRxImm16:
+ Bits = 8;
+ Scale = 2;
+ break;
+ case Mips::BeqzRxImmX16:
+ Bits = 16;
+ Scale = 2;
+ break;
+ case Mips::BnezRxImm16:
+ Bits = 8;
+ Scale = 2;
+ break;
+ case Mips::BnezRxImmX16:
+ Bits = 16;
+ Scale = 2;
+ break;
+ case Mips::Bteqz16:
+ Bits = 8;
+ Scale = 2;
+ break;
+ case Mips::BteqzX16:
+ Bits = 16;
+ Scale = 2;
+ break;
+ case Mips::Btnez16:
+ Bits = 8;
+ Scale = 2;
+ break;
+ case Mips::BtnezX16:
+ Bits = 16;
+ Scale = 2;
+ break;
+ default:
+ llvm_unreachable("Unknown branch type");
+ }
+ unsigned MaxOffs = ((1 << (Bits-1))-1) * Scale;
+ return MaxOffs;
+}
namespace {
ConstantIslandsSmallOffset: MaxDisp;
return xMaxDisp;
}
+ void setMaxDisp(unsigned val) {
+ MaxDisp = val;
+ }
unsigned getLongFormMaxDisp() const {
return LongFormMaxDisp;
}
const TargetMachine &TM;
bool IsPIC;
- unsigned ABI;
const MipsSubtarget *STI;
- const MipsInstrInfo *TII;
+ const Mips16InstrInfo *TII;
MipsFunctionInfo *MFI;
MachineFunction *MF;
MachineConstantPool *MCP;
public:
static char ID;
MipsConstantIslands(TargetMachine &tm)
- : MachineFunctionPass(ID), TM(tm),
- IsPIC(TM.getRelocationModel() == Reloc::PIC_),
- ABI(TM.getSubtarget<MipsSubtarget>().getTargetABI()),
- STI(&TM.getSubtarget<MipsSubtarget>()), MF(0), MCP(0),
- PrescannedForConstants(false){}
+ : MachineFunctionPass(ID), TM(tm),
+ IsPIC(TM.getRelocationModel() == Reloc::PIC_), STI(nullptr),
+ MF(nullptr), MCP(nullptr), PrescannedForConstants(false) {}
- virtual const char *getPassName() const {
+ const char *getPassName() const override {
return "Mips Constant Islands";
}
- bool runOnMachineFunction(MachineFunction &F);
+ bool runOnMachineFunction(MachineFunction &F) override;
void doInitialPlacement(std::vector<MachineInstr*> &CPEMIs);
CPEntry *findConstPoolEntry(unsigned CPI, const MachineInstr *CPEMI);
unsigned getOffsetOf(MachineInstr *MI) const;
unsigned getUserOffset(CPUser&) const;
void dumpBBs();
- void verify();
bool isOffsetInRange(unsigned UserOffset, unsigned TrialOffset,
unsigned Disp, bool NegativeOK);
bool isOffsetInRange(unsigned UserOffset, unsigned TrialOffset,
const CPUser &U);
- bool isLongFormOffsetInRange(unsigned UserOffset, unsigned TrialOffset,
- const CPUser &U);
-
void computeBlockSize(MachineBasicBlock *MBB);
MachineBasicBlock *splitBlockBeforeInstr(MachineInstr *MI);
void updateForInsertedWaterBlock(MachineBasicBlock *NewBB);
char MipsConstantIslands::ID = 0;
} // end of anonymous namespace
-
-bool MipsConstantIslands::isLongFormOffsetInRange
- (unsigned UserOffset, unsigned TrialOffset,
- const CPUser &U) {
- return isOffsetInRange(UserOffset, TrialOffset,
- U.getLongFormMaxDisp(), U.NegOk);
-}
-
bool MipsConstantIslands::isOffsetInRange
(unsigned UserOffset, unsigned TrialOffset,
const CPUser &U) {
// FIXME:
MF = &mf;
MCP = mf.getConstantPool();
+ STI = &mf.getTarget().getSubtarget<MipsSubtarget>();
DEBUG(dbgs() << "constant island machine function " << "\n");
- if (!TM.getSubtarget<MipsSubtarget>().inMips16Mode() ||
- !MipsSubtarget::useConstantIslands()) {
+ if (!STI->inMips16Mode() || !MipsSubtarget::useConstantIslands()) {
return false;
}
- TII = (const MipsInstrInfo*)MF->getTarget().getInstrInfo();
+ TII = (const Mips16InstrInfo *)MF->getTarget()
+ .getSubtargetImpl()
+ ->getInstrInfo();
MFI = MF->getInfo<MipsFunctionInfo>();
DEBUG(dbgs() << "constant island processing " << "\n");
//
DEBUG(dbgs() << "Beginning BR iteration #" << NoBRIters << '\n');
bool BRChange = false;
-#ifdef IN_PROGRESS
for (unsigned i = 0, e = ImmBranches.size(); i != e; ++i)
BRChange |= fixupImmediateBr(ImmBranches[i]);
if (BRChange && ++NoBRIters > 30)
report_fatal_error("Branch Fix Up pass failed to converge!");
DEBUG(dumpBBs());
-#endif
if (!CPChange && !BRChange)
break;
MadeChange = true;
// identity mapping of CPI's to CPE's.
