Special handling of zero-sized live intervals.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49167 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/include/llvm/CodeGen/LiveInterval.h b/include/llvm/CodeGen/LiveInterval.h
index a50fef96b3..3fb0c1dc4e 100644
--- a/include/llvm/CodeGen/LiveInterval.h
+++ b/include/llvm/CodeGen/LiveInterval.h
@@ -275,14 +275,16 @@ namespace llvm {
 
     /// beginNumber - Return the lowest numbered slot covered by interval.
     unsigned beginNumber() const {
-      assert(!empty() && "empty interval for register");
+      if (empty())
+        return 0;
       return ranges.front().start;
     }
 
     /// endNumber - return the maximum point of the interval of the whole,
     /// exclusive.
     unsigned endNumber() const {
-      assert(!empty() && "empty interval for register");
+      if (empty())
+        return 0;
       return ranges.back().end;
     }