[ESIMD][NFC] Remove some obsolete ESIMD emulator related code (#12300)

The ESIMD emulator support was deleted in Sep 2023

Signed-off-by: Klochkov, Vyacheslav N <[email protected]>

Author: v-klochkov

sycl/include/sycl/ext/intel/esimd/emu/detail/esimd_emulator_device_interface.hpp

@@ -16,62 +16,23 @@
 /// \ingroup sycl_pi_esimd_emulator
 
 #include <sycl/detail/common.hpp>
-#include <sycl/ext/intel/esimd/emu/detail/esimd_emulator_device_interface.hpp>
 
 namespace sycl {
 inline namespace _V1 {
 namespace detail {
 
-__SYCL_EXPORT ESIMDDeviceInterface *getESIMDDeviceInterface() {
-  // TODO (performance) cache the interface pointer, can make a difference
-  // when calling fine-grained libCM APIs through it (like memory access in a
-  // tight loop)
-  void *PIOpaqueData = nullptr;
-
-  try {
-    PIOpaqueData =
-        getPluginOpaqueData<sycl::backend::ext_intel_esimd_emulator>(nullptr);
-  } catch (...) {
-    std::cerr << "ESIMD EMU plugin error or not loaded - try setting "
-                 "SYCL_DEVICE_FILTER=esimd_emulator:gpu environment variable"
-              << std::endl;
-    throw sycl::exception(sycl::errc::feature_not_supported);
-  }
-
-  ESIMDEmuPluginOpaqueData *OpaqueData =
-      reinterpret_cast<ESIMDEmuPluginOpaqueData *>(PIOpaqueData);
-
-  // First check if opaque data version is compatible.
-  if (OpaqueData->version != ESIMD_EMULATOR_PLUGIN_OPAQUE_DATA_VERSION) {
-    // NOTE: the version check should always be '!=' as layouts of different
-    // versions of PluginOpaqueData is not backward compatible, unlike
-    // layout of the ESIMDDeviceInterface.
+struct ESIMDDeviceInterface {
+  uintptr_t version;
+  void *reserved;
+  ESIMDDeviceInterface();
+};
 
-    std::cerr << __FUNCTION__ << std::endl
-              << "Opaque data returned by ESIMD Emu plugin is incompatible with"
-              << "the one used in current implementation." << std::endl
-              << "Returned version : " << OpaqueData->version << std::endl
-              << "Required version : "
-              << ESIMD_EMULATOR_PLUGIN_OPAQUE_DATA_VERSION << std::endl;
-    throw sycl::exception(sycl::errc::feature_not_supported);
-  }
-  // Opaque data version is OK, can cast the 'data' field.
-  ESIMDDeviceInterface *Interface =
-      reinterpret_cast<ESIMDDeviceInterface *>(OpaqueData->data);
-
-  // Now check that device interface version is compatible.
-  if (Interface->version < ESIMD_DEVICE_INTERFACE_VERSION) {
-    std::cerr << __FUNCTION__ << std::endl
-              << "The device interface version provided from plug-in "
-              << "library is behind required device interface version"
-              << std::endl
-              << "Found version : " << Interface->version << std::endl
-              << "Required version :" << ESIMD_DEVICE_INTERFACE_VERSION
-              << std::endl;
-    throw sycl::exception(sycl::errc::feature_not_supported);
-  }
-  return Interface;
+// TODO: this function is kept only for libsycl binary backward compatibility.
+// Remove it when ABI breaking changes are allowed.
+__SYCL_EXPORT ESIMDDeviceInterface *getESIMDDeviceInterface() {
+  return nullptr;
 }
+
 } // namespace detail
 } // namespace _V1
 } // namespace sycl