LiveIntervalAnalysis: Fix performance bug that I introduced in r224663.
Without a reference the code did not remember when moving the iterators
of the subranges/registerunit ranges forward and instead would scan from
the beginning again at the next position.
llvm-svn: 224803
diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index 8c53658..56f38b6 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -676,7 +676,7 @@
// There should be no kill flag on FOO when %vreg5 is rewritten as %EAX.
for (auto &RUP : RU) {
const LiveRange &RURange = *RUP.first;
- LiveRange::const_iterator I = RUP.second;
+ LiveRange::const_iterator &I = RUP.second;
if (I == RURange.end())
continue;
I = RURange.advanceTo(I, RI->end);
@@ -704,7 +704,7 @@
DefinedLanesMask = 0;
for (auto &SRP : SRs) {
const LiveInterval::SubRange &SR = *SRP.first;
- LiveRange::const_iterator I = SRP.second;
+ LiveRange::const_iterator &I = SRP.second;
if (I == SR.end())
continue;
I = SR.advanceTo(I, RI->end);