DeltaAlgorithm: Tweak split to split by first/second half instead of even/odd, since...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105613 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/DeltaAlgorithm.cpp b/lib/Support/DeltaAlgorithm.cpp
index d176548189191e5f93ea4ded9e82b76c89f3cebb..9e52874de832689a8b5c71d554edb1d2f3977a3f 100644 (file)
--- a/lib/Support/DeltaAlgorithm.cpp
+++ b/lib/Support/DeltaAlgorithm.cpp
@@ -30,10 +30,10 @@ void DeltaAlgorithm::Split(const changeset_ty &S, changesetlist_ty &Res) {
 
   // FIXME: This is really slow.
   changeset_ty LHS, RHS;
-  unsigned idx = 0;
+  unsigned idx = 0, N = S.size() / 2;
   for (changeset_ty::const_iterator it = S.begin(),
          ie = S.end(); it != ie; ++it, ++idx)
-    ((idx & 1) ? LHS : RHS).insert(*it);
+    ((idx < N) ? LHS : RHS).insert(*it);
   if (!LHS.empty())
     Res.push_back(LHS);
   if (!RHS.empty())