Use factory function to create CubSortThunk

The `CubSortThunk` constructor was calling a function that returns a `absl::StatusOr`, and ignoring non-ok statuses and just accessing the value.

Presumably in prod the status is always ok, but making this failure case explicit.

PiperOrigin-RevId: 826410861

third_party/xla/xla/backends/gpu/runtime/BUILD

@@ -684,6 +684,7 @@ cc_library(
         "@com_google_absl//absl/container:inlined_vector",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
+        "@com_google_absl//absl/memory",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/status:statusor",
         "@com_google_absl//absl/strings:str_format",

third_party/xla/xla/backends/gpu/runtime/cub_sort_thunk.cc

@@ -26,6 +26,7 @@ limitations under the License.
 #include "absl/container/inlined_vector.h"
 #include "absl/log/check.h"
 #include "absl/log/log.h"
+#include "absl/memory/memory.h"
 #include "absl/status/status.h"
 #include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
@@ -283,16 +284,29 @@ CubSortRunnerInterface::Create(PrimitiveType type,
              : CreateCubSortRunner(type, platform_name);
 }
 
-CubSortThunk::CubSortThunk(
+absl::StatusOr<std::unique_ptr<CubSortThunk>> CubSortThunk::Create(
     ThunkInfo thunk_info, PrimitiveType type,
     std::optional<PrimitiveType> value_type,
     absl::InlinedVector<BufferAllocation::Slice, 2> operands,
     absl::InlinedVector<BufferAllocation::Slice, 2> results,
     BufferAllocation::Slice scratch, bool descending, int64_t batch_size,
-    absl::string_view platform_name)
+    absl::string_view platform_name) {
+  TF_ASSIGN_OR_RETURN(
+      std::unique_ptr<CubSortRunnerInterface> runner,
+      CubSortRunnerInterface::Create(type, value_type, platform_name));
+
+  return absl::WrapUnique<CubSortThunk>(
+      new CubSortThunk(thunk_info, std::move(runner), std::move(operands),
+                       std::move(results), scratch, descending, batch_size));
+}
+
+CubSortThunk::CubSortThunk(
+    ThunkInfo thunk_info, std::unique_ptr<CubSortRunnerInterface> runner,
+    absl::InlinedVector<BufferAllocation::Slice, 2> operands,
+    absl::InlinedVector<BufferAllocation::Slice, 2> results,
+    BufferAllocation::Slice scratch, bool descending, int64_t batch_size)
     : Thunk(Thunk::kCubSort, thunk_info),
-      runner_(CubSortRunnerInterface::Create(type, value_type, platform_name)
-                  .value()),
+      runner_(std::move(runner)),
       operands_(std::move(operands)),
       results_(std::move(results)),
       scratch_(scratch),

third_party/xla/xla/backends/gpu/runtime/cub_sort_thunk.h

@@ -54,12 +54,13 @@ class CubSortRunnerInterface {
 
 class CubSortThunk : public Thunk {
  public:
-  CubSortThunk(ThunkInfo thunk_info, PrimitiveType type,
+  static absl::StatusOr<std::unique_ptr<CubSortThunk>> Create(
+      ThunkInfo thunk_info, PrimitiveType type,
       std::optional<PrimitiveType> value_type,
       absl::InlinedVector<BufferAllocation::Slice, 2> operands,
       absl::InlinedVector<BufferAllocation::Slice, 2> results,
-               BufferAllocation::Slice scratch, bool descending,
-               int64_t batch_size, absl::string_view platform_name);
+      BufferAllocation::Slice scratch, bool descending, int64_t batch_size,
+      absl::string_view platform_name);
 
   absl::Status ExecuteOnStream(const ExecuteParams& params) override {
     return runner_->Run(params, this);
@@ -72,6 +73,12 @@ class CubSortThunk : public Thunk {
   int64_t batch_size() const { return batch_size_; }
 
  private:
+  CubSortThunk(ThunkInfo thunk_info,
+               std::unique_ptr<CubSortRunnerInterface> runner,
+               absl::InlinedVector<BufferAllocation::Slice, 2> operands,
+               absl::InlinedVector<BufferAllocation::Slice, 2> results,
+               BufferAllocation::Slice scratch, bool descending,
+               int64_t batch_size);
   std::unique_ptr<CubSortRunnerInterface> runner_;
   absl::InlinedVector<BufferAllocation::Slice, 2> operands_;
   absl::InlinedVector<BufferAllocation::Slice, 2> results_;

third_party/xla/xla/service/gpu/ir_emitter_unnested.cc

@@ -1072,7 +1072,9 @@ absl::Status IrEmitterUnnested::EmitCubDeviceRadixSort(
   TF_ASSIGN_OR_RETURN(xla::SortOptions options,
                       instr->backend_config<xla::SortOptions>());
   const Shape& operand_shape = instr->operand(0)->shape();
-  auto thunk = std::make_unique<CubSortThunk>(
+  TF_ASSIGN_OR_RETURN(
+      std::unique_ptr<CubSortThunk> thunk,
+      CubSortThunk::Create(
           Thunk::ThunkInfo::WithProfileAnnotation(
               instr, ir_emitter_context_->GetNextThunkId()),
           operand_shape.element_type(),
@@ -1082,7 +1084,7 @@ absl::Status IrEmitterUnnested::EmitCubDeviceRadixSort(
           operands, results, scratch, options.descending(),
           Product(operand_shape.dimensions()) /
               operand_shape.dimensions(operand_shape.dimensions().size() - 1),
-      ir_emitter_context_->platform_name());
+          ir_emitter_context_->platform_name()));
   AddThunkToThunkSequence(std::move(thunk));
   return absl::OkStatus();
 }