Fix regression by explicitly checking if we are negating a SymIntConstantVal.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@53753 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/Analysis/RValues.cpp b/lib/Analysis/RValues.cpp
index 60c349420a..ed3dba925e 100644
--- a/lib/Analysis/RValues.cpp
+++ b/lib/Analysis/RValues.cpp
@@ -55,6 +55,20 @@ RVal::symbol_iterator RVal::symbol_end() const {
 }
 
 //===----------------------------------------------------------------------===//
+// Useful predicates.
+//===----------------------------------------------------------------------===//
+
+bool RVal::isZeroConstant() const {
+  if (isa<lval::ConcreteInt>(*this))
+    return cast<lval::ConcreteInt>(*this).getValue() == 0;
+  else if (isa<nonlval::ConcreteInt>(*this))
+    return cast<nonlval::ConcreteInt>(*this).getValue() == 0;
+  else
+    return false;
+}
+
+
+//===----------------------------------------------------------------------===//
 // Transfer function dispatch for Non-LVals.
 //===----------------------------------------------------------------------===//