Add a register allocation preference field; add a method to compute size of a live interval.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36216 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 0ca16007b2..45c1dd03da 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -349,6 +349,8 @@ void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
   ValueNumberInfo.clear();
   ValueNumberInfo.append(NewValueNumberInfo.begin(), NewValueNumberInfo.end());
   weight += Other.weight;
+  if (Other.preference && !preference)
+    preference = Other.preference;
 }
 
 /// MergeRangesInAsValue - Merge all of the intervals in RHS into this live
@@ -467,6 +469,13 @@ void LiveInterval::MergeValueNumberInto(unsigned V1, unsigned V2) {
   }
 }
 
+unsigned LiveInterval::getSize() const {
+  unsigned Sum = 0;
+  for (const_iterator I = begin(), E = end(); I != E; ++I)
+    Sum += I->end - I->start;
+  return Sum;
+}
+
 std::ostream& llvm::operator<<(std::ostream& os, const LiveRange &LR) {
   return os << '[' << LR.start << ',' << LR.end << ':' << LR.ValId << ")";
 }