const std::vector<MachineConstantPoolEntry> &CPs = MCP->getConstants();
- const DataLayout &TD = *MF->getTarget().getDataLayout();
+ const DataLayout &TD = *MF->getSubtarget().getDataLayout();
for (unsigned i = 0, e = CPs.size(); i != e; ++i) {
unsigned Size = TD.getTypeAllocSize(CPs[i].getType());
assert(Size >= 4 && "Too small constant pool entry");
if (InsPoint[a] == InsAt)
InsPoint[a] = CPEMI;
// Add a new CPEntry, but no corresponding CPUser yet.
- std::vector<CPEntry> CPEs;
- CPEs.push_back(CPEntry(CPEMI, i));
- CPEntries.push_back(CPEs);
+ CPEntries.emplace_back(1, CPEntry(CPEMI, i));
++NumCPEs;
DEBUG(dbgs() << "Moved CPI#" << i << " to end of function, size = "
<< Size << ", align = " << Align <<'\n');
// Get the next machine basic block in the function.
MachineFunction::iterator MBBI = MBB;
// Can't fall off end of function.
- if (llvm::next(MBBI) == MBB->getParent()->end())
+ if (std::next(MBBI) == MBB->getParent()->end())
return false;
- MachineBasicBlock *NextBB = llvm::next(MBBI);
+ MachineBasicBlock *NextBB = std::next(MBBI);
for (MachineBasicBlock::succ_iterator I = MBB->succ_begin(),
E = MBB->succ_end(); I != E; ++I)
if (*I == NextBB)
if (CPEs[i].CPEMI == CPEMI)
return &CPEs[i];
}
- return NULL;
+ return nullptr;
}
/// getCPELogAlign - Returns the required alignment of the constant pool entry
unsigned Bits = 0;
unsigned Scale = 1;
int UOpc = Opc;
-
switch (Opc) {
default:
- continue; // Ignore other JT branches
+ continue; // Ignore other branches for now
+ case Mips::Bimm16:
+ Bits = 11;
+ Scale = 2;
+ isCond = false;
+ break;
+ case Mips::BimmX16:
+ Bits = 16;
+ Scale = 2;
+ isCond = false;
+ break;
+ case Mips::BeqzRxImm16:
+ UOpc=Mips::Bimm16;
+ Bits = 8;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::BeqzRxImmX16:
+ UOpc=Mips::Bimm16;
+ Bits = 16;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::BnezRxImm16:
+ UOpc=Mips::Bimm16;
+ Bits = 8;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::BnezRxImmX16:
+ UOpc=Mips::Bimm16;
+ Bits = 16;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::Bteqz16:
+ UOpc=Mips::Bimm16;
+ Bits = 8;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::BteqzX16:
+ UOpc=Mips::Bimm16;
+ Bits = 16;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::Btnez16:
+ UOpc=Mips::Bimm16;
+ Bits = 8;
+ Scale = 2;
+ isCond = true;
+ break;
+ case Mips::BtnezX16:
+ UOpc=Mips::Bimm16;
+ Bits = 16;
+ Scale = 2;
+ isCond = true;
+ break;
}
// Record this immediate branch.
