unsigned getNumConflictsWithPhysReg(const LiveInterval &li,
unsigned PhysReg) const;
+ /// processImplicitDefs - Process IMPLICIT_DEF instructions. Add isUndef
+ /// marker to implicit_def defs and their uses.
+ void processImplicitDefs();
+
/// computeNumbering - Compute the index numbering.
void computeNumbering();
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/ADT/DepthFirstIterator.h"
+#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include <algorithm>
}
}
+/// processImplicitDefs - Process IMPLICIT_DEF instructions and make sure
+/// there is one implicit_def for each use. Add isUndef marker to
+/// implicit_def defs and their uses.
+void LiveIntervals::processImplicitDefs() {
+ SmallSet<unsigned, 8> ImpDefRegs;
+ SmallVector<MachineInstr*, 8> ImpDefMIs;
+ MachineBasicBlock *Entry = mf_->begin();
+ SmallPtrSet<MachineBasicBlock*,16> Visited;
+ for (df_ext_iterator<MachineBasicBlock*, SmallPtrSet<MachineBasicBlock*,16> >
+ DFI = df_ext_begin(Entry, Visited), E = df_ext_end(Entry, Visited);
+ DFI != E; ++DFI) {
+ MachineBasicBlock *MBB = *DFI;
+ for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
+ I != E; ) {
+ MachineInstr *MI = &*I;
+ ++I;
+ if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
+ unsigned Reg = MI->getOperand(0).getReg();
+ MI->getOperand(0).setIsUndef();
+ ImpDefRegs.insert(Reg);
+ ImpDefMIs.push_back(MI);
+ continue;
+ }
+ for (unsigned i = 0; i != MI->getNumOperands(); ++i) {
+ MachineOperand& MO = MI->getOperand(i);
+ if (!MO.isReg() || !MO.isUse())
+ continue;
+ unsigned Reg = MO.getReg();
+ if (!Reg)
+ continue;
+ if (!ImpDefRegs.count(Reg))
+ continue;
+ MO.setIsUndef();
+ if (MO.isKill() || MI->isRegTiedToDefOperand(i))
+ ImpDefRegs.erase(Reg);
+ }
+
+ for (unsigned i = 0; i != MI->getNumOperands(); ++i) {
+ MachineOperand& MO = MI->getOperand(i);
+ if (!MO.isReg() || !MO.isDef())
+ continue;
+ ImpDefRegs.erase(MO.getReg());
+ }
+ }
+
+ // Any outstanding liveout implicit_def's?
+ for (unsigned i = 0, e = ImpDefMIs.size(); i != e; ++i) {
+ MachineInstr *MI = ImpDefMIs[i];
+ unsigned Reg = MI->getOperand(0).getReg();
+ if (TargetRegisterInfo::isPhysicalRegister(Reg))
+ // Physical registers are not liveout (yet).
+ continue;
+ if (!ImpDefRegs.count(Reg))
+ continue;
+ bool HasLocalUse = false;
+ for (MachineRegisterInfo::reg_iterator RI = mri_->reg_begin(Reg),
+ RE = mri_->reg_end(); RI != RE; ) {
+ MachineOperand &RMO = RI.getOperand();
+ MachineInstr *RMI = &*RI;
+ ++RI;
+ if (RMO.isDef()) {
+ // Don't expect another def of the same register.
