We don't need to scan the blocks that we are live-in on every
access. Rather we only have to do it on the creation of the interval.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11135 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index bef7653..f1bb499 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -162,23 +162,24 @@
// update interval index for this register
r2iMap_.insert(r2iit, std::make_pair(reg, --intervals_.end()));
interval = &intervals_.back();
+
+ // iterate over all of the blocks that the variable is
+ // completely live in, adding them to the live
+ // interval. obviously we only need to do this once.
+ for (unsigned i = 0, e = vi.AliveBlocks.size(); i != e; ++i) {
+ if (vi.AliveBlocks[i]) {
+ MachineBasicBlock* mbb = lv_->getIndexMachineBasicBlock(i);
+ if (!mbb->empty()) {
+ interval->addRange(getInstructionIndex(mbb->front()),
+ getInstructionIndex(mbb->back()) + 1);
+ }
+ }
+ }
}
else {
interval = &*r2iit->second;
}
- // iterate over all of the blocks that the variable is completely
- // live in, adding them to the live interval
- for (unsigned i = 0, e = vi.AliveBlocks.size(); i != e; ++i) {
- if (vi.AliveBlocks[i]) {
- MachineBasicBlock* mbb = lv_->getIndexMachineBasicBlock(i);
- if (!mbb->empty()) {
- interval->addRange(getInstructionIndex(mbb->front()),
- getInstructionIndex(mbb->back()) + 1);
- }
- }
- }
-
bool killedInDefiningBasicBlock = false;
for (int i = 0, e = vi.Kills.size(); i != e; ++i) {
MachineBasicBlock* killerBlock = vi.Kills[i].first;