[AMDGPU] Change frexp.exp builtin to return i16 for f16 input

[arsenm]

LGTM

include/clang/Basic/BuiltinsAMDGPU.def

 
 TARGET_BUILTIN(__builtin_amdgcn_div_fixuph, "hhhh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_rcph, "hh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_rsqh, "hh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_sinh, "hh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_cosh, "hh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_ldexph, "hhi", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_frexp_manth, "hh", "nc", "16-bit-insts")
-TARGET_BUILTIN(__builtin_amdgcn_frexp_exph, "ih", "nc", "16-bit-insts")
+TARGET_BUILTIN(__builtin_amdgcn_frexp_exph, "sh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_fracth, "hh", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_classh, "bhi", "nc", "16-bit-insts")
 TARGET_BUILTIN(__builtin_amdgcn_s_memrealtime, "LUi", "n", "s-memrealtime")
 
 //===----------------------------------------------------------------------===//
 // Special builtins.
 //===----------------------------------------------------------------------===//
 BUILTIN(__builtin_amdgcn_read_exec, "LUi", "nc")

lib/CodeGen/CGBuiltin.cpp

Value *CodeGenFunction::EmitAMDGPUBuiltinExpr(unsigned BuiltinID,
   case AMDGPU::BI__builtin_amdgcn_ldexpf:
   case AMDGPU::BI__builtin_amdgcn_ldexph:
     return emitFPIntBuiltin(*this, E, Intrinsic::amdgcn_ldexp);
   case AMDGPU::BI__builtin_amdgcn_frexp_mant:
   case AMDGPU::BI__builtin_amdgcn_frexp_mantf:
   case AMDGPU::BI__builtin_amdgcn_frexp_manth:
     return emitUnaryBuiltin(*this, E, Intrinsic::amdgcn_frexp_mant);
   case AMDGPU::BI__builtin_amdgcn_frexp_exp:
-  case AMDGPU::BI__builtin_amdgcn_frexp_expf:
-  case AMDGPU::BI__builtin_amdgcn_frexp_exph:
-    return emitUnaryBuiltin(*this, E, Intrinsic::amdgcn_frexp_exp);
+  case AMDGPU::BI__builtin_amdgcn_frexp_expf: {
+    Value *Src0 = EmitScalarExpr(E->getArg(0));
+    Value *F = CGM.getIntrinsic(Intrinsic::amdgcn_frexp_exp,
+                                { Builder.getInt32Ty(), Src0->getType() });
+    return Builder.CreateCall(F, Src0);
+  }
+  case AMDGPU::BI__builtin_amdgcn_frexp_exph: {
+    Value *Src0 = EmitScalarExpr(E->getArg(0));
+    Value *F = CGM.getIntrinsic(Intrinsic::amdgcn_frexp_exp,
+                                { Builder.getInt16Ty(), Src0->getType() });
+    return Builder.CreateCall(F, Src0);
+  }
   case AMDGPU::BI__builtin_amdgcn_fract:
   case AMDGPU::BI__builtin_amdgcn_fractf:
   case AMDGPU::BI__builtin_amdgcn_fracth:
     return emitUnaryBuiltin(*this, E, Intrinsic::amdgcn_fract);
   case AMDGPU::BI__builtin_amdgcn_lerp:
     return emitTernaryBuiltin(*this, E, Intrinsic::amdgcn_lerp);
   case AMDGPU::BI__builtin_amdgcn_uicmp:
   case AMDGPU::BI__builtin_amdgcn_uicmpl:

test/CodeGenOpenCL/builtins-amdgcn-vi.cl

 // CHECK-LABEL: @test_frexp_mant_f16
 // CHECK: call half @llvm.amdgcn.frexp.mant.f16
 void test_frexp_mant_f16(global half* out, half a)
 {
   *out = __builtin_amdgcn_frexp_manth(a);
 }
 
 // CHECK-LABEL: @test_frexp_exp_f16
-// CHECK: call i32 @llvm.amdgcn.frexp.exp.f16
+// CHECK: call i16 @llvm.amdgcn.frexp.exp.i16.f16
 void test_frexp_exp_f16(global short* out, half a)
 {
   *out = __builtin_amdgcn_frexp_exph(a);
 }
 
 // CHECK-LABEL: @test_fract_f16
 // CHECK: call half @llvm.amdgcn.fract.f16
 void test_fract_f16(global half* out, half a)

test/CodeGenOpenCL/builtins-amdgcn.cl

 // CHECK-LABEL: @test_frexp_mant_f64
 // CHECK: call double @llvm.amdgcn.frexp.mant.f64
 void test_frexp_mant_f64(global double* out, double a)
 {
   *out = __builtin_amdgcn_frexp_mant(a);
 }
 
 // CHECK-LABEL: @test_frexp_exp_f32
-// CHECK: call i32 @llvm.amdgcn.frexp.exp.f32
+// CHECK: call i32 @llvm.amdgcn.frexp.exp.i32.f32
 void test_frexp_exp_f32(global int* out, float a)
 {
   *out = __builtin_amdgcn_frexp_expf(a);
 }
 
 // CHECK-LABEL: @test_frexp_exp_f64
-// CHECK: call i32 @llvm.amdgcn.frexp.exp.f64
+// CHECK: call i32 @llvm.amdgcn.frexp.exp.i32.f64
 void test_frexp_exp_f64(global int* out, double a)
 {
   *out = __builtin_amdgcn_frexp_exp(a);
 }
 
 // CHECK-LABEL: @test_fract_f32
 // CHECK: call float @llvm.amdgcn.fract.f32
 void test_fract_f32(global int* out, float a)