+ assert(RMI == MI &&
+ "Register with multiple defs including an implicit_def?");
+ continue;
+ }
+ MachineBasicBlock *RMBB = RMI->getParent();
+ if (RMBB == MBB) {
+ HasLocalUse = true;
+ continue;
+ }
+ const TargetRegisterClass* RC = mri_->getRegClass(Reg);
+ unsigned NewVReg = mri_->createVirtualRegister(RC);
+ BuildMI(*RMBB, RMI, RMI->getDebugLoc(),
+ tii_->get(TargetInstrInfo::IMPLICIT_DEF), NewVReg);
+ RMO.setReg(NewVReg);
+ RMO.setIsUndef();
+ RMO.setIsKill();
+ }
+ if (!HasLocalUse)
+ MI->eraseFromParent();
+ }
+ ImpDefRegs.clear();
+ ImpDefMIs.clear();
+ }
+}
+
void LiveIntervals::computeNumbering() {
Index2MiMap OldI2MI = i2miMap_;
std::vector<IdxMBBPair> OldI2MBB = Idx2MBBMap;
lv_ = &getAnalysis<LiveVariables>();
allocatableRegs_ = tri_->getAllocatableSet(fn);
+ processImplicitDefs();
computeNumbering();
computeIntervals();
if (MO.isReg() && MO.getReg() == li.reg) {
MO.setReg(NewVReg);
MO.setIsUndef();
- if (MO.isKill())
- MO.setIsKill(false);
}
}
}
if (!isPhys && vrm_->getPreSplitReg(cur.reg))
continue;
- // A register defined by an implicit_def can be liveout the def BB and livein
- // to a use BB. Add it to the livein set of the use BB's.
- if (!isPhys && cur.empty()) {
- if (MachineInstr *DefMI = mri_->getVRegDef(cur.reg)) {
- assert(DefMI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF);
- MachineBasicBlock *DefMBB = DefMI->getParent();
- SmallPtrSet<MachineBasicBlock*, 4> Seen;
- Seen.insert(DefMBB);
- for (MachineRegisterInfo::reg_iterator ri = mri_->reg_begin(cur.reg),
- re = mri_->reg_end(); ri != re; ++ri) {
- MachineInstr *UseMI = &*ri;
- MachineBasicBlock *UseMBB = UseMI->getParent();
- if (Seen.insert(UseMBB)) {
- assert(TargetRegisterInfo::isPhysicalRegister(Reg) &&
- "Adding a virtual register to livein set?");
- UseMBB->addLiveIn(Reg);
- }
- }
- }
- }
for (LiveInterval::Ranges::const_iterator I = cur.begin(), E = cur.end();
I != E; ++I) {
const LiveRange &LR = *I;
DOUT << tri_->getName(physReg) << '\n';
// Note the register is not really in use.
vrm_->assignVirt2Phys(cur->reg, physReg);
- // Since the register allocator is allowed to assign this virtual register
- // physical register that overlaps other live intervals. Mark these
- // operands as "Undef" which means later passes, e.g. register scavenger
- // can ignore them.
- for (MachineRegisterInfo::reg_iterator RI = mri_->reg_begin(cur->reg),
- RE = mri_->reg_end(); RI != RE; ++RI) {
- MachineOperand &MO = RI.getOperand();
- MO.setIsUndef();
- if (MO.isKill())
- MO.setIsKill(false);
- }
return;
}
unsigned Idx = (i < NumECs)
? EarlyClobberMOs[i].second : DefMOs[i-NumECs].second;
unsigned Reg = MO.getReg();
+ if (MO.isUndef())
+ continue;
// If it's dead upon def, then it is now free.
if (MO.isDead()) {
}
// Skip two-address destination operand.
- if (MI->isRegTiedToUseOperand(Idx)) {
+ unsigned UseIdx;
+ if (MI->isRegTiedToUseOperand(Idx, &UseIdx) &&
+ !MI->getOperand(UseIdx).isUndef()) {
assert(isUsed(Reg) && "Using an undefined register!");
continue;
}
? *DefMOs[i].first : *EarlyClobberMOs[i-NumDefs].first;
unsigned Idx = (i < NumECs)
? DefMOs[i].second : EarlyClobberMOs[i-NumDefs].second;
+ if (MO.isUndef())
+ continue;
// Skip two-address destination operand.
if (MI->isRegTiedToUseOperand(Idx))
if (!TargetRegisterInfo::isVirtualRegister(VirtReg)) {
// Check to see if this is a noop copy. If so, eliminate the
// instruction before considering the dest reg to be changed.
