Change std::list into a std::vector for IntervalSets. This reduces
compile time for 176.gcc from 5.6 secs to 4.7 secs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15072 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocIterativeScan.cpp b/lib/CodeGen/RegAllocIterativeScan.cpp
index b92fc74..63fd358 100644
--- a/lib/CodeGen/RegAllocIterativeScan.cpp
+++ b/lib/CodeGen/RegAllocIterativeScan.cpp
@@ -53,7 +53,7 @@
const TargetMachine* tm_;
const MRegisterInfo* mri_;
LiveIntervals* li_;
- typedef std::list<LiveInterval*> IntervalPtrs;
+ typedef std::vector<LiveInterval*> IntervalPtrs;
IntervalPtrs unhandled_, fixed_, active_, inactive_, handled_, spilled_;
std::auto_ptr<PhysRegTracker> prt_;
@@ -196,7 +196,8 @@
<< mf_->getFunction()->getName() << '\n');
- unhandled_.sort(less_ptr<LiveInterval>());
+ std::sort(unhandled_.begin(), unhandled_.end(),
+ greater_ptr<LiveInterval>());
DEBUG(printIntervals("unhandled", unhandled_.begin(), unhandled_.end()));
DEBUG(printIntervals("fixed", fixed_.begin(), fixed_.end()));
DEBUG(printIntervals("active", active_.begin(), active_.end()));
@@ -204,8 +205,8 @@
while (!unhandled_.empty()) {
// pick the interval with the earliest start point
- IntervalPtrs::value_type cur = unhandled_.front();
- unhandled_.pop_front();
+ IntervalPtrs::value_type cur = unhandled_.back();
+ unhandled_.pop_back();
++numIterations;
DEBUG(std::cerr << "\n*** CURRENT ***: " << *cur << '\n');