+ @staticmethod
+ def cases(io_width, cases=None):
+ assert isinstance(io_width, int) and io_width >= 1
+ if cases is not None:
+ for n, d in cases:
+ assert isinstance(d, int) \
+ and 0 < d < (1 << io_width), "invalid case"
+ assert isinstance(n, int) \
+ and 0 <= n < (d << io_width), "invalid case"
+ yield (n, d)
+ elif io_width > 6:
+ assert io_width * 2 <= 256, \
+ "can't generate big enough numbers for test cases"
+ for i in range(10000):
+ d = hash_256(f'd {i}') % (1 << io_width)
+ if d == 0:
+ d = 1
+ n = hash_256(f'n {i}') % (d << io_width)
+ yield (n, d)
+ else:
+ for d in range(1, 1 << io_width):
+ for n in range(d << io_width):
+ yield (n, d)
+
+ def tst(self, io_width, cases=None):