Index: include/clang/Driver/CC1Options.td
===================================================================
--- include/clang/Driver/CC1Options.td
+++ include/clang/Driver/CC1Options.td
@@ -547,6 +547,8 @@
   HelpText<"Control vtordisp placement on win32 targets">;
 def fno_rtti_data : Flag<["-"], "fno-rtti-data">,
   HelpText<"Control emission of RTTI data">;
+def fnative_half_type: Flag<["-"], "fnative-half-type">,
+  HelpText<"Allow half types to appear natively in IR">;
 def fallow_half_arguments_and_returns : Flag<["-"], "fallow-half-arguments-and-returns">,
   HelpText<"Allow function arguments and returns of type half">;
 
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -1585,10 +1585,12 @@
   Opts.ImplementationOfModule =
       Args.getLastArgValue(OPT_fmodule_implementation_of);
   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
-  Opts.NativeHalfType = Opts.NativeHalfType;
+  if (!Opts.NativeHalfType && Args.hasArg(OPT_fnative_half_type))
+    Opts.NativeHalfType = Args.hasArg(OPT_fnative_half_type);
   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns);
   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
 
+
   if (!Opts.CurrentModule.empty() && !Opts.ImplementationOfModule.empty() &&
       Opts.CurrentModule != Opts.ImplementationOfModule) {
     Diags.Report(diag::err_conflicting_module_names)
Index: test/CodeGen/fp16-ops.c
===================================================================
--- test/CodeGen/fp16-ops.c
+++ test/CodeGen/fp16-ops.c
@@ -1,8 +1,16 @@
 // REQUIRES: arm-registered-target
-// RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOHALF --check-prefix=CHECK
-// RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOHALF --check-prefix=CHECK
-// RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi -fallow-half-arguments-and-returns %s | FileCheck %s --check-prefix=HALF --check-prefix=CHECK
-// RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi -fallow-half-arguments-and-returns %s | FileCheck %s --check-prefix=HALF --check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi %s \
+// RUN:   | FileCheck %s --check-prefix=NOHALF --check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi %s \
+// RUN:   | FileCheck %s --check-prefix=NOHALF --check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi -fallow-half-arguments-and-returns %s \
+// RUN:   | FileCheck %s --check-prefix=HALF --check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi -fallow-half-arguments-and-returns %s \
+// RUN:   | FileCheck %s --check-prefix=HALF --check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi -fnative-half-type %s \
+// RUN:   | FileCheck %s --check-prefix=NATIVE-HALF
+// RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi -fnative-half-type %s \
+// RUN:   | FileCheck %s --check-prefix=NATIVE-HALF
 typedef unsigned cond_t;
 
 volatile cond_t test;
@@ -18,37 +26,47 @@
   // NOHALF: [[F16TOF32:call float @llvm.convert.from.fp16.f32]]
   // HALF: [[F16TOF32:fpext half]]
   // CHECK: fptoui float
+  // NATIVE-HALF: fptoui half
   test = (h0);
   // CHECK: uitofp i32
   // NOHALF: [[F32TOF16:call i16 @llvm.convert.to.fp16.f32]]
   // HALF: [[F32TOF16:fptrunc float]]
+  // NATIVE-HALF: uitofp i32 {{.*}} to half
   h0 = (test);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp une float
+  // NATIVE-HALF: fcmp une half
   test = (!h1);
   // CHECK: [[F16TOF32]]
   // CHECK: fsub float
   // NOHALF: [[F32TOF16]]
   // HALF: [[F32TOF16]]
+  // NATIVE-HALF: fsub half
   h1 = -h1;
   // CHECK: [[F16TOF32]]
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: load volatile half
+  // NATIVE-HALF-NEXT: store volatile half
   h1 = +h1;
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   h1++;
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   ++h1;
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   --h1;
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   h1--;
 