+ // Also check if it's copying from an "undef", if so, we can't
+ // eliminate this or else the undef marker is lost and it will
+ // confuses the scavenger. This is extremely rare.
unsigned Src, Dst, SrcSR, DstSR;
- if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst) {
+ if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst &&
+ !MI.findRegisterUseOperand(Src)->isUndef()) {
++NumDCE;
DOUT << "Removing now-noop copy: " << MI;
SmallVector<unsigned, 2> KillRegs;
Spills.disallowClobberPhysReg(VirtReg);
goto ProcessNextInst;
}
-
+
// If it's not a no-op copy, it clobbers the value in the destreg.
Spills.ClobberPhysReg(VirtReg);
ReusedOperands.markClobbered(VirtReg);
if (OpNum == 0) { // move -> store
unsigned SrcReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::STR))
- .addReg(SrcReg, getKillRegState(isKill))
+ .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
.addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
} else { // move -> load
unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::LDR))
- .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
+ .addReg(DstReg,
+ RegState::Define |
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef))
.addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
}
break;
unsigned PredReg = MI->getOperand(3).getReg();
if (OpNum == 0) { // move -> store
unsigned SrcReg = MI->getOperand(1).getReg();
+ bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTS))
- .addReg(SrcReg).addFrameIndex(FI)
+ .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
+ .addFrameIndex(FI)
.addImm(0).addImm(Pred).addReg(PredReg);
} else { // move -> load
unsigned DstReg = MI->getOperand(0).getReg();
- NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS), DstReg)
- .addFrameIndex(FI)
- .addImm(0).addImm(Pred).addReg(PredReg);
+ bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
+ NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS))
+ .addReg(DstReg,
+ RegState::Define |
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef))
+ .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
}
break;
}
if (OpNum == 0) { // move -> store
unsigned SrcReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTD))
- .addReg(SrcReg, getKillRegState(isKill))
+ .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
.addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
} else { // move -> load
unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDD))
- .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
+ .addReg(DstReg,
+ RegState::Define |
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef))
.addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
}
break;
if (Ops[0] == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
Opc = (Opc == Alpha::BISr) ? Alpha::STQ :
((Opc == Alpha::CPYSS) ? Alpha::STS : Alpha::STT);
NewMI = BuildMI(MF, MI->getDebugLoc(), get(Opc))
- .addReg(InReg, getKillRegState(isKill))
