Port the parfor range kernel template to new API.

Author: Diptorup Deb

numba_dpex/core/descriptor.py

@@ -96,6 +96,10 @@ def typing_context(self):
         """
         return self._toplevel_typing_context
 
+    @property
+    def target_name(self):
+        return self._target_name
+
 
 class DpexTarget(TargetDescriptor):
     """

numba_dpex/core/parfors/kernel_builder.py

@@ -21,10 +21,12 @@
     rename_labels,
     replace_var_names,
 )
+from numba.core.target_extension import target_override
 from numba.core.typing import signature
 from numba.parfors import parfor
 
 from numba_dpex.core import config
+from numba_dpex.core.types.kernel_api.index_space_ids import ItemType
 from numba_dpex.kernel_api_impl.spirv import spirv_generator
 
 from ..descriptor import dpex_kernel_target
@@ -66,18 +68,18 @@ def _print_body(body_dict):
 def _compile_kernel_parfor(
     sycl_queue, kernel_name, func_ir, argtypes, debug=False
 ):
-
-    cres = compile_numba_ir_with_dpex(
-        pyfunc=func_ir,
-        pyfunc_name=kernel_name,
-        args=argtypes,
-        return_type=None,
-        debug=debug,
-        is_kernel=True,
-        typing_context=dpex_kernel_target.typing_context,
-        target_context=dpex_kernel_target.target_context,
-        extra_compile_flags=None,
-    )
+    with target_override(dpex_kernel_target.target_context.target_name):
+        cres = compile_numba_ir_with_dpex(
+            pyfunc=func_ir,
+            pyfunc_name=kernel_name,
+            args=argtypes,
+            return_type=None,
+            debug=debug,
+            is_kernel=True,
+            typing_context=dpex_kernel_target.typing_context,
+            target_context=dpex_kernel_target.target_context,
+            extra_compile_flags=None,
+        )
     cres.library.inline_threshold = config.INLINE_THRESHOLD
     cres.library._optimize_final_module()
     func = cres.library.get_function(cres.fndesc.llvm_func_name)
@@ -420,6 +422,13 @@ def create_kernel_for_parfor(
         print("kernel_ir after remove dead")
         kernel_ir.dump()
 
+    # The first argument to a range kernel is a kernel_api.Item object. The
+    # ``Item`` object is used by the kernel_api.spirv backend to generate the
+    # correct SPIR-V indexing instructions. Since, the argument is not something
+    # available originally in the kernel_param_types, we add it at this point to
+    # make sure the kernel signature matches the actual generated code.
+    ty_item = ItemType(parfor_dim)
+    kernel_param_types = (ty_item, *kernel_param_types)
     kernel_sig = signature(types.none, *kernel_param_types)
 
     if config.DEBUG_ARRAY_OPT:

numba_dpex/core/parfors/kernel_templates/range_kernel_template.py

@@ -63,15 +63,15 @@ def _generate_kernel_stub_as_string(self):
 
         # Create the dpex kernel function.
         kernel_txt += "def " + self._kernel_name
-        kernel_txt += "(" + (", ".join(self._kernel_params)) + "):\n"
+        kernel_txt += "(item, " + (", ".join(self._kernel_params)) + "):\n"
         global_id_dim = 0
         for_loop_dim = self._kernel_rank
         global_id_dim = self._kernel_rank
 
         for dim in range(global_id_dim):
             dimstr = str(dim)
             kernel_txt += (
-                f"    {self._ivar_names[dim]} = dpex.get_global_id({dimstr})\n"
+                f"    {self._ivar_names[dim]} = item.get_id({dimstr})\n"
             )
 
         for dim in range(global_id_dim, for_loop_dim):