TST: Skip test_rolling_var_numerical_issues on power platforms (#50349)

Author: mroeschke

pandas/compat/__init__.py

@@ -106,6 +106,18 @@ def is_platform_arm() -> bool:
     )
 
 
+def is_platform_power() -> bool:
+    """
+    Checking if the running platform use Power architecture.
+
+    Returns
+    -------
+    bool
+        True if the running platform uses ARM architecture.
+    """
+    return platform.machine() in ("ppc64", "ppc64le")
+
+
 def is_ci_environment() -> bool:
     """
     Checking if running in a continuous integration environment by checking

pandas/tests/window/test_rolling.py

@@ -9,6 +9,7 @@
 from pandas.compat import (
     is_platform_arm,
     is_platform_mac,
+    is_platform_power,
 )
 
 from pandas import (
@@ -1170,7 +1171,10 @@ def test_rolling_sem(frame_or_series):
     tm.assert_series_equal(result, expected)
 
 
-@pytest.mark.xfail(is_platform_arm() and not is_platform_mac(), reason="GH 38921")
+@pytest.mark.xfail(
+    (is_platform_arm() and not is_platform_mac()) or is_platform_power(),
+    reason="GH 38921",
+)
 @pytest.mark.parametrize(
     ("func", "third_value", "values"),
     [