The SlotIndex created by the default construction does not represent a position
in the function, and it doesn't make sense to compare it to other indexes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126924
91177308-0d34-0410-b5e6-
96231b3b80d8
}
IndexListEntry& entry() const {
+ assert(isValid() && "Attempt to compare reserved index.");
return *lie.getPointer();
}
/// Returns the instruction for the given index, or null if the given
/// index has no instruction associated with it.
MachineInstr* getInstructionFromIndex(SlotIndex index) const {
- return index.entry().getInstr();
+ return index.isValid() ? index.entry().getInstr() : 0;
}
/// Returns the next non-null index.
const LiveRange &range = cur.ranges.front();
VNInfo *vni = range.valno;
- if (vni->isUnused())
+ if (vni->isUnused() || !vni->def.isValid())
return Reg;
unsigned CandReg;
// one, e.g. X86::mov32to32_. These move instructions are not coalescable.
if (!vrm_->getRegAllocPref(cur->reg) && cur->hasAtLeastOneValue()) {
VNInfo *vni = cur->begin()->valno;
- if (!vni->isUnused()) {
+ if (!vni->isUnused() && vni->def.isValid()) {
MachineInstr *CopyMI = li_->getInstructionFromIndex(vni->def);
if (CopyMI && CopyMI->isCopy()) {
unsigned DstSubReg = CopyMI->getOperand(0).getSubReg();
if (UseMI->isIdentityCopy())
continue;
SlotIndex Idx = li_->getInstructionIndex(UseMI);
- // FIXME: Should this be Idx != UseIdx? SlotIndex() will return something
- // that compares higher than any other interval.
- if (Idx >= Start && Idx < End && Idx >= UseIdx) {
+ if (Idx >= Start && Idx < End && (!UseIdx.isValid() || Idx >= UseIdx)) {
LastUse = &Use;
UseIdx = Idx.getUseIndex();
}