unsigned MaxOffs = ((1 << (Bits-1))-1) * Scale;
ImmBranches.push_back(ImmBranch(I, MaxOffs, isCond, UOpc));
-
}
-
if (Opc == Mips::CONSTPOOL_ENTRY)
continue;
llvm_unreachable("Unknown addressing mode for CP reference!");
case Mips::LwRxPcTcp16:
Bits = 8;
- Scale = 2;
+ Scale = 4;
LongFormOpcode = Mips::LwRxPcTcpX16;
+ LongFormBits = 14;
+ LongFormScale = 1;
break;
case Mips::LwRxPcTcpX16:
- Bits = 16;
- Scale = 2;
+ Bits = 14;
+ Scale = 1;
+ NegOk = true;
break;
}
// Remember that this is a user of a CP entry.
// Note the new unconditional branch is not being recorded.
// There doesn't seem to be meaningful DebugInfo available; this doesn't
// correspond to anything in the source.
- BuildMI(OrigBB, DebugLoc(), TII->get(Mips::BimmX16)).addMBB(NewBB);
+ BuildMI(OrigBB, DebugLoc(), TII->get(Mips::Bimm16)).addMBB(NewBB);
++NumSplit;
// Update the CFG. All succs of OrigBB are now succs of NewBB.
CompareMBBNumbers);
MachineBasicBlock* WaterBB = *IP;
if (WaterBB == OrigBB)
- WaterList.insert(llvm::next(IP), NewBB);
+ WaterList.insert(std::next(IP), NewBB);
else
WaterList.insert(IP, OrigBB);
NewWaterList.insert(OrigBB);
/// isOffsetInRange - Checks whether UserOffset (the location of a constant pool
/// reference) is within MaxDisp of TrialOffset (a proposed location of a
/// constant pool entry).
-/// UserOffset is computed by getUserOffset above to include PC adjustments. If
-/// the mod 4 alignment of UserOffset is not known, the uncertainty must be
-/// subtracted from MaxDisp instead. CPUser::getMaxDisp() does that.
bool MipsConstantIslands::isOffsetInRange(unsigned UserOffset,
unsigned TrialOffset, unsigned MaxDisp,
bool NegativeOK) {
MachineBasicBlock *Succ = *MBB->succ_begin();
MachineBasicBlock *Pred = *MBB->pred_begin();
MachineInstr *PredMI = &Pred->back();
- if (PredMI->getOpcode() == Mips::BimmX16)
+ if (PredMI->getOpcode() == Mips::Bimm16)
return PredMI->getOperand(0).getMBB() == Succ;
return false;
}
assert(CPE && "Unexpected!");
if (--CPE->RefCount == 0) {
removeDeadCPEMI(CPEMI);
- CPE->CPEMI = NULL;
+ CPE->CPEMI = nullptr;
--NumCPEs;
return true;
}
if (CPEs[i].CPEMI == CPEMI)
continue;
// Removing CPEs can leave empty entries, skip
- if (CPEs[i].CPEMI == NULL)
+ if (CPEs[i].CPEMI == nullptr)
continue;
if (isCPEntryInRange(UserMI, UserOffset, CPEs[i].CPEMI, U.getMaxDisp(),
U.NegOk)) {
true)) {
DEBUG(dbgs() << "In range\n");
UserMI->setDesc(TII->get(U.getLongFormOpcode()));
+ U.setMaxDisp(U.getLongFormMaxDisp());
return 2; // instruction is longer length now
}
if (CPEs[i].CPEMI == CPEMI)
continue;
// Removing CPEs can leave empty entries, skip
- if (CPEs[i].CPEMI == NULL)
+ if (CPEs[i].CPEMI == nullptr)
continue;
if (isCPEntryInRange(UserMI, UserOffset, CPEs[i].CPEMI,
U.getLongFormMaxDisp(), U.NegOk)) {
/// the specific unconditional branch instruction.
