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Don't assign new registers created during a split to the same stack slot, but 

give them individual stack slots once the are actually spilled.

llvm-svn: 117945
This commit is contained in:
Jakob Stoklund Olesen 2010-11-01 19:49:57 +00:00
parent 31fffb62d9
commit ba9a4985a2
3 changed files with 3 additions and 16 deletions
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6
llvm/lib/CodeGen/InlineSpiller.cpp
View File

@ -369,12 +369,12 @@ void InlineSpiller::spill(LiveRangeEdit &edit) {
return;
rc_ = mri_.getRegClass(edit.getReg());
stackSlot_ = edit.assignStackSlot(vrm_);
stackSlot_ = vrm_.assignVirt2StackSlot(edit_->getReg());
// Update LiveStacks now that we are committed to spilling.
LiveInterval &stacklvr = lss_.getOrCreateInterval(stackSlot_, rc_);
if (!stacklvr.hasAtLeastOneValue())
stacklvr.getNextValue(SlotIndex(), 0, lss_.getVNInfoAllocator());
assert(stacklvr.empty() && "Just created stack slot not empty");
stacklvr.getNextValue(SlotIndex(), 0, lss_.getVNInfoAllocator());
stacklvr.MergeRangesInAsValue(edit_->getParent(), stacklvr.getValNumInfo(0));
// Iterate over instructions using register.

9
llvm/lib/CodeGen/LiveRangeEdit.cpp
View File

@ -19,21 +19,12 @@
using namespace llvm;
int LiveRangeEdit::assignStackSlot(VirtRegMap &vrm) {
int ss = vrm.getStackSlot(getReg());
if (ss != VirtRegMap::NO_STACK_SLOT)
return ss;
return vrm.assignVirt2StackSlot(getReg());
}
LiveInterval &LiveRangeEdit::create(MachineRegisterInfo &mri,
LiveIntervals &lis,
VirtRegMap &vrm) {
const TargetRegisterClass *RC = mri.getRegClass(parent_.reg);
unsigned VReg = mri.createVirtualRegister(RC);
vrm.grow();
// Immediately assign to the same stack slot as parent.
vrm.assignVirt2StackSlot(VReg, assignStackSlot(vrm));
LiveInterval &li = lis.getOrCreateInterval(VReg);
newRegs_.push_back(&li);
return li;

4
llvm/lib/CodeGen/LiveRangeEdit.h
View File

@ -80,10 +80,6 @@ public:
unsigned size() const { return newRegs_.size()-firstNew_; }
LiveInterval *get(unsigned idx) const { return newRegs_[idx+firstNew_]; }
/// assignStackSlot - Ensure a stack slot is assigned to parent.
/// @return the assigned stack slot number.
int assignStackSlot(VirtRegMap&);
/// create - Create a new register with the same class and stack slot as
/// parent.
LiveInterval &create(MachineRegisterInfo&, LiveIntervals&, VirtRegMap&);