+ .addReg(InReg, getKillRegState(isKill) | getUndefRegState(isUndef))
.addFrameIndex(FrameIndex)
.addReg(Alpha::F31);
} else { // load -> move
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
Opc = (Opc == Alpha::BISr) ? Alpha::LDQ :
((Opc == Alpha::CPYSS) ? Alpha::LDS : Alpha::LDT);
NewMI = BuildMI(MF, MI->getDebugLoc(), get(Opc))
- .addReg(OutReg, RegState::Define | getDeadRegState(isDead))
+ .addReg(OutReg, RegState::Define | getDeadRegState(isDead) |
+ getUndefRegState(isUndef))
.addFrameIndex(FrameIndex)
.addReg(Alpha::F31);
}
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
if (FrameIndex < SPUFrameInfo::maxFrameOffset()) {
MachineInstrBuilder MIB = BuildMI(MF, MI->getDebugLoc(),
get(SPU::STQDr32));
- MIB.addReg(InReg, getKillRegState(isKill));
+ MIB.addReg(InReg, getKillRegState(isKill) | getUndefRegState(isUndef));
NewMI = addFrameReference(MIB, FrameIndex);
}
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
MachineInstrBuilder MIB = BuildMI(MF, MI->getDebugLoc(), get(Opc));
- MIB.addReg(OutReg, RegState::Define | getDeadRegState(isDead));
+ MIB.addReg(OutReg, RegState::Define | getDeadRegState(isDead) |
+ getUndefRegState(isUndef));
Opc = (FrameIndex < SPUFrameInfo::maxFrameOffset())
? SPU::STQDr32 : SPU::STQXr32;
NewMI = addFrameReference(MIB, FrameIndex);
if (Ops[0] == 0) { // COPY -> STORE
unsigned SrcReg = MI->getOperand(2).getReg();
bool isKill = MI->getOperand(2).isKill();
+ bool isUndef = MI->getOperand(2).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(Mips::SW))
- .addReg(SrcReg, getKillRegState(isKill))
+ .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
.addImm(0).addFrameIndex(FI);
} else { // COPY -> LOAD
unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(Mips::LW))
- .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
+ .addReg(DstReg, RegState::Define | getDeadRegState(isDead) |
+ getUndefRegState(isUndef))
.addImm(0).addFrameIndex(FI);
}
}
if (Ops[0] == 0) { // COPY -> STORE
unsigned SrcReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(2).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(StoreOpc))
- .addReg(SrcReg, getKillRegState(isKill))
+ .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
.addImm(0).addFrameIndex(FI) ;
} else { // COPY -> LOAD
unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(LoadOpc))
- .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
+ .addReg(DstReg, RegState::Define | getDeadRegState(isDead) |
+ getUndefRegState(isUndef))
.addImm(0).addFrameIndex(FI);
}
}
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::STW))
- .addReg(InReg, getKillRegState(isKill)),
+ .addReg(InReg,
+ getKillRegState(isKill) |
+ getUndefRegState(isUndef)),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::LWZ))
.addReg(OutReg,
RegState::Define |
- getDeadRegState(isDead)),
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef)),
FrameIndex);
}