static inline unsigned getUnconditionalBrDisp(int Opc) {
switch (Opc) {
+ case Mips::Bimm16:
+ return ((1<<10)-1)*2;
case Mips::BimmX16:
return ((1<<16)-1)*2;
default:
return false;
unsigned BestGrowth = ~0u;
- for (water_iterator IP = prior(WaterList.end()), B = WaterList.begin();;
+ for (water_iterator IP = std::prev(WaterList.end()), B = WaterList.begin();;
--IP) {
MachineBasicBlock* WaterBB = *IP;
// Check if water is in range and is either at a lower address than the
if (isOffsetInRange(UserOffset, CPEOffset, U)) {
DEBUG(dbgs() << "Split at end of BB#" << UserMBB->getNumber()
<< format(", expected CPE offset %#x\n", CPEOffset));
- NewMBB = llvm::next(MachineFunction::iterator(UserMBB));
+ NewMBB = std::next(MachineFunction::iterator(UserMBB));
// Add an unconditional branch from UserMBB to fallthrough block. Record
// it for branch lengthening; this new branch will not get out of range,
// but if the preceding conditional branch is out of range, the targets
// will be exchanged, and the altered branch may be out of range, so the
// machinery has to know about it.
- int UncondBr = Mips::BimmX16;
+ int UncondBr = Mips::Bimm16;
BuildMI(UserMBB, DebugLoc(), TII->get(UncondBr)).addMBB(NewMBB);
unsigned MaxDisp = getUnconditionalBrDisp(UncondBr);
ImmBranches.push_back(ImmBranch(&UserMBB->back(),
//MachineInstr *LastIT = 0;
for (unsigned Offset = UserOffset+TII->GetInstSizeInBytes(UserMI);
Offset < BaseInsertOffset;
- Offset += TII->GetInstSizeInBytes(MI),
- MI = llvm::next(MI)) {
+ Offset += TII->GetInstSizeInBytes(MI), MI = std::next(MI)) {
assert(MI != UserMBB->end() && "Fell off end of block");
if (CPUIndex < NumCPUsers && CPUsers[CPUIndex].MI == MI) {
CPUser &U = CPUsers[CPUIndex];
NewWaterList.insert(NewIsland);
// The new CPE goes before the following block (NewMBB).
- NewMBB = llvm::next(MachineFunction::iterator(WaterBB));
+ NewMBB = std::next(MachineFunction::iterator(WaterBB));
} else {
// No water found.
// we first see if a longer form of the instrucion could have reached
// the constant. in that case we won't bother to split
-#ifdef IN_PROGRESS
- result = findLongFormInRangeCPEntry(U, UserOffset);
-#endif
+ if (!NoLoadRelaxation) {
+ result = findLongFormInRangeCPEntry(U, UserOffset);
+ if (result != 0) return true;
+ }
DEBUG(dbgs() << "No water found\n");
createNewWater(CPUserIndex, UserOffset, NewMBB);
// next iteration for constant pools, but in this context, we don't want
// it. Check for this so it will be removed from the WaterList.
// Also remove any entry from NewWaterList.
- MachineBasicBlock *WaterBB = prior(MachineFunction::iterator(NewMBB));
+ MachineBasicBlock *WaterBB = std::prev(MachineFunction::iterator(NewMBB));
IP = std::find(WaterList.begin(), WaterList.end(), WaterBB);
if (IP != WaterList.end())
NewWaterList.erase(WaterBB);
// Decrement the old entry, and remove it if refcount becomes 0.
decrementCPEReferenceCount(CPI, CPEMI);
+ // No existing clone of this CPE is within range.
+ // We will be generating a new clone. Get a UID for it.
+ unsigned ID = createPICLabelUId();
+
// Now that we have an island to add the CPE to, clone the original CPE and
// add it to the island.
U.HighWaterMark = NewIsland;
// Increase the size of the island block to account for the new entry.
BBInfo[NewIsland->getNumber()].Size += Size;
- adjustBBOffsetsAfter(llvm::prior(MachineFunction::iterator(NewIsland)));
+ adjustBBOffsetsAfter(std::prev(MachineFunction::iterator(NewIsland)));
+
- // No existing clone of this CPE is within range.
