If 'other' was empty 'overlapsFrom(other, other.begin());' will segfault. This avoids...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109075 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/LiveInterval.h b/include/llvm/CodeGen/LiveInterval.h
index 8d80efb..a0aea23 100644 (file)
--- a/include/llvm/CodeGen/LiveInterval.h
+++ b/include/llvm/CodeGen/LiveInterval.h
@@ -465,6 +465,8 @@ namespace llvm {
     /// overlaps - Return true if the intersection of the two live intervals is
     /// not empty.
     bool overlaps(const LiveInterval& other) const {
+      if (other.empty())
+        return false;
       return overlapsFrom(other, other.begin());
     }