[MLIR][KernelGen] Add asin kernels and tests

PiperOrigin-RevId: 351381423
Change-Id: Idb6bb42a153c472da2b495bc66fd0b0202531e29

tensorflow/compiler/mlir/hlo/include/mlir-hlo/Dialect/mhlo/IR/chlo_ops.td

@@ -359,6 +359,19 @@ def HLOClient_AcosOp : HLOClient_UnaryElementwiseOp<"acos", [],
   }];
 }
 
+def HLOClient_AsinOp : HLOClient_UnaryElementwiseOp<"asin", [],
+    HLO_FpOrComplexTensor> {
+  let summary = "Asin operator";
+
+  let description = [{
+    Returns `Asin(operand)` element-wise.
+
+    $$
+    \asin(x) = 2 * atan(x / (1 + sqrt(1 - x^2)))
+    $$
+  }];
+}
+
 def HLOClient_AtanOp : HLOClient_UnaryElementwiseOp<"atan", [],
     HLO_FpOrComplexTensor> {
   let summary = "Atan operator";

tensorflow/compiler/mlir/hlo/lib/Dialect/mhlo/transforms/chlo_legalize_to_hlo_patterns.td

@@ -60,6 +60,25 @@ def : Pat<(HLOClient_AcosOp NonComplexElementType:$input),
     (HLO_ConstantLike<"M_PI"> $input)
   )>;
 
+// Expand asin to MHLO dialect as follows:
+//   asin(x) = 2 * atan(x / (1 + sqrt(1 - x^2)))
+def : Pat<(HLOClient_AsinOp $input),
+  (HLO_MulOp
+    (HLO_ConstantLike<"2"> $input),
+    (HLO_Atan2Op
+      $input,
+      (HLO_AddOp
+        (HLO_ConstantLike<"1"> $input),
+        (HLO_SqrtOp
+          (HLO_SubOp
+            (HLO_ConstantLike<"1"> $input),
+            (HLO_MulOp $input, $input)
+          )
+        )
+      )
+    )
+  )>;
+
 // Express `atan` as
 //   atan(x) = atan2(x, 1)
 def : Pat<(HLOClient_AtanOp $input),

tensorflow/compiler/mlir/hlo/lib/Dialect/mhlo/transforms/transform_unranked_hlo.cc

@@ -51,8 +51,8 @@ namespace {
 
 // TODO(herhut): Generate these out of op definitions.
 #define MAP_CHLO_OPERATION_CWISE_UNARY(fn, sep)                         \
-  fn(AcosOp) sep fn(AtanOp) sep fn(ConjOp) sep fn(ErfOp) sep fn(ErfcOp) \
-      sep fn(SinhOp) sep fn(TanOp)
+  fn(AcosOp) sep fn(AsinOp) sep fn(AtanOp) sep fn(ConjOp) sep fn(ErfOp) \
+      sep fn(ErfcOp) sep fn(SinhOp) sep fn(TanOp)
 
 template <typename OpTy>
 inline void AddLegalOpOnRankedTensor(ConversionTarget *target) {

tensorflow/compiler/mlir/xla/transforms/legalize_tf_patterns.td

@@ -586,6 +586,7 @@ def : Pat<(TF_ReverseV2Op AnyRankedTensor:$values, (ConstantLikeMatcher Elements
 foreach Mapping = [
                    [TF_AbsOp, HLO_AbsOp],
                    [TF_AcosOp, HLOClient_AcosOp],
+                   [TF_AsinOp, HLOClient_AsinOp],
                    [TF_AtanOp, HLOClient_AtanOp],
                    [TF_CeilOp, HLO_CeilOp],
                    [TF_ComplexAbsOp, HLO_AbsOp],

tensorflow/core/kernels/cwise_op_asin.cc

@@ -19,7 +19,10 @@ namespace tensorflow {
 REGISTER2(UnaryOp, CPU, "Asin", functor::asin, float, double);
 
 #if GOOGLE_CUDA || TENSORFLOW_USE_ROCM
+#if !defined(MLIR_GENERATED_GPU_KERNELS_ENABLED) || \
+    !defined(MLIR_GENERATED_EXPERIMENTAL_GPU_KERNELS_ENABLED)
 REGISTER2(UnaryOp, GPU, "Asin", functor::asin, float, double);
 #endif
+#endif
 
