1 files changed, 9 insertions, 0 deletions
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index c043a8a4e7..019a590f41 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -40,6 +40,15 @@ using namespace llvm;
 //                              Constant Class
 //===----------------------------------------------------------------------===//
 
+bool Constant::isNegativeZeroValue() const {
+  // Floating point values have an explicit -0.0 value.
+  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
+    return CFP->isZero() && CFP->isNegative();
+  
+  // Otherwise, just use +0.0.
+  return isNullValue();
+}
+
 // Constructor to create a '0' constant of arbitrary type...
 Constant *Constant::getNullValue(const Type *Ty) {
   switch (Ty->getTypeID()) {