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Fix bug in register spilling when a preallocated live range overlaps a

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potential register assignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10291 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2003-12-05 11:17:55 +00:00
parent b27ef248f5
commit 49787e35c3
1 changed files with 3 additions and 13 deletions
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16
lib/CodeGen/RegAllocLinearScan.cpp
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@ -251,16 +251,6 @@ bool RA::runOnMachineFunction(MachineFunction &fn) {
// if this register is preallocated, look for an interval that
// overlaps with it and assign it to a memory location
if (i->reg < MRegisterInfo::FirstVirtualRegister) {
for (IntervalPtrs::iterator
ai = active_.begin(), ae = active_.end(); ai != ae; ++ai) {
unsigned virtReg = (*ai)->reg;
Virt2PhysMap::const_iterator it = v2pMap_.find(virtReg);
if (it != v2pMap_.end() && it->second == i->reg) {
active_.erase(ai);
clearVirtReg(virtReg);
break;
}
}
reservePhysReg(i->reg);
active_.push_back(&*i);
}
@ -607,7 +597,7 @@ void RA::assignStackSlotAtInterval(Intervals::const_iterator cur)
void RA::reservePhysReg(unsigned physReg)
{
DEBUG(std::cerr << "\t\t\treserving physical physical register: "
DEBUG(std::cerr << "\t\t\treserving physical register: "
<< mri_->getName(physReg) << '\n');
// if this register holds a value spill it
unsigned virtReg = p2vMap_[physReg];
@ -621,14 +611,14 @@ void RA::reservePhysReg(unsigned physReg)
break;
}
}
spillVirtReg(virtReg);
assignVirt2StackSlot(virtReg);
}
p2vMap_[physReg] = physReg; // this denotes a reserved physical register
}
void RA::clearReservedPhysReg(unsigned physReg)
{
DEBUG(std::cerr << "\t\t\tclearing reserved physical physical register: "
DEBUG(std::cerr << "\t\t\tclearing reserved physical register: "
<< mri_->getName(physReg) << '\n');
assert(p2vMap_[physReg] == physReg &&
"attempt to clear a non reserved physical register");