}
MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator() {
- iterator I = end();
- while (I != begin() && (--I)->getDesc().isTerminator())
- ; /*noop */
- if (I != end() && !I->getDesc().isTerminator()) ++I;
- return I;
+ iterator B = begin(), I = end();
+ iterator Term = I;
+ while (I != B) {
+ --I;
+ // Ignore any debug values after the first terminator.
+ if (I->isDebugValue())
+ continue;
+ // Stop once we see a non-debug non-terminator.
+ if (!I->getDesc().isTerminator())
+ break;
+ // Earliest terminator so far.
+ Term = I;
+ }
+ // Return the first terminator, or end().
+ // Everything after Term is terminators and debug values.
+ return Term;
}
void MachineBasicBlock::dump() const {
#ifndef NDEBUG
for (MachineBasicBlock::iterator TI = llvm::next(Term);
TI != opBlock.end(); ++TI) {
+ if (TI->isDebugValue())
+ continue;
assert(!TI->readsRegister(SrcReg) &&
"Terminator instructions cannot use virtual registers unless"
"they are the first terminator in a block!");