Index: cfe/trunk/lib/Basic/Targets.cpp
===================================================================
--- cfe/trunk/lib/Basic/Targets.cpp
+++ cfe/trunk/lib/Basic/Targets.cpp
@@ -5176,6 +5176,7 @@
     // PCS specifies this for SysV variants, which is all we support. Other ABIs
     // may choose __ARM_FP16_FORMAT_ALTERNATIVE.
     Builder.defineMacro("__ARM_FP16_FORMAT_IEEE");
+    Builder.defineMacro("__ARM_FP16_ARGS");
 
     if (Opts.FastMath || Opts.FiniteMathOnly)
       Builder.defineMacro("__ARM_FP_FAST");
Index: cfe/trunk/test/Preprocessor/aarch64-target-features.c
===================================================================
--- cfe/trunk/test/Preprocessor/aarch64-target-features.c
+++ cfe/trunk/test/Preprocessor/aarch64-target-features.c
@@ -19,6 +19,7 @@
 // CHECK: __ARM_FEATURE_NUMERIC_MAXMIN 1
 // CHECK: __ARM_FEATURE_UNALIGNED 1
 // CHECK: __ARM_FP 0xe
+// CHECK: __ARM_FP16_ARGS 1
 // CHECK: __ARM_FP16_FORMAT_IEEE 1
 // CHECK-NOT: __ARM_FP_FAST 1
 // CHECK: __ARM_FP_FENV_ROUNDING 1