return I;
}
+MachineBasicBlock::iterator
+MachineBasicBlock::SkipPHIsAndLabels(MachineBasicBlock::iterator I) {
+ while (I != end() && (I->isPHI() || I->isLabel() || I->isDebugValue()))
+ ++I;
+ return I;
+}
+
MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator() {
iterator I = end();
- while (I != begin() && (--I)->getDesc().isTerminator())
+ while (I != begin() && ((--I)->getDesc().isTerminator() || I->isDebugValue()))
; /*noop */
- if (I != end() && !I->getDesc().isTerminator()) ++I;
+ while (I != end() && !I->getDesc().isTerminator())
+ ++I;
return I;
}
-void MachineBasicBlock::dump() const {
- print(dbgs());
+MachineBasicBlock::iterator MachineBasicBlock::getLastNonDebugInstr() {
+ iterator B = begin(), I = end();
+ while (I != B) {
+ --I;
+ if (I->isDebugValue())
+ continue;
+ return I;
+ }
+ // The block is all debug values.
+ return end();
+}
+
+const MachineBasicBlock *MachineBasicBlock::getLandingPadSuccessor() const {
+ // A block with a landing pad successor only has one other successor.
+ if (succ_size() > 2)
+ return 0;
+ for (const_succ_iterator I = succ_begin(), E = succ_end(); I != E; ++I)
+ if ((*I)->isLandingPad())
+ return *I;
+ return 0;
}
-static inline void OutputReg(raw_ostream &os, unsigned RegNo,
- const TargetRegisterInfo *TRI = 0) {
- if (RegNo != 0 && TargetRegisterInfo::isPhysicalRegister(RegNo)) {
- if (TRI)
- os << " %" << TRI->get(RegNo).Name;
- else
- os << " %physreg" << RegNo;
- } else
- os << " %reg" << RegNo;
+void MachineBasicBlock::dump() const {
+ print(dbgs());
}
StringRef MachineBasicBlock::getName() const {
if (Indexes) OS << '\t';
OS << " Live Ins:";
for (livein_iterator I = livein_begin(),E = livein_end(); I != E; ++I)
- OutputReg(OS, *I, TRI);
+ OS << ' ' << PrintReg(*I, TRI);
OS << '\n';
}
// Print the preds of this block according to the CFG.
MachineFunction *MF = getParent();
DebugLoc dl; // FIXME: this is nowhere
- // We may need to update this's terminator, but we can't do that if AnalyzeBranch
- // fails. If this uses a jump table, we won't touch it.
+ // We may need to update this's terminator, but we can't do that if
+ // AnalyzeBranch fails. If this uses a jump table, we won't touch it.
const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
MachineBasicBlock *TBB = 0, *FBB = 0;
SmallVector<MachineOperand, 4> Cond;
if (TII->AnalyzeBranch(*this, TBB, FBB, Cond))
return NULL;
+ // Avoid bugpoint weirdness: A block may end with a conditional branch but
+ // jumps to the same MBB is either case. We have duplicate CFG edges in that
+ // case that we can't handle. Since this never happens in properly optimized
+ // code, just skip those edges.
+ if (TBB && TBB == FBB) {
+ DEBUG(dbgs() << "Won't split critical edge after degenerate BB#"
+ << getNumber() << '\n');
+ return NULL;
+ }
+
MachineBasicBlock *NMBB = MF->CreateMachineBasicBlock();
MF->insert(llvm::next(MachineFunction::iterator(this)), NMBB);
DEBUG(dbgs() << "Splitting critical edge:"