[TF/XLA] Ignore _noinline inside force-compiled clusters

The code surrounding the handling of _noinline functions is very rarely hit,
and as a result is not well tested.  For now, the better approach is to follow
a more well-lit codepath and try to minimize the use of _noinline functions.

As a starting point, inline blocks even with _noinline inside force-compiled
blocks.

PiperOrigin-RevId: 313280139
Change-Id: I9f2d9b95d4bfe15eb2acea2a3d101b82355c14d5

tensorflow/compiler/tf2xla/BUILD

@@ -350,7 +350,6 @@ cc_library(
         ":sharding_util",
         ":side_effect_util",
         ":tf2xla_util",
-        "//tensorflow/compiler/jit:common",
         "//tensorflow/compiler/jit:flags",
         "//tensorflow/compiler/jit:shape_inference",
         "//tensorflow/compiler/jit:xla_cluster_util",

tensorflow/compiler/tf2xla/xla_compiler.cc

@@ -20,7 +20,6 @@ limitations under the License.
 
 #include "absl/memory/memory.h"
 #include "absl/types/variant.h"
-#include "tensorflow/compiler/jit/defs.h"
 #include "tensorflow/compiler/jit/flags.h"
 #include "tensorflow/compiler/jit/shape_inference.h"
 #include "tensorflow/compiler/tf2xla/graph_compiler.h"
@@ -572,10 +571,6 @@ std::unique_ptr<Graph> XlaCompiler::GetGraph(const FunctionBody* fbody) {
   std::unique_ptr<Graph> graph(new Graph(options_.flib_def));
   CopyGraph(*fbody->graph, graph.get());
 
-  bool is_inside_mustcompile;
-  TryGetNodeAttr(AttrSlice(&fbody->fdef.attr()), kXlaMustCompileAttr,
-                 &is_inside_mustcompile);
-
   // Performs a first function inlining pass before shape inference, since
   // otherwise shape inference can't see inside functions and a comprehensive
   // shape_map, including function ops, is needed to constant-propagate Shape
@@ -627,8 +622,6 @@ std::unique_ptr<Graph> XlaCompiler::GetGraph(const FunctionBody* fbody) {
   graph_optimizer_options.inline_multi_device_functions = true;
   graph_optimizer_options.inline_impl_selection_group_functions = true;
   graph_optimizer_options.inline_with_single_device_body_placer = true;
-  graph_optimizer_options.ignore_noinline = is_inside_mustcompile;
-
   optimizer.Optimize(flib_runtime_, flib_runtime_->env(),
                      /*device=*/nullptr, &graph, graph_optimizer_options);
 

tensorflow/core/common_runtime/graph_optimizer.cc

@@ -42,7 +42,7 @@ void GraphOptimizer::Optimize(
     const NodePredicate& cse_consider_fn, const NodePredicate& cf_consider_fn,
     bool inline_multi_device_functions,
     bool inline_impl_selection_group_functions,
-    bool inline_with_single_device_body_placer, bool ignore_noinline) {
+    bool inline_with_single_device_body_placer) {
   Graph* g = graph->get();
   DumpGraph("Initial", g);
 
@@ -116,11 +116,6 @@ void GraphOptimizer::Optimize(
             .inline_impl_selection_group_functions = true;
       }
 
-      if (ignore_noinline) {
-        expand_inline_opts.multi_device_options.ignore_noinline = true;
-        expand_inline_opts.native_options.ignore_noinline = true;
-      }
-
       bool was_mutated = ExpandInlineFunctions(runtime, g, expand_inline_opts);
       if (was_mutated) {
         DumpGraph("ExpandInlineFunctions", g);
@@ -143,11 +138,11 @@ void GraphOptimizer::Optimize(FunctionLibraryRuntime* runtime, Env* env,
                               const Device* device,
                               std::unique_ptr<Graph>* graph,
                               const Options& options) {
-  Optimize(
-      runtime, env, device, graph, options.shape_map, options.cse_consider_fn,
-      options.cf_consider_fn, options.inline_multi_device_functions,
-      options.inline_impl_selection_group_functions,
-      options.inline_with_single_device_body_placer, options.ignore_noinline);
+  Optimize(runtime, env, device, graph, options.shape_map,
+           options.cse_consider_fn, options.cf_consider_fn,
+           options.inline_multi_device_functions,
+           options.inline_impl_selection_group_functions,
+           options.inline_with_single_device_body_placer);
 }
 
 void OptimizeGraph(FunctionLibraryRuntime* lib, std::unique_ptr<Graph>* g,

tensorflow/core/common_runtime/graph_optimizer.h

@@ -58,9 +58,6 @@ class GraphOptimizer {
     // If true all functions will be inlined with a single device function
     // body placer strategy.
     bool inline_with_single_device_body_placer = false;
-
-    // If true, the _noinline attribute on functions and callers is ignored.
-    bool ignore_noinline = false;
   };
 
   explicit GraphOptimizer(const OptimizerOptions& opts);
@@ -84,8 +81,7 @@ class GraphOptimizer {
       const NodePredicate& cf_consider_fn = nullptr,
       bool inline_multi_device_functions = false,
       bool inline_impl_selection_group_functions = false,
-      bool inline_with_single_device_body_placer = false,
-      bool ignore_noinline = false);
+      bool inline_with_single_device_body_placer = false);
 
   const OptimizerOptions& options() { return opts_; }
 

tensorflow/python/eager/def_function_xla_jit_test.py

@@ -355,27 +355,6 @@ class DefFunctionTest(test.TestCase):
     self.assertAllClose([5.0, 5.0, 5.0], g())
     self.assertAllClose(compiled_g(), g())
 
-  def testTensorListConcatGradNestedCompile(self):
-
-    @def_function.function(experimental_compile=True)
-    def f(x):
-      ta = tensor_array_ops.TensorArray(
-          dtype=dtypes.float32, size=2, element_shape=[3])
-      ta = ta.write(0, 2 * x)
-      ta = ta.write(1, 3 * x)
-      return ta.concat()
-
-    @def_function.function(experimental_compile=True)
-    def g():
-      x = constant_op.constant([3.14, 2.68, 7.69])
-      with backprop.GradientTape() as tape:
-        tape.watch(x)
-        y = f(x)
-        out = tape.gradient(y, x)
-      return out
-
-    self.assertAllClose([5.0, 5.0, 5.0], g())
-
   def testCumsum(self):
 
     @def_function.function(experimental_compile=True)