diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -2996,7 +2996,7 @@
   // Floating-point types which fit into intptr_t are bitcast to integers
   // and then passed directly (after zero-extension, if necessary).
   if (V->getType()->isFloatingPointTy()) {
-    unsigned Bits = V->getType()->getPrimitiveSizeInBits();
+    unsigned Bits = V->getType()->getPrimitiveSizeInBits().getFixedSize();
     if (Bits <= TargetTy->getIntegerBitWidth())
       V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
                                                          Bits));