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Stack Coloring: Add support for multiple regions of the same slot, within a single basic block.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163507 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-09-10 12:39:35 +00:00
parent 8100d244ff
commit e47feeb823
2 changed files with 62 additions and 24 deletions
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lib/CodeGen/StackColoring.cpp
+34 -24
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@@ -351,40 +351,50 @@ void StackColoring::calculateLiveIntervals(unsigned NumSlots) {
Finishes.clear();
Finishes.resize(NumSlots);
// Create the interval for the basic blocks with lifetime markers in them.
for (SmallVector<MachineInstr*, 8>::iterator it = Markers.begin(),
e = Markers.end(); it != e; ++it) {
MachineInstr *MI = *it;
if (MI->getParent() != MBB)
continue;
assert((MI->getOpcode() == TargetOpcode::LIFETIME_START ||
MI->getOpcode() == TargetOpcode::LIFETIME_END) &&
"Invalid Lifetime marker");
bool IsStart = MI->getOpcode() == TargetOpcode::LIFETIME_START;
MachineOperand &Mo = MI->getOperand(0);
int Slot = Mo.getIndex();
assert(Slot >= 0 && "Invalid slot");
SlotIndex ThisIndex = Indexes->getInstructionIndex(MI);
if (IsStart) {
if (!Starts[Slot].isValid() || Starts[Slot] > ThisIndex)
Starts[Slot] = ThisIndex;
} else {
if (!Finishes[Slot].isValid() || Finishes[Slot] < ThisIndex)
Finishes[Slot] = ThisIndex;
}
}
// Create the interval of the blocks that we previously found to be 'alive'.
BitVector Alive = BlockLiveness[MBB].LiveIn;
Alive |= BlockLiveness[MBB].LiveOut;
if (Alive.any()) {
for (int pos = Alive.find_first(); pos != -1;
pos = Alive.find_next(pos)) {
Starts[pos] = Indexes->getMBBStartIdx(MBB);
Finishes[pos] = Indexes->getMBBEndIdx(MBB);
}
}
for (SmallVector<MachineInstr*, 8>::iterator it = Markers.begin(),
e = Markers.end(); it != e; ++it) {
MachineInstr *MI = *it;
assert((MI->getOpcode() == TargetOpcode::LIFETIME_START ||
MI->getOpcode() == TargetOpcode::LIFETIME_END) &&
"Invalid Lifetime marker");
if (MI->getParent() == MBB) {
bool IsStart = MI->getOpcode() == TargetOpcode::LIFETIME_START;
MachineOperand &Mo = MI->getOperand(0);
int Slot = Mo.getIndex();
assert(Slot >= 0 && "Invalid slot");
if (IsStart) {
Starts[Slot] = Indexes->getInstructionIndex(MI);
} else {
Finishes[Slot] = Indexes->getInstructionIndex(MI);
}
if (!Starts[pos].isValid())
Starts[pos] = Indexes->getMBBStartIdx(MBB);
if (!Finishes[pos].isValid())
Finishes[pos] = Indexes->getMBBEndIdx(MBB);
}
}
for (unsigned i = 0; i < NumSlots; ++i) {
assert(!!Starts[i] == !!Finishes[i] && "Unmatched range");
if (Starts[i] == Finishes[i])
assert(Starts[i].isValid() == Finishes[i].isValid() && "Unmatched range");
if (!Starts[i].isValid())
continue;
assert(Starts[i] && Finishes[i] && "Invalid interval");