- // We will be generating a new clone. Get a UID for it.
- unsigned ID = createPICLabelUId();
// Finally, change the CPI in the instruction operand to be ID.
for (unsigned i = 0, e = UserMI->getNumOperands(); i != e; ++i)
for (unsigned j = 0, ee = CPEs.size(); j != ee; ++j) {
if (CPEs[j].RefCount == 0 && CPEs[j].CPEMI) {
removeDeadCPEMI(CPEs[j].CPEMI);
- CPEs[j].CPEMI = NULL;
+ CPEs[j].CPEMI = nullptr;
MadeChange = true;
}
}
/// away to fit in its displacement field.
bool MipsConstantIslands::fixupImmediateBr(ImmBranch &Br) {
MachineInstr *MI = Br.MI;
- MachineBasicBlock *DestBB = MI->getOperand(0).getMBB();
+ unsigned TargetOperand = branchTargetOperand(MI);
+ MachineBasicBlock *DestBB = MI->getOperand(TargetOperand).getMBB();
// Check to see if the DestBB is already in-range.
if (isBBInRange(MI, DestBB, Br.MaxDisp))
MipsConstantIslands::fixupUnconditionalBr(ImmBranch &Br) {
MachineInstr *MI = Br.MI;
MachineBasicBlock *MBB = MI->getParent();
+ MachineBasicBlock *DestBB = MI->getOperand(0).getMBB();
// Use BL to implement far jump.
- Br.MaxDisp = ((1 << 16)-1) * 2;
- MI->setDesc(TII->get(Mips::BimmX16));
+ unsigned BimmX16MaxDisp = ((1 << 16)-1) * 2;
+ if (isBBInRange(MI, DestBB, BimmX16MaxDisp)) {
+ Br.MaxDisp = BimmX16MaxDisp;
+ MI->setDesc(TII->get(Mips::BimmX16));
+ }
+ else {
+ // need to give the math a more careful look here
+ // this is really a segment address and not
+ // a PC relative address. FIXME. But I think that
+ // just reducing the bits by 1 as I've done is correct.
+ // The basic block we are branching too much be longword aligned.
+ // we know that RA is saved because we always save it right now.
+ // this requirement will be relaxed later but we also have an alternate
+ // way to implement this that I will implement that does not need jal.
+ // We should have a way to back out this alignment restriction if we "can" later.
+ // but it is not harmful.
+ //
+ DestBB->setAlignment(2);
+ Br.MaxDisp = ((1<<24)-1) * 2;
+ MI->setDesc(TII->get(Mips::JalB16));
+ }
BBInfo[MBB->getNumber()].Size += 2;
adjustBBOffsetsAfter(MBB);
HasFarJump = true;
return true;
}
+
/// fixupConditionalBr - Fix up a conditional branch whose destination is too
/// far away to fit in its displacement field. It is converted to an inverse
/// conditional branch + an unconditional branch to the destination.
bool
MipsConstantIslands::fixupConditionalBr(ImmBranch &Br) {
MachineInstr *MI = Br.MI;
- MachineBasicBlock *DestBB = MI->getOperand(0).getMBB();
+ unsigned TargetOperand = branchTargetOperand(MI);
+ MachineBasicBlock *DestBB = MI->getOperand(TargetOperand).getMBB();
+ unsigned Opcode = MI->getOpcode();
+ unsigned LongFormOpcode = longformBranchOpcode(Opcode);
+ unsigned LongFormMaxOff = branchMaxOffsets(LongFormOpcode);
+
+ // Check to see if the DestBB is already in-range.
