check for warning when vectorizing without stride-one

lbmpy_tests/test_fluctuating_lb.py

@@ -9,7 +9,7 @@ from lbmpy.moments import is_bulk_moment, is_shear_moment, get_order
 from pystencils.rng import PhiloxTwoDoubles
 
 import pytest
-from pystencils.backends.simd_instruction_sets import get_supported_instruction_sets
+from pystencils.backends.simd_instruction_sets import get_supported_instruction_sets, get_vector_instruction_set
 
 
 def single_component_maxwell(x1, x2, kT, mass):
@@ -58,7 +58,7 @@ def add_pressure_output_to_collision_rule(collision_rule, pressure_field):
     collision_rule.main_assignments = collision_rule.main_assignments + pressure_ouput
 
 
-def get_fluctuating_lb(size=None, kT=None, omega_shear=None, omega_bulk=None, omega_odd=None, omega_even=None, rho_0=None, target=None, cpu_vectorize_info=None):
+def get_fluctuating_lb(size=None, kT=None, omega_shear=None, omega_bulk=None, omega_odd=None, omega_even=None, rho_0=None, target=None):
 
     # Parameters
     stencil = get_stencil('D3Q19')
@@ -85,8 +85,7 @@ def get_fluctuating_lb(size=None, kT=None, omega_shear=None, omega_bulk=None, om
     collision_rule = create_lb_collision_rule(
         method,
         fluctuating={
-            'temperature': kT,
-            'rng_node': PhiloxTwoDoubles,
+            'temperature': kT
         },
         optimization={'cse_global': True}
     )
@@ -103,7 +102,7 @@ def get_fluctuating_lb(size=None, kT=None, omega_shear=None, omega_bulk=None, om
                                                    {'density': rho, 'velocity': u})
 
     opts = {'cpu_openmp': True,
-            'cpu_vectorize_info': cpu_vectorize_info,
+            'cpu_vectorize_info': None,
             'target': dh.default_target}
 
     # Compile kernels
@@ -248,6 +247,7 @@ def test_point_force(target="cpu"):
         dh.cpu_arrays["force"][force_pos[0],
                                force_pos[1], force_pos[2]] = np.zeros(3)
 
+
 @pytest.mark.skipif(not get_supported_instruction_sets(), reason="No vector instruction sets supported")
 @pytest.mark.parametrize('assume_aligned', (True, False))
 @pytest.mark.parametrize('assume_inner_stride_one', (True, False))
@@ -274,14 +274,22 @@ def test_vectorization(assume_aligned, assume_inner_stride_one, assume_sufficien
                                       compressible=True,
                                       kernel_type='collide_only')
 
+    instruction_set = get_supported_instruction_sets()[-1]
     opts = {'cpu_openmp': False,
             'cpu_vectorize_info': {
-                'instruction_set': get_supported_instruction_sets()[0],
+                'instruction_set': instruction_set,
                 'assume_aligned': assume_aligned,
                 'assume_inner_stride_one': assume_inner_stride_one,
                 'assume_sufficient_line_padding': assume_sufficient_line_padding,
             },
             'target': 'cpu'}
 
-    code = ps.create_kernel(collision, **opts)
+    if not assume_inner_stride_one and 'storeS' not in get_vector_instruction_set('double', instruction_set):
+        with pytest.warns(UserWarning) as warn:
+            code = ps.create_kernel(collision, **opts)
+            assert 'Could not vectorize loop' in warn[0].message.args[0]
+    else:
+        with pytest.warns(None) as warn:
+            code = ps.create_kernel(collision, **opts)
+            assert len(warn) == 0
     code.compile()