Index: clang/include/clang/Basic/Builtins.def
===================================================================
--- clang/include/clang/Basic/Builtins.def
+++ clang/include/clang/Basic/Builtins.def
@@ -141,6 +141,7 @@
 BUILTIN(__builtin_frexpf, "ffi*"  , "Fn")
 BUILTIN(__builtin_frexpl, "LdLdi*", "Fn")
 BUILTIN(__builtin_frexpf128, "LLdLLdi*", "Fn")
+BUILTIN(__builtin_frexpf16, "hhi*"  , "Fn")
 BUILTIN(__builtin_huge_val, "d", "ncE")
 BUILTIN(__builtin_huge_valf, "f", "ncE")
 BUILTIN(__builtin_huge_vall, "Ld", "ncE")
Index: clang/lib/CodeGen/CGBuiltin.cpp
===================================================================
--- clang/lib/CodeGen/CGBuiltin.cpp
+++ clang/lib/CodeGen/CGBuiltin.cpp
@@ -646,6 +646,24 @@
   }
 }
 
+static Value *emitFrexpBuiltin(CodeGenFunction &CGF, const CallExpr *E,
+                               llvm::Intrinsic::ID IntrinsicID) {
+  llvm::Value *Src0 = CGF.EmitScalarExpr(E->getArg(0));
+  llvm::Value *Src1 = CGF.EmitScalarExpr(E->getArg(1));
+
+  QualType IntPtrTy = E->getArg(1)->getType()->getPointeeType();
+  llvm::Type *IntTy = CGF.ConvertType(IntPtrTy);
+  llvm::Function *F =
+      CGF.CGM.getIntrinsic(IntrinsicID, {Src0->getType(), IntTy});
+  llvm::Value *Call = CGF.Builder.CreateCall(F, Src0);
+
+  llvm::Value *Exp = CGF.Builder.CreateExtractValue(Call, 1);
+  LValue LV = CGF.MakeNaturalAlignAddrLValue(Src1, IntPtrTy);
+  CGF.EmitStoreOfScalar(Exp, LV);
+
+  return CGF.Builder.CreateExtractValue(Call, 0);
+}
+
 /// EmitFAbs - Emit a call to @llvm.fabs().
 static Value *EmitFAbs(CodeGenFunction &CGF, Value *V) {
   Function *F = CGF.CGM.getIntrinsic(Intrinsic::fabs, V->getType());
@@ -2490,7 +2508,7 @@
       return RValue::get(emitUnaryMaybeConstrainedFPBuiltin(*this, E,
                                    Intrinsic::roundeven,
                                    Intrinsic::experimental_constrained_roundeven));
-                                   
+
     case Builtin::BIsin:
     case Builtin::BIsinf:
     case Builtin::BIsinl:
@@ -3060,6 +3078,12 @@
                                    { Src0->getType(), Src1->getType() });
     return RValue::get(Builder.CreateCall(F, { Src0, Src1 }));
   }
+  case Builtin::BI__builtin_frexp:
+  case Builtin::BI__builtin_frexpf:
+  case Builtin::BI__builtin_frexpl:
+  case Builtin::BI__builtin_frexpf128:
+  case Builtin::BI__builtin_frexpf16:
+    return RValue::get(emitFrexpBuiltin(*this, E, Intrinsic::frexp));
   case Builtin::BI__builtin_isgreater:
   case Builtin::BI__builtin_isgreaterequal:
   case Builtin::BI__builtin_isless:
Index: clang/test/CodeGen/aix-builtin-mapping.c
===================================================================
--- clang/test/CodeGen/aix-builtin-mapping.c
+++ clang/test/CodeGen/aix-builtin-mapping.c
@@ -18,5 +18,5 @@
 }
 
 // CHECK: %call = call double @modf(double noundef 1.000000e+00, ptr noundef %DummyLongDouble) #3
-// CHECK: %call1 = call double @frexp(double noundef 0.000000e+00, ptr noundef %DummyInt) #3
+// CHECK: %{{.+}} = call { double, i32 } @llvm.frexp.f64.i32(double 0.000000e+00)
 // CHECK: %{{.+}} = call double @llvm.ldexp.f64.i32(double 1.000000e+00, i32 1)
Index: clang/test/CodeGen/builtin-attributes.c
===================================================================
--- clang/test/CodeGen/builtin-attributes.c
+++ clang/test/CodeGen/builtin-attributes.c
@@ -4,6 +4,10 @@
 int printf(const char *, ...);
 void exit(int);
 