} else if ((Opc == PPC::OR8 &&
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::STD))
- .addReg(InReg, getKillRegState(isKill)),
+ .addReg(InReg,
+ getKillRegState(isKill) |
+ getUndefRegState(isUndef)),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::LD))
.addReg(OutReg,
RegState::Define |
- getDeadRegState(isDead)),
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef)),
FrameIndex);
}
} else if (Opc == PPC::FMRD) {
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::STFD))
- .addReg(InReg, getKillRegState(isKill)),
+ .addReg(InReg,
+ getKillRegState(isKill) |
+ getUndefRegState(isUndef)),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::LFD))
.addReg(OutReg,
RegState::Define |
- getDeadRegState(isDead)),
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef)),
FrameIndex);
}
} else if (Opc == PPC::FMRS) {
if (OpNum == 0) { // move -> store
unsigned InReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::STFS))
- .addReg(InReg, getKillRegState(isKill)),
+ .addReg(InReg,
+ getKillRegState(isKill) |
+ getUndefRegState(isUndef)),
FrameIndex);
} else { // move -> load
unsigned OutReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = addFrameReference(BuildMI(MF, MI->getDebugLoc(), get(PPC::LFS))
.addReg(OutReg,
RegState::Define |
- getDeadRegState(isDead)),
+ getDeadRegState(isDead) |
+ getUndefRegState(isUndef)),
FrameIndex);
}
}
if (OpNum == 0) { // COPY -> STORE
unsigned SrcReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
+ bool isUndef = MI->getOperand(1).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(),
get(isFloat ? SP::STFri : SP::STDFri))
.addFrameIndex(FI)
.addImm(0)
- .addReg(SrcReg, getKillRegState(isKill));
+ .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef));
} else { // COPY -> LOAD
unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
+ bool isUndef = MI->getOperand(0).isUndef();
NewMI = BuildMI(MF, MI->getDebugLoc(),
get(isFloat ? SP::LDFri : SP::LDDFri))
- .addReg(DstReg, RegState::Define | getDeadRegState(isDead))
+ .addReg(DstReg, RegState::Define |
+ getDeadRegState(isDead) | getUndefRegState(isUndef))
.addFrameIndex(FI)
.addImm(0);
}
--- /dev/null
+; RUN: llvm-as < %s | llc -march=arm -mtriple=armv6-apple-darwin9
+
+@JJ = external global i32* ; <i32**> [#uses=1]
+
+define arm_apcscc void @SIM(i8* %A, i8* %B, i32 %M, i32 %N, i32 %K, [256 x i32]* %V, i32 %Q, i32 %R, i32 %nseq) nounwind {
+entry:
+ br i1 undef, label %bb5, label %bb
+
+bb: ; preds = %bb, %entry
+ br label %bb
+
+bb5: ; preds = %entry
+ br i1 undef, label %bb6, label %bb8
+
+bb6: ; preds = %bb6, %bb5
+ br i1 undef, label %bb8, label %bb6
+
+bb8: ; preds = %bb6, %bb5
+ br label %bb15
+
+bb9: ; preds = %bb15
+ br i1 undef, label %bb10, label %bb11
+
+bb10: ; preds = %bb9
+ unreachable
+
+bb11: ; preds = %bb9
+ br i1 undef, label %bb15, label %bb12
+
+bb12: ; preds = %bb11
+ %0 = load i32** @JJ, align 4 ; <i32*> [#uses=1]
