Skip NaN encoding assertions for MIPS

Author: chenx97

Lib/test/test_struct.py

@@ -942,10 +942,15 @@ def test_half_float(self):
         else:
             expected = 0x7e
 
-        packed = struct.pack('<e', math.nan)
-        self.assertEqual(packed[1] & 0x7e, expected)
-        packed = struct.pack('<e', -math.nan)
-        self.assertEqual(packed[1] & 0x7e, expected)
+        # Skip NaN encoding checks for MIPS because `math.nan` changes its value
+        # depending on toolchain settings. See:
+        # https://en.wikipedia.org/wiki/NaN#Encoding
+        # https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/MIPS-Options.html#index-mnan_003d2008
+        if not platform.machines().startswith('mips'):
+            packed = struct.pack('<e', math.nan)
+            self.assertEqual(packed[1] & 0x7e, expected)
+            packed = struct.pack('<e', -math.nan)
+            self.assertEqual(packed[1] & 0x7e, expected)
 
         # Checks for round-to-even behavior
         format_bits_float__rounding_list = [