+float frexpf(float, int*);
+double frexp(double, int*);
+long double frexpl(long double, int*);
+
 // CHECK: declare i32 @printf(ptr noundef, ...)
 void f0() {
   printf("a\n");
@@ -49,9 +53,9 @@
 // CHECK: ret
 int f3(double x) {
   int e;
-  __builtin_frexp(x, &e);
-  __builtin_frexpf(x, &e);
-  __builtin_frexpl(x, &e);
+  frexp(x, &e);
+  frexpf(x, &e);
+  frexpl(x, &e);
   __builtin_modf(x, &e);
   __builtin_modff(x, &e);
   __builtin_modfl(x, &e);
Index: clang/test/CodeGen/math-builtins-long.c
===================================================================
--- clang/test/CodeGen/math-builtins-long.c
+++ clang/test/CodeGen/math-builtins-long.c
@@ -34,10 +34,10 @@
   // PPCF128: call fp128 @llvm.fabs.f128(fp128 %{{.+}})
   __builtin_fabsl(f);
 
-  // F80: call x86_fp80 @frexpl(x86_fp80 noundef %{{.+}}, ptr noundef %{{.+}})
-  // PPC: call ppc_fp128 @frexpl(ppc_fp128 noundef %{{.+}}, ptr noundef %{{.+}})
-  // X86F128: call fp128 @frexpl(fp128 noundef %{{.+}}, ptr noundef %{{.+}})
-  // PPCF128: call fp128 @frexpf128(fp128 noundef %{{.+}}, ptr noundef %{{.+}})
+  // F80: call { x86_fp80, i32 } @llvm.frexp.f80.i32(x86_fp80 %{{.+}})
+  // PPC: call { ppc_fp128, i32 } @llvm.frexp.ppcf128.i32(ppc_fp128 %{{.+}})
+  // X86F128: call { fp128, i32 } @llvm.frexp.f128.i32(fp128 %{{.+}})
+  // PPCF128: call { fp128, i32 } @llvm.frexp.f128.i32(fp128 %{{.+}})
   __builtin_frexpl(f,i);
 
   // F80: store x86_fp80 0xK7FFF8000000000000000, ptr
Index: clang/test/CodeGen/math-builtins.c
===================================================================
--- clang/test/CodeGen/math-builtins.c
+++ clang/test/CodeGen/math-builtins.c
@@ -12,6 +12,30 @@
 // NO__ERRNO: frem float
 // NO__ERRNO: frem x86_fp80
 // NO__ERRNO: frem fp128
+
+// NO__ERRNO: [[FREXP_F64:%.+]] = call { double, i32 } @llvm.frexp.f64.i32(double %{{.+}})
+// NO__ERRNO-NEXT: [[FREXP_F64_1:%.+]] = extractvalue { double, i32 } [[FREXP_F64]], 1
+// NO__ERRNO-NEXT: store i32 [[FREXP_F64_1]], ptr %{{.+}}, align 4
+// NO__ERRNO-NEXT: [[FREXP_F64_0:%.+]] = extractvalue { double, i32 } [[FREXP_F64]], 0
+
+// NO__ERRNO: [[FREXP_F32:%.+]] = call { float, i32 } @llvm.frexp.f32.i32(float %{{.+}})
+// NO__ERRNO-NEXT: [[FREXP_F32_1:%.+]] = extractvalue { float, i32 } [[FREXP_F32]], 1
+// NO__ERRNO-NEXT: store i32 [[FREXP_F32_1]], ptr %{{.+}}, align 4
+// NO__ERRNO-NEXT: [[FREXP_F32_0:%.+]] = extractvalue { float, i32 } [[FREXP_F32]], 0
+
+
+// NO__ERRNO: [[FREXP_F80:%.+]] = call { x86_fp80, i32 } @llvm.frexp.f80.i32(x86_fp80 %{{.+}})
+// NO__ERRNO-NEXT: [[FREXP_F80_1:%.+]] = extractvalue { x86_fp80, i32 } [[FREXP_F80]], 1
+// NO__ERRNO-NEXT: store i32 [[FREXP_F80_1]], ptr %{{.+}}, align 4
+// NO__ERRNO-NEXT: [[FREXP_F80_0:%.+]] = extractvalue { x86_fp80, i32 } [[FREXP_F80]], 0
+
+
+// NO__ERRNO: [[FREXP_F128:%.+]] = call { fp128, i32 } @llvm.frexp.f128.i32(fp128 %{{.+}})
+// NO__ERRNO-NEXT: [[FREXP_F128_1:%.+]] = extractvalue { fp128, i32 } [[FREXP_F128]], 1
+// NO__ERRNO-NEXT: store i32 [[FREXP_F128_1]], ptr %{{.+}}, align 4
+// NO__ERRNO-NEXT: [[FREXP_F128_0:%.+]] = extractvalue { fp128, i32 } [[FREXP_F128]], 0
+
+
 // HAS_ERRNO: declare double @fmod(double noundef, double noundef) [[NOT_READNONE:#[0-9]+]]
 // HAS_ERRNO: declare float @fmodf(float noundef, float noundef) [[NOT_READNONE]]
 // HAS_ERRNO: declare x86_fp80 @fmodl(x86_fp80 noundef, x86_fp80 noundef) [[NOT_READNONE]]
@@ -52,14 +76,14 @@
 
