Exit with nice warnings when register allocator run out of registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63267 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 4392652..6341b9c 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -244,6 +244,16 @@ LiveInterval::addRangeFrom(LiveRange LR, iterator From) {
   return ranges.insert(it, LR);
 }
 
+/// isInOneLiveRange - Return true if the range specified is entirely in the
+/// a single LiveRange of the live interval.
+bool LiveInterval::isInOneLiveRange(unsigned Start, unsigned End) {
+  Ranges::iterator I = std::upper_bound(ranges.begin(), ranges.end(), Start);
+  if (I == ranges.begin())
+    return false;
+  --I;
+  return I->contains(Start) && I->contains(End-1);
+}
+
 
 /// removeRange - Remove the specified range from this interval.  Note that
 /// the range must be in a single LiveRange in its entirety.