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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Tests for integer division by zero."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.python.framework import constant_op
from tensorflow.python.framework import dtypes
from tensorflow.python.framework import errors_impl
from tensorflow.python.platform import test
class ZeroDivisionTest(test.TestCase):
def testZeros(self):
with self.test_session(use_gpu=True):
for dtype in dtypes.uint8, dtypes.int16, dtypes.int32, dtypes.int64:
zero = constant_op.constant(0, dtype=dtype)
one = constant_op.constant(1, dtype=dtype)
bads = [one // zero]
if dtype in (dtypes.int32, dtypes.int64):
bads.append(one % zero)
for bad in bads:
try:
result = bad.eval()
except errors_impl.OpError as e:
# Ideally, we'd get a nice exception. In theory, this should only
# happen on CPU, but 32 bit integer GPU division is actually on
# CPU due to a placer bug.
# TODO(irving): Make stricter once the placer bug is fixed.
self.assertIn('Integer division by zero', str(e))
else:
# On the GPU, integer division by zero produces all bits set.
# But apparently on some GPUs "all bits set" for 64 bit division
# means 32 bits set, so we allow 0xffffffff as well. This isn't
# very portable, so we may need to expand this list if other GPUs
# do different things.
self.assertTrue(test.is_gpu_available())
self.assertIn(result, (-1, 0xff, 0xffffffff))
if __name__ == '__main__':
test.main()
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