Add gtir_python backend

ci/default.yml

@@ -7,11 +7,11 @@ include:
     - tox -r -e run_stencil_tests -c model/ -- --backend=$BACKEND --grid=$GRID
   parallel:
     matrix:
-    - BACKEND: [gtfn_cpu, gtfn_gpu, roundtrip]
+    - BACKEND: [gtfn_cpu, gtfn_gpu, roundtrip, gtir_python]
       GRID: [simple_grid, icon_grid]
   rules:
     # exclude slow test configurations
-    - if: $BACKEND == "roundtrip" && $GRID == "icon_grid"
+    - if: $BACKEND in ["roundtrip", "gtir_python"] && $GRID == "icon_grid"
       when: never
     - when: on_success
 test_model_stencils_x86_64:

model/common/src/icon4py/model/common/config.py

@@ -18,6 +18,7 @@
     run_gtfn_cached,
     run_gtfn_gpu_cached,
 )
+from gt4py.next.program_processors.runners.roundtrip import gtir as gtir_python
 
 
 try:
@@ -44,6 +45,7 @@ class GT4PyBackend(Enum):
     CPU = "run_gtfn_cached"
     GPU = "run_gtfn_gpu_cached"
     ROUNDTRIP = "run_roundtrip"
+    GTIR_PYTHON = "gtir_python"
     DACE_CPU = "run_dace_cpu"
     DACE_GPU = "run_dace_gpu"
     DACE_CPU_NOOPT = "run_dace_cpu_noopt"
@@ -83,6 +85,7 @@ def gt4py_runner(self):
             GT4PyBackend.CPU.name: run_gtfn_cached,
             GT4PyBackend.GPU.name: run_gtfn_gpu_cached,
             GT4PyBackend.ROUNDTRIP.name: run_roundtrip,
+            GT4PyBackend.GTIR_PYTHON.name: gtir_python,
         }
         if dace:
             backend_map |= {

model/common/src/icon4py/model/common/test_utils/helpers.py

@@ -45,7 +45,7 @@ def is_embedded(backend) -> bool:
 
 
 def is_roundtrip(backend) -> bool:
-    return backend.name == "roundtrip" if backend else False
+    return backend.name in ["roundtrip", "gtir_python"] if backend else False
 
 
 def _shape(

model/common/src/icon4py/model/common/test_utils/pytest_config.py

@@ -10,6 +10,7 @@
 
 import pytest
 from gt4py.next import gtfn_cpu, gtfn_gpu, itir_python
+from gt4py.next.program_processors.runners.roundtrip import gtir as gtir_python
 
 import icon4py.model.common.settings as settings
 from icon4py.model.common.test_utils.datatest_utils import (
@@ -21,6 +22,7 @@
 backends = {
     "embedded": None,
     "roundtrip": itir_python,
+    "gtir_python": gtir_python,
     "gtfn_cpu": gtfn_cpu,
     "gtfn_gpu": gtfn_gpu,
 }