--- a/lib/Target/NVPTX/NVPTXSubtarget.cpp	Fri Nov 25 19:14:25 2016 +0900
+++ b/lib/Target/NVPTX/NVPTXSubtarget.cpp	Fri Oct 27 17:07:41 2017 +0900
@@ -23,6 +23,11 @@
 #define GET_SUBTARGETINFO_CTOR
 #include "NVPTXGenSubtargetInfo.inc"
 
+static cl::opt<bool>
+    NoF16Math("nvptx-no-f16-math", cl::ZeroOrMore, cl::Hidden,
+              cl::desc("NVPTX Specific: Disable generation of f16 math ops."),
+              cl::init(false));
+
 // Pin the vtable to this file.
 void NVPTXSubtarget::anchor() {}
 
@@ -57,3 +62,7 @@
   // Disabled, otherwise
   return false;
 }
+
+bool NVPTXSubtarget::allowFP16Math() const {
+  return hasFP16Math() && NoF16Math == false;
+}