+ br label %bb228.i
+
+bb74.i: ; preds = %bb228.i
+ br i1 undef, label %bb138.i, label %bb145.i
+
+bb138.i: ; preds = %bb74.i
+ br label %bb145.i
+
+bb145.i: ; preds = %bb228.i, %bb138.i, %bb74.i
+ %cflag.0.i = phi i16 [ 0, %bb228.i ], [ 0, %bb74.i ], [ 1, %bb138.i ] ; <i16> [#uses=1]
+ br i1 undef, label %bb146.i, label %bb151.i
+
+bb146.i: ; preds = %bb145.i
+ br i1 undef, label %bb228.i, label %bb151.i
+
+bb151.i: ; preds = %bb146.i, %bb145.i
+ %.not297 = icmp ne i16 %cflag.0.i, 0 ; <i1> [#uses=1]
+ %or.cond298 = and i1 undef, %.not297 ; <i1> [#uses=1]
+ br i1 %or.cond298, label %bb153.i, label %bb228.i
+
+bb153.i: ; preds = %bb151.i
+ br i1 undef, label %bb220.i, label %bb.nph.i98
+
+bb.nph.i98: ; preds = %bb153.i
+ br label %bb158.i
+
+bb158.i: ; preds = %bb218.i, %bb.nph.i98
+ %c.1020.i = phi i32 [ 0, %bb.nph.i98 ], [ %c.14.i, %bb218.i ] ; <i32> [#uses=1]
+ %cflag.418.i = phi i16 [ 0, %bb.nph.i98 ], [ %cflag.3.i, %bb218.i ] ; <i16> [#uses=1]
+ %pj.317.i = phi i32 [ undef, %bb.nph.i98 ], [ %8, %bb218.i ] ; <i32> [#uses=1]
+ %pi.316.i = phi i32 [ undef, %bb.nph.i98 ], [ %7, %bb218.i ] ; <i32> [#uses=1]
+ %fj.515.i = phi i32 [ undef, %bb.nph.i98 ], [ %fj.4.i, %bb218.i ] ; <i32> [#uses=3]
+ %ci.910.i = phi i32 [ undef, %bb.nph.i98 ], [ %ci.12.i, %bb218.i ] ; <i32> [#uses=2]
+ %i.121.i = sub i32 undef, undef ; <i32> [#uses=3]
+ %tmp105.i = sub i32 undef, undef ; <i32> [#uses=1]
+ %1 = sub i32 %c.1020.i, undef ; <i32> [#uses=0]
+ br i1 undef, label %bb168.i, label %bb160.i
+
+bb160.i: ; preds = %bb158.i
+ br i1 undef, label %bb161.i, label %bb168.i
+
+bb161.i: ; preds = %bb160.i
+ br i1 undef, label %bb168.i, label %bb163.i
+
+bb163.i: ; preds = %bb161.i
+ %2 = icmp slt i32 %fj.515.i, undef ; <i1> [#uses=1]
+ %3 = and i1 %2, undef ; <i1> [#uses=1]
+ br i1 %3, label %bb167.i, label %bb168.i
+
+bb167.i: ; preds = %bb163.i
+ br label %bb168.i
+
+bb168.i: ; preds = %bb167.i, %bb163.i, %bb161.i, %bb160.i, %bb158.i
+ %fi.5.i = phi i32 [ undef, %bb167.i ], [ %ci.910.i, %bb158.i ], [ undef, %bb160.i ], [ %ci.910.i, %bb161.i ], [ undef, %bb163.i ] ; <i32> [#uses=1]
+ %fj.4.i = phi i32 [ undef, %bb167.i ], [ undef, %bb158.i ], [ %fj.515.i, %bb160.i ], [ undef, %bb161.i ], [ %fj.515.i, %bb163.i ] ; <i32> [#uses=2]
+ %scevgep88.i = getelementptr i32* null, i32 %i.121.i ; <i32*> [#uses=3]
+ %4 = load i32* %scevgep88.i, align 4 ; <i32> [#uses=2]
+ %scevgep89.i = getelementptr i32* %0, i32 %i.121.i ; <i32*> [#uses=3]
+ %5 = load i32* %scevgep89.i, align 4 ; <i32> [#uses=1]
+ %ci.10.i = select i1 undef, i32 %pi.316.i, i32 %i.121.i ; <i32> [#uses=0]
+ %cj.9.i = select i1 undef, i32 %pj.317.i, i32 undef ; <i32> [#uses=0]
+ %6 = icmp slt i32 undef, 0 ; <i1> [#uses=3]
+ %ci.12.i = select i1 %6, i32 %fi.5.i, i32 %4 ; <i32> [#uses=2]
+ %cj.11.i100 = select i1 %6, i32 %fj.4.i, i32 %5 ; <i32> [#uses=1]
+ %c.14.i = select i1 %6, i32 0, i32 undef ; <i32> [#uses=2]
