Added a unit test for the error.

tests/next_tests/unit_tests/program_processor_tests/runners_tests/dace_tests/transformation_tests/test_loop_blocking.py

@@ -852,3 +852,71 @@ def test_loop_blocking_no_independent_nodes():
         validate_all=True,
     )
     assert count == 1
+
+
+import dace
+
+
+def _make_only_last_two_elements_sdfg() -> dace.SDFG:
+    sdfg = dace.SDFG(util.unique_name("simple_block_sdfg"))
+    state = sdfg.add_state("state", is_start_block=True)
+    sdfg.add_symbol("N", dace.int32)
+    sdfg.add_symbol("B", dace.int32)
+    sdfg.add_symbol("M", dace.int32)
+
+    for name in "acb":
+        sdfg.add_array(
+            name,
+            shape=(20, 10),
+            dtype=dace.float64,
+        )
+
+    state.add_mapped_tasklet(
+        "computation",
+        map_ranges={"i": "B:N", "k": "(M-2):M"},
+        inputs={
+            "__in1": dace.Memlet("a[i, k]"),
+            "__in2": dace.Memlet("b[i, k]"),
+        },
+        code="__out = __in1 + __in2",
+        outputs={"__out": dace.Memlet("c[i, k]")},
+        external_edges=True,
+    )
+    sdfg.validate()
+
+    return sdfg
+
+
+def test_only_last_two_elements_sdfg():
+    sdfg = _make_only_last_two_elements_sdfg()
+
+    def ref_comp(a, b, c, B, N, M):
+        for i in range(B, N):
+            for k in range(M - 2, M):
+                c[i, k] = a[i, k] + b[i, k]
+
+    count = sdfg.apply_transformations_repeated(
+        gtx_transformations.LoopBlocking(
+            blocking_size=1,
+            blocking_parameter="k",
+            require_independent_nodes=False,
+        ),
+        validate=True,
+        validate_all=True,
+    )
+    assert count == 1
+
+    ref = {
+        "a": np.array(np.random.rand(20, 10), dtype=np.float64),
+        "b": np.array(np.random.rand(20, 10), dtype=np.float64),
+        "c": np.zeros((20, 10), dtype=np.float64),
+        "B": 0,
+        "N": 20,
+        "M": 6,
+    }
+    res = copy.deepcopy(ref)
+
+    ref_comp(**ref)
+    sdfg(**res)
+
+    assert np.allclose(ref["c"], res["c"])