When replacing value numbers, make sure to compactify the value # space.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29865 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index a8c01da..4752b6d 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -470,6 +470,18 @@
}
}
}
+
+ // Now that V1 is dead, remove it. If it is the largest value number, just
+ // nuke it (and any other deleted values neighboring it), otherwise mark it as
+ // ~1U so it can be nuked later.
+ if (V1 == NumValues-1) {
+ do {
+ InstDefiningValue.pop_back();
+ --NumValues;
+ } while (InstDefiningValue.back() == ~1U);
+ } else {
+ InstDefiningValue[V1] = ~1U;
+ }
}