+ store i32 %c.14.i, i32* undef, align 4
+ %7 = load i32* %scevgep88.i, align 4 ; <i32> [#uses=1]
+ %8 = load i32* %scevgep89.i, align 4 ; <i32> [#uses=1]
+ store i32 %ci.12.i, i32* %scevgep88.i, align 4
+ store i32 %cj.11.i100, i32* %scevgep89.i, align 4
+ store i32 %4, i32* undef, align 4
+ br i1 undef, label %bb211.i, label %bb218.i
+
+bb211.i: ; preds = %bb168.i
+ br label %bb218.i
+
+bb218.i: ; preds = %bb211.i, %bb168.i
+ %cflag.3.i = phi i16 [ %cflag.418.i, %bb168.i ], [ 1, %bb211.i ] ; <i16> [#uses=2]
+ %9 = icmp slt i32 %tmp105.i, undef ; <i1> [#uses=1]
+ br i1 %9, label %bb220.i, label %bb158.i
+
+bb220.i: ; preds = %bb218.i, %bb153.i
+ %cflag.4.lcssa.i = phi i16 [ 0, %bb153.i ], [ %cflag.3.i, %bb218.i ] ; <i16> [#uses=0]
+ br i1 undef, label %bb221.i, label %bb228.i
+
+bb221.i: ; preds = %bb220.i
+ br label %bb228.i
+
+bb228.i: ; preds = %bb221.i, %bb220.i, %bb151.i, %bb146.i, %bb12
+ br i1 undef, label %bb74.i, label %bb145.i
+
+bb15: ; preds = %bb11, %bb8
+ br i1 undef, label %return, label %bb9
+
+return: ; preds = %bb15
+ ret void
+}
--- /dev/null
+; RUN: llvm-as < %s | llc -march=arm -mtriple=armv6-apple-darwin9
+
+@r = external global i32 ; <i32*> [#uses=1]
+@qr = external global i32 ; <i32*> [#uses=1]
+@II = external global i32* ; <i32**> [#uses=1]
+@no_mis = external global i32 ; <i32*> [#uses=1]
+@name1 = external global i8* ; <i8**> [#uses=1]
+
+declare arm_apcscc void @diff(i8*, i8*, i32, i32, i32, i32) nounwind
+
+define arm_apcscc void @SIM(i8* %A, i8* %B, i32 %M, i32 %N, i32 %K, [256 x i32]* %V, i32 %Q, i32 %R, i32 %nseq) nounwind {
+entry:
+ br i1 undef, label %bb5, label %bb
+
+bb: ; preds = %bb, %entry
+ br label %bb
+
+bb5: ; preds = %entry
+ br i1 undef, label %bb6, label %bb8
+
+bb6: ; preds = %bb6, %bb5
+ br i1 undef, label %bb8, label %bb6
+
+bb8: ; preds = %bb6, %bb5
+ %0 = load i8** @name1, align 4 ; <i8*> [#uses=0]
+ br label %bb15
+
+bb9: ; preds = %bb15
+ br i1 undef, label %bb10, label %bb11
+
+bb10: ; preds = %bb9
+ unreachable
+
+bb11: ; preds = %bb9
+ store i32 0, i32* @no_mis, align 4
+ %1 = getelementptr i8* %A, i32 0 ; <i8*> [#uses=1]
+ %2 = getelementptr i8* %B, i32 0 ; <i8*> [#uses=1]
+ tail call arm_apcscc void @diff(i8* %1, i8* %2, i32 undef, i32 undef, i32 undef, i32 undef) nounwind
+ br i1 undef, label %bb15, label %bb12
+
+bb12: ; preds = %bb11
+ %3 = load i32** @II, align 4 ; <i32*> [#uses=1]
+ %4 = load i32* @r, align 4 ; <i32> [#uses=1]
+ %5 = load i32* @qr, align 4 ; <i32> [#uses=1]
+ br label %bb228.i
+
+bb74.i: ; preds = %bb228.i
+ br i1 undef, label %bb138.i, label %bb145.i
+
+bb138.i: ; preds = %bb74.i
+ br label %bb145.i
+
+bb145.i: ; preds = %bb228.i, %bb138.i, %bb74.i
+ br i1 undef, label %bb146.i, label %bb151.i
+
+bb146.i: ; preds = %bb145.i
+ br i1 undef, label %bb228.i, label %bb151.i
+
+bb151.i: ; preds = %bb146.i, %bb145.i
+ br i1 undef, label %bb153.i, label %bb228.i
+