+ if (isBBInRange(MI, DestBB, LongFormMaxOff)) {
+ Br.MaxDisp = LongFormMaxOff;
+ MI->setDesc(TII->get(LongFormOpcode));
+ return true;
+ }
// Add an unconditional branch to the destination and invert the branch
// condition to jump over it:
- // blt L1
+ // bteqz L1
// =>
- // bge L2
+ // bnez L2
// b L1
// L2:
- unsigned CCReg = 0; // FIXME
- unsigned CC=0; //FIXME
// If the branch is at the end of its MBB and that has a fall-through block,
// direct the updated conditional branch to the fall-through block. Otherwise,
MachineBasicBlock *MBB = MI->getParent();
MachineInstr *BMI = &MBB->back();
bool NeedSplit = (BMI != MI) || !BBHasFallthrough(MBB);
-
+ unsigned OppositeBranchOpcode = TII->getOppositeBranchOpc(Opcode);
+
++NumCBrFixed;
if (BMI != MI) {
- if (llvm::next(MachineBasicBlock::iterator(MI)) == prior(MBB->end()) &&
- BMI->getOpcode() == Br.UncondBr) {
+ if (std::next(MachineBasicBlock::iterator(MI)) == std::prev(MBB->end()) &&
+ isUnconditionalBranch(BMI->getOpcode())) {
// Last MI in the BB is an unconditional branch. Can we simply invert the
// condition and swap destinations:
- // beq L1
+ // beqz L1
// b L2
// =>
- // bne L2
+ // bnez L2
// b L1
- MachineBasicBlock *NewDest = BMI->getOperand(0).getMBB();
+ unsigned BMITargetOperand = branchTargetOperand(BMI);
+ MachineBasicBlock *NewDest =
+ BMI->getOperand(BMITargetOperand).getMBB();
if (isBBInRange(MI, NewDest, Br.MaxDisp)) {
DEBUG(dbgs() << " Invert Bcc condition and swap its destination with "
<< *BMI);
- BMI->getOperand(0).setMBB(DestBB);
- MI->getOperand(0).setMBB(NewDest);
+ MI->setDesc(TII->get(OppositeBranchOpcode));
+ BMI->getOperand(BMITargetOperand).setMBB(DestBB);
+ MI->getOperand(TargetOperand).setMBB(NewDest);
return true;
}
}
}
+
if (NeedSplit) {
splitBlockBeforeInstr(MI);
// No need for the branch to the next block. We're adding an unconditional
MBB->back().eraseFromParent();
// BBInfo[SplitBB].Offset is wrong temporarily, fixed below
}
- MachineBasicBlock *NextBB = llvm::next(MachineFunction::iterator(MBB));
+ MachineBasicBlock *NextBB = std::next(MachineFunction::iterator(MBB));
DEBUG(dbgs() << " Insert B to BB#" << DestBB->getNumber()
<< " also invert condition and change dest. to BB#"
// Insert a new conditional branch and a new unconditional branch.
// Also update the ImmBranch as well as adding a new entry for the new branch.
- BuildMI(MBB, DebugLoc(), TII->get(MI->getOpcode()))
- .addMBB(NextBB).addImm(CC).addReg(CCReg);
+ if (MI->getNumExplicitOperands() == 2) {
+ BuildMI(MBB, DebugLoc(), TII->get(OppositeBranchOpcode))
+ .addReg(MI->getOperand(0).getReg())
+ .addMBB(NextBB);
+ } else {
+ BuildMI(MBB, DebugLoc(), TII->get(OppositeBranchOpcode))
+ .addMBB(NextBB);
+ }
Br.MI = &MBB->back();
BBInfo[MBB->getNumber()].Size += TII->GetInstSizeInBytes(&MBB->back());
BuildMI(MBB, DebugLoc(), TII->get(Br.UncondBr)).addMBB(DestBB);
void MipsConstantIslands::prescanForConstants() {
unsigned J = 0;
(void)J;
- PrescannedForConstants = true;
for (MachineFunction::iterator B =
MF->begin(), E = MF->end(); B != E; ++B) {
for (MachineBasicBlock::instr_iterator I =
B->instr_begin(), EB = B->instr_end(); I != EB; ++I) {
switch(I->getDesc().getOpcode()) {
case Mips::LwConstant32: {
+ PrescannedForConstants = true;
DEBUG(dbgs() << "constant island constant " << *I << "\n");
J = I->getNumOperands();
DEBUG(dbgs() << "num operands " << J << "\n");
projects / oota-llvm.git / blobdiff