[OFFLOAD] Add plugin with support for Intel oneAPI Level Zero

offload/CMakeLists.txt

@@ -152,7 +152,7 @@ endif()
 
 set(LIBOMPTARGET_ALL_PLUGIN_TARGETS amdgpu cuda host)
 set(LIBOMPTARGET_PLUGINS_TO_BUILD "all" CACHE STRING
-    "Semicolon-separated list of plugins to use: cuda, amdgpu, host or \"all\".")
+    "Semicolon-separated list of plugins to use: cuda, amdgpu, level_zero, host or \"all\".")
 
 if(LIBOMPTARGET_PLUGINS_TO_BUILD STREQUAL "all")
   set(LIBOMPTARGET_PLUGINS_TO_BUILD ${LIBOMPTARGET_ALL_PLUGIN_TARGETS})
@@ -176,6 +176,18 @@ if(NOT (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(ppc64le)|(aarch64)$"
     list(REMOVE_ITEM LIBOMPTARGET_PLUGINS_TO_BUILD "cuda")
   endif()
 endif()
+if(NOT (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(AMD64)$" AND
+        CMAKE_SYSTEM_NAME MATCHES "Linux|Windows"))
+  if("level_zero" IN_LIST LIBOMPTARGET_PLUGINS_TO_BUILD)
+    message(STATUS "Not building Level Zero plugin: it is only supported on "
+                   "Linux/Windows x86_64 or ppc64le hosts")
+    list(REMOVE_ITEM LIBOMPTARGET_PLUGINS_TO_BUILD "level_zero")
+  endif()
+endif()
+if("level_zero" IN_LIST LIBOMPTARGET_PLUGINS_TO_BUILD AND
+   NOT LIBOMPTARGET_DEP_LEVEL_ZERO_FOUND)
+  list(REMOVE_ITEM LIBOMPTARGET_PLUGINS_TO_BUILD "level_zero")
+endif()
 message(STATUS "Building the offload library with support for "
                "the \"${LIBOMPTARGET_PLUGINS_TO_BUILD}\" plugins")
 
@@ -214,6 +226,7 @@ set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} riscv64-unknown-linux
 set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} riscv64-unknown-linux-gnu-LTO")
 set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} loongarch64-unknown-linux-gnu")
 set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} loongarch64-unknown-linux-gnu-LTO")
+set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} spirv64-intel")
 
 # Once the plugins for the different targets are validated, they will be added to
 # the list of supported targets in the current system.

offload/cmake/Modules/LibomptargetGetDependencies.cmake

@@ -42,6 +42,16 @@ endif()
 find_package(FFI QUIET)
 set(LIBOMPTARGET_DEP_LIBFFI_FOUND ${FFI_FOUND})
 
+################################################################################
+# Looking for offload-arch...
+################################################################################
+if(TARGET offload-arch)
+  get_property(LIBOMPTARGET_OFFLOAD_ARCH TARGET offload-arch PROPERTY LOCATION)
+else()
+  find_program(LIBOMPTARGET_OFFLOAD_ARCH NAMES offload-arch
+               PATHS ${LLVM_TOOLS_BINARY_DIR})
+endif()
+
 ################################################################################
 # Looking for NVIDIA GPUs...
 ################################################################################
@@ -89,4 +99,27 @@ if(LIBOMPTARGET_AMDGPU_ARCH)
   endif()
 endif()
 
+################################################################################
+# Looking for Level0
+################################################################################
+find_path(LIBOMPTARGET_DEP_LEVEL_ZERO_INCLUDE_DIR NAMES level_zero/ze_api.h)
+
+if(NOT LIBOMPTARGET_DEP_LEVEL_ZERO_INCLUDE_DIR)
+  set(LIBOMPTARGET_DEP_LEVEL_ZERO_FOUND FALSE)
+else()
+  set(LIBOMPTARGET_DEP_LEVEL_ZERO_FOUND TRUE)
+  find_library(LIBOMPTARGET_DEP_LEVEL_ZERO_LIBRARY NAMES ze_loader)
+endif()
+
+if(LIBOMPTARGET_OFFLOAD_ARCH)
+  execute_process(COMMAND ${LIBOMPTARGET_OFFLOAD_ARCH} "--only=intel"
+                  OUTPUT_VARIABLE LIBOMPTARGET_INTELGPU_ARCH_OUTPUT
+                  OUTPUT_STRIP_TRAILING_WHITESPACE)
+  string(REPLACE "\n" ";" intelgpu_arch_list "${LIBOMPTARGET_INTELGPU_ARCH_OUTPUT}")
+  if(intelgpu_arch_list)
+    set(LIBOMPTARGET_FOUND_INTELGPU_GPU TRUE)
+    set(LIBOMPTARGET_INTELGPU_DETECTED_ARCH_LIST "${intelgpu_arch_list}")
+  endif()
+endif()
+
 set(OPENMP_PTHREAD_LIB ${LLVM_PTHREAD_LIB})

offload/include/OpenMP/InteropAPI.h

@@ -160,17 +160,11 @@ struct InteropTableEntry {
     Interops.push_back(obj);
   }
 
-  template <class ClearFuncTy> void clear(ClearFuncTy f) {
-    for (auto &Obj : Interops) {
-      f(Obj);
-    }
-  }
-
   /// vector interface
   int size() const { return Interops.size(); }
   iterator begin() { return Interops.begin(); }
   iterator end() { return Interops.end(); }
-  iterator erase(iterator it) { return Interops.erase(it); }
+  void clear() { Interops.clear(); }
 };
 
 struct InteropTblTy