+bb153.i: ; preds = %bb151.i
+ %6 = add i32 undef, -1 ; <i32> [#uses=3]
+ br i1 undef, label %bb220.i, label %bb.nph.i98
+
+bb.nph.i98: ; preds = %bb153.i
+ br label %bb158.i
+
+bb158.i: ; preds = %bb218.i, %bb.nph.i98
+ %c.1020.i = phi i32 [ 0, %bb.nph.i98 ], [ %c.14.i, %bb218.i ] ; <i32> [#uses=1]
+ %f.419.i = phi i32 [ undef, %bb.nph.i98 ], [ %f.5.i, %bb218.i ] ; <i32> [#uses=1]
+ %pi.316.i = phi i32 [ undef, %bb.nph.i98 ], [ %10, %bb218.i ] ; <i32> [#uses=1]
+ %fj.515.i = phi i32 [ %6, %bb.nph.i98 ], [ %fj.4.i, %bb218.i ] ; <i32> [#uses=2]
+ %fi.614.i = phi i32 [ undef, %bb.nph.i98 ], [ %fi.5.i, %bb218.i ] ; <i32> [#uses=3]
+ %cj.811.i = phi i32 [ %6, %bb.nph.i98 ], [ %cj.11.i100, %bb218.i ] ; <i32> [#uses=3]
+ %ci.910.i = phi i32 [ undef, %bb.nph.i98 ], [ %ci.12.i, %bb218.i ] ; <i32> [#uses=2]
+ %7 = sub i32 %f.419.i, %4 ; <i32> [#uses=5]
+ %8 = sub i32 %c.1020.i, %5 ; <i32> [#uses=2]
+ %9 = icmp slt i32 %7, %8 ; <i1> [#uses=1]
+ br i1 %9, label %bb168.i, label %bb160.i
+
+bb160.i: ; preds = %bb158.i
+ br i1 undef, label %bb161.i, label %bb168.i
+
+bb161.i: ; preds = %bb160.i
+ br i1 undef, label %bb168.i, label %bb163.i
+
+bb163.i: ; preds = %bb161.i
+ br i1 undef, label %bb167.i, label %bb168.i
+
+bb167.i: ; preds = %bb163.i
+ br label %bb168.i
+
+bb168.i: ; preds = %bb167.i, %bb163.i, %bb161.i, %bb160.i, %bb158.i
+ %fi.5.i = phi i32 [ %fi.614.i, %bb167.i ], [ %ci.910.i, %bb158.i ], [ %fi.614.i, %bb160.i ], [ %ci.910.i, %bb161.i ], [ %fi.614.i, %bb163.i ] ; <i32> [#uses=2]
+ %fj.4.i = phi i32 [ %cj.811.i, %bb167.i ], [ %cj.811.i, %bb158.i ], [ %fj.515.i, %bb160.i ], [ %cj.811.i, %bb161.i ], [ %fj.515.i, %bb163.i ] ; <i32> [#uses=2]
+ %f.5.i = phi i32 [ %7, %bb167.i ], [ %8, %bb158.i ], [ %7, %bb160.i ], [ %7, %bb161.i ], [ %7, %bb163.i ] ; <i32> [#uses=2]
+ %scevgep88.i = getelementptr i32* %3, i32 undef ; <i32*> [#uses=1]
+ %ci.10.i = select i1 undef, i32 %pi.316.i, i32 undef ; <i32> [#uses=0]
+ %ci.12.i = select i1 undef, i32 %fi.5.i, i32 undef ; <i32> [#uses=1]
+ %cj.11.i100 = select i1 undef, i32 %fj.4.i, i32 undef ; <i32> [#uses=1]
+ %c.14.i = select i1 undef, i32 %f.5.i, i32 undef ; <i32> [#uses=1]
+ %10 = load i32* %scevgep88.i, align 4 ; <i32> [#uses=1]
+ br i1 undef, label %bb211.i, label %bb218.i
+
+bb211.i: ; preds = %bb168.i
+ br label %bb218.i
+
+bb218.i: ; preds = %bb211.i, %bb168.i
+ br i1 undef, label %bb220.i, label %bb158.i
+
+bb220.i: ; preds = %bb218.i, %bb153.i
+ %11 = getelementptr i32* null, i32 %6 ; <i32*> [#uses=1]
+ store i32 undef, i32* %11, align 4
+ br i1 undef, label %bb221.i, label %bb228.i
+
+bb221.i: ; preds = %bb220.i
+ br label %bb228.i
+
+bb228.i: ; preds = %bb221.i, %bb220.i, %bb151.i, %bb146.i, %bb12
+ br i1 undef, label %bb74.i, label %bb145.i
+
+bb15: ; preds = %bb11, %bb8
+ br i1 undef, label %return, label %bb9
+
+return: ; preds = %bb15
+ ret void
+}
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