   // Check binary ops with various operands
@@ -56,167 +74,227 @@
   // CHECK: [[F16TOF32]]
   // CHECK: fmul float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fmul half
   h1 = h0 * h2;
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F32TOF16]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fmul float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fmul half
   h1 = h0 * (__fp16) -2.0f;
   // CHECK: [[F16TOF32]]
   // CHECK: fmul float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fmul float
   h1 = h0 * f2;
   // CHECK: [[F16TOF32]]
   // CHECK: fmul float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fmul float
   h1 = f0 * h2;
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fdiv float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fdiv half
   h1 = (h0 / h2);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fdiv float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fdiv half
   h1 = (h0 / (__fp16) -2.0f);
   // CHECK: [[F16TOF32]]
   // CHECK: fdiv float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fdiv float
   h1 = (h0 / f2);
   // CHECK: [[F16TOF32]]
   // CHECK: fdiv float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fdiv float
   h1 = (f0 / h2);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   h1 = (h2 + h0);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   h1 = ((__fp16)-2.0 + h0);
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fadd float
   h1 = (h2 + f0);
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fadd float
   h1 = (f2 + h0);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fsub float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fsub half
   h1 = (h2 - h0);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fsub float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fsub half
   h1 = ((__fp16)-2.0f - h0);
   // CHECK: [[F16TOF32]]
   // CHECK: fsub float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fsub float
   h1 = (h2 - f0);
   // CHECK: [[F16TOF32]]
   // CHECK: fsub float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fsub float
   h1 = (f2 - h0);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp olt
+  // NATIVE-HALF: fcmp olt half
   test = (h2 < h0);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fcmp olt
+  // NATIVE-HALF: fcmp olt half
   test = (h2 < (__fp16)42.0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp olt
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp olt float
   test = (h2 < f0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp olt
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp olt float
   test = (f2 < h0);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp ogt
+  // NATIVE-HALF: fcmp ogt half
   test = (h0 > h2);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fcmp ogt
+  // NATIVE-HALF: fcmp ogt half
   test = ((__fp16)42.0 > h2);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp ogt
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp ogt float
   test = (h0 > f2);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp ogt
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp ogt float
   test = (f0 > h2);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp ole
+  // NATIVE-HALF: fcmp ole half
   test = (h2 <= h0);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fcmp ole
+  // NATIVE-HALF: fcmp ole half
   test = (h2 <= (__fp16)42.0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp ole
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp ole float
   test = (h2 <= f0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp ole
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp ole float
   test = (f2 <= h0);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp oge
+  // NATIVE-HALF: fcmp oge half
   test = (h0 >= h2);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fcmp oge
+  // NATIVE-HALF: fcmp oge half
   test = (h0 >= (__fp16)-2.0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp oge
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp oge float
   test = (h0 >= f2);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp oge
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp oge float
   test = (f0 >= h2);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp oeq
+  // NATIVE-HALF: fcmp oeq half
   test = (h1 == h2);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fcmp oeq
+  // NATIVE-HALF: fcmp oeq half
   test = (h1 == (__fp16)1.0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp oeq
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp oeq float
   test = (h1 == f1);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp oeq
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp oeq float
   test = (f1 == h1);
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp une
+  // NATIVE-HALF: fcmp une half
   test = (h1 != h2);
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fcmp une
+  // NATIVE-HALF: fcmp une half
   test = (h1 != (__fp16)1.0);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp une
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp une float
   test = (h1 != f1);
   // CHECK: [[F16TOF32]]
   // CHECK: fcmp une
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fcmp une float
   test = (f1 != h1);
 
   // CHECK: [[F16TOF32]]
@@ -224,91 +302,120 @@
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fcmp une half {{.*}}, 0xH0000
   h1 = (h1 ? h2 : h0);
   // Check assignments (inc. compound)
   h0 = h1;
   // NOHALF: [[F32TOF16]]
   // HALF: store {{.*}} half 0xHC000
+  // NATIVE-HALF: store {{.*}} half 0xHC000
   h0 = (__fp16)-2.0f;
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fptrunc float
   h0 = f0;
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fadd float
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   h0 += h1;
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fadd
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fadd half
   h0 += (__fp16)1.0f;
   // CHECK: [[F16TOF32]]
   // CHECK: fadd
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fadd float
+  // NATIVE-HALF: fptrunc float
   h0 += f2;
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fsub
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fsub half
   h0 -= h1;
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fsub
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fsub half
   h0 -= (__fp16)1.0;
   // CHECK: [[F16TOF32]]
   // CHECK: fsub
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fsub float
+  // NATIVE-HALF: fptrunc float
   h0 -= f2;
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fmul
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fmul half
   h0 *= h1;
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fmul
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fmul half
   h0 *= (__fp16)1.0;
   // CHECK: [[F16TOF32]]
   // CHECK: fmul
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fmul float
+  // NATIVE-HALF: fptrunc float
   h0 *= f2;
 
   // CHECK: [[F16TOF32]]
   // CHECK: [[F16TOF32]]
   // CHECK: fdiv
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fdiv half
   h0 /= h1;
   // CHECK: [[F16TOF32]]
   // NOHALF: [[F16TOF32]]
   // CHECK: fdiv
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fdiv half
   h0 /= (__fp16)1.0;
   // CHECK: [[F16TOF32]]
   // CHECK: fdiv
   // CHECK: [[F32TOF16]]
+  // NATIVE-HALF: fpext half
+  // NATIVE-HALF: fdiv float
+  // NATIVE-HALF: fptrunc float
   h0 /= f2;
 
   // Check conversions to/from double
   // NOHALF: call i16 @llvm.convert.to.fp16.f64(
   // HALF: fptrunc double {{.*}} to half
+  // NATIVE-HALF: fptrunc double {{.*}} to half
   h0 = d0;
 
   // CHECK: [[MID:%.*]] = fptrunc double {{%.*}} to float
   // NOHALF: call i16 @llvm.convert.to.fp16.f32(float [[MID]])
   // HALF: fptrunc float [[MID]] to half
+  // NATIVE-HALF: [[MID:%.*]] = fptrunc double {{%.*}} to float
+  // NATIVE-HALF: fptrunc float {{.*}} to half
   h0 = (float)d0;
 
   // NOHALF: call double @llvm.convert.from.fp16.f64(
   // HALF: fpext half {{.*}} to double
+  // NATIVE-HALF: fpext half {{.*}} to double
   d0 = h0;
 
   // NOHALF: [[MID:%.*]] = call float @llvm.convert.from.fp16.f32(
   // HALF: [[MID:%.*]] = fpext half {{.*}} to float
   // CHECK: fpext float [[MID]] to double
+  // NATIVE-HALF: [[MID:%.*]] = fpext half {{.*}} to float
+  // NATIVE-HALF: fpext float [[MID]] to double
   d0 = (float)h0;
 }