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Special handling of zero-sized live intervals.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49167 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -275,14 +275,16 @@ namespace llvm {
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/// beginNumber - Return the lowest numbered slot covered by interval.
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unsigned beginNumber() const {
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assert(!empty() && "empty interval for register");
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if (empty())
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return 0;
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return ranges.front().start;
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}
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/// endNumber - return the maximum point of the interval of the whole,
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/// exclusive.
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unsigned endNumber() const {
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assert(!empty() && "empty interval for register");
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if (empty())
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return 0;
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return ranges.back().end;
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}
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@ -322,11 +322,13 @@ void RALinScan::linearScan()
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++NumIters;
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DOUT << "\n*** CURRENT ***: " << *cur << '\n';
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processActiveIntervals(cur->beginNumber());
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processInactiveIntervals(cur->beginNumber());
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if (!cur->empty()) {
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processActiveIntervals(cur->beginNumber());
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processInactiveIntervals(cur->beginNumber());
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assert(TargetRegisterInfo::isVirtualRegister(cur->reg) &&
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"Can only allocate virtual registers!");
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assert(TargetRegisterInfo::isVirtualRegister(cur->reg) &&
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"Can only allocate virtual registers!");
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}
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// Allocating a virtual register. try to find a free
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// physical register or spill an interval (possibly this one) in order to
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@ -508,11 +510,23 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
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{
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DOUT << "\tallocating current interval: ";
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// This is an implicitly defined live interval, just assign any register.
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const TargetRegisterClass *RC = reginfo_->getRegClass(cur->reg);
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if (cur->empty()) {
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unsigned physReg = cur->preference;
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if (!physReg)
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physReg = *RC->allocation_order_begin(*mf_);
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DOUT << tri_->getName(physReg) << '\n';
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// Note the register is not really in use.
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vrm_->assignVirt2Phys(cur->reg, physReg);
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handled_.push_back(cur);
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return;
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}
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PhysRegTracker backupPrt = *prt_;
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std::vector<std::pair<unsigned, float> > SpillWeightsToAdd;
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unsigned StartPosition = cur->beginNumber();
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const TargetRegisterClass *RC = reginfo_->getRegClass(cur->reg);
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const TargetRegisterClass *RCLeader = RelatedRegClasses.getLeaderValue(RC);
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// If this live interval is defined by a move instruction and its source is
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