   __builtin_frexp(f,i);    __builtin_frexpf(f,i);   __builtin_frexpl(f,i); __builtin_frexpf128(f,i);
 
-// NO__ERRNO: declare double @frexp(double noundef, ptr noundef) [[NOT_READNONE:#[0-9]+]]
-// NO__ERRNO: declare float @frexpf(float noundef, ptr noundef) [[NOT_READNONE]]
-// NO__ERRNO: declare x86_fp80 @frexpl(x86_fp80 noundef, ptr noundef) [[NOT_READNONE]]
-// NO__ERRNO: declare fp128 @frexpf128(fp128 noundef, ptr noundef) [[NOT_READNONE]]
-// HAS_ERRNO: declare double @frexp(double noundef, ptr noundef) [[NOT_READNONE]]
-// HAS_ERRNO: declare float @frexpf(float noundef, ptr noundef) [[NOT_READNONE]]
-// HAS_ERRNO: declare x86_fp80 @frexpl(x86_fp80 noundef, ptr noundef) [[NOT_READNONE]]
-// HAS_ERRNO: declare fp128 @frexpf128(fp128 noundef, ptr noundef) [[NOT_READNONE]]
+// NO__ERRNO: declare { double, i32 } @llvm.frexp.f64.i32(double) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare { float, i32 } @llvm.frexp.f32.i32(float) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare { x86_fp80, i32 } @llvm.frexp.f80.i32(x86_fp80) [[READNONE_INTRINSIC]]
+// NO__ERRNO: declare { fp128, i32 } @llvm.frexp.f128.i32(fp128) [[READNONE_INTRINSIC]]
+// HAS_ERRNO: declare { double, i32 } @llvm.frexp.f64.i32(double) [[READNONE_INTRINSIC]]
+// HAS_ERRNO: declare { float, i32 } @llvm.frexp.f32.i32(float) [[READNONE_INTRINSIC]]
+// HAS_ERRNO: declare { x86_fp80, i32 } @llvm.frexp.f80.i32(x86_fp80) [[READNONE_INTRINSIC]]
+// HAS_ERRNO: declare { fp128, i32 } @llvm.frexp.f128.i32(fp128) [[READNONE_INTRINSIC]]
 
   __builtin_huge_val();    __builtin_huge_valf();   __builtin_huge_vall(); __builtin_huge_valf128();
 
@@ -88,7 +112,7 @@
 
   __builtin_modf(f,d);       __builtin_modff(f,fp);      __builtin_modfl(f,l); __builtin_modff128(f,l);
 
-// NO__ERRNO: declare double @modf(double noundef, ptr noundef) [[NOT_READNONE]]
+// NO__ERRNO: declare double @modf(double noundef, ptr noundef) [[NOT_READNONE:#[0-9]+]]
 // NO__ERRNO: declare float @modff(float noundef, ptr noundef) [[NOT_READNONE]]
 // NO__ERRNO: declare x86_fp80 @modfl(x86_fp80 noundef, ptr noundef) [[NOT_READNONE]]
 // NO__ERRNO: declare fp128 @modff128(fp128 noundef, ptr noundef) [[NOT_READNONE]]
Index: clang/test/CodeGenOpenCL/builtins-generic-amdgcn.cl
===================================================================
--- clang/test/CodeGenOpenCL/builtins-generic-amdgcn.cl
+++ clang/test/CodeGenOpenCL/builtins-generic-amdgcn.cl
@@ -39,3 +39,18 @@
 double test_builtin_ldexp(double v, int e) {
   return __builtin_ldexp(v, e);
 }
+
+// CHECK-LABEL: @test_builtin_frexpf16(
+half test_builtin_frexpf16(half v, int* e) {
+  return __builtin_frexpf16(v, e);
+}
+
+// CHECK-LABEL: @test_builtin_frexpf(
+float test_builtin_frexpf(float v, int* e) {
+  return __builtin_frexpf(v, e);
+}
+
+// CHECK-LABEL: @test_builtin_builtin_frexp(
+double test_builtin_frexp(double v, int* e) {
+  return __builtin_frexp(v, e);
+}