 }  // namespace tensorflow

tensorflow/core/kernels/mlir_generated/BUILD

@@ -47,6 +47,7 @@ filegroup(
 filegroup(
     name = "experimental_unary_kernel_srcs",
     srcs = [
+        "gpu_op_asin.cc",
         "gpu_op_atan.cc",
         "gpu_op_ceil.cc",
         "gpu_op_conj.cc",
@@ -107,6 +108,7 @@ tf_kernel_library(
         # sure that those targets can be built, so it should not hurt to
         # link them in even if they are currently not needed yet.
         ":abs_kernels",
+        ":asin_kernels",
         ":atan_kernels",
         ":ceil_kernels",
         ":conj_kernels",
@@ -303,6 +305,16 @@ gen_kernel_library(
     unroll_factors = "4",
 )
 
+gen_kernel_library(
+    name = "asin",
+    tile_size = "256",
+    types = [
+        "f32",
+        "f64",
+    ],
+    unroll_factors = "4",
+)
+
 gen_kernel_library(
     name = "atan",
     tile_size = "256",

tensorflow/core/kernels/mlir_generated/gpu_op_asin.cc

@@ -0,0 +1,24 @@
+/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor"
+#include "tensorflow/core/kernels/mlir_generated/gpu_ops_base.h"
+
+namespace tensorflow {
+
+GENERATE_AND_REGISTER_UNARY_KERNEL(Asin, f32, DT_FLOAT, float);
+GENERATE_AND_REGISTER_UNARY_KERNEL(Asin, f64, DT_DOUBLE, double);
+
+}  // namespace tensorflow

tensorflow/core/kernels/mlir_generated/gpu_ops_test_util.h

@@ -134,7 +134,14 @@ absl::InlinedVector<T, 10> DefaultInputNonZero() {
       {-18, -9, -1, 1, 3, 4, 5, 7, 9, 10, 18});
 }
 
-/// Helper functions to get default input data.
+template <typename T, std::enable_if_t<
+                          llvm::is_one_of<T, Eigen::half, float, double>::value,
+                          bool> = true>
+absl::InlinedVector<T, 10> DefaultInputBetweenZeroAndOne() {
+  return test::InputAsVector<T, double>({-0.999, -0.9, -0.8, -0.5, -0.1, -0.001,
+                                         -0, 0, 0.001, 0.1, 0.5, 0.8, 0.9,
+                                         0.999});
+}
 
 template <typename T,
           std::enable_if_t<llvm::is_one_of<T, int8, int16, int32, int64>::value,
@@ -146,6 +153,8 @@ absl::InlinedVector<T, 10> DefaultInputLessThanBitwidth() {
   return v;
 }
 
+/// Helper functions to get default input data.
+
 template <typename T,
           std::enable_if_t<llvm::is_one_of<T, int8, int16, int32, int64>::value,
                            bool> = true>

tensorflow/core/kernels/mlir_generated/gpu_unary_ops_test.cc

@@ -175,6 +175,17 @@ GENERATE_DEFAULT_TEST_WITH_SPECIFIC_INPUT_VALUES(
     Abs, DT_INT64, DT_INT64, test::NearZeroAndExtremeInput<int64>(), std::abs,
     test::GpuOpsTestConfig().ExpectStrictlyEqual())
 
+/// Test `tf.Asin`.
+
+// Test only values in the function domain. The othweise returned nan value
+// fails comparison for equality.
+GENERATE_DEFAULT_TEST_WITH_SPECIFIC_INPUT_VALUES(
+    Asin, DT_FLOAT, DT_FLOAT, test::DefaultInputBetweenZeroAndOne<float>(),
+    std::asin, test::GpuOpsTestConfig().ExpectStrictlyEqual())
+GENERATE_DEFAULT_TEST_WITH_SPECIFIC_INPUT_VALUES(
+    Asin, DT_DOUBLE, DT_DOUBLE, test::DefaultInputBetweenZeroAndOne<double>(),
+    std::asin, test::GpuOpsTestConfig().ExpectStrictlyEqual())
+
 /// Test `tf.Atan`.
 
 GENERATE_DEFAULT_TEST(Atan, DT_FLOAT, DT_FLOAT, std::atan,