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| -rw-r--r-- | doc/release/upcoming_changes/21506.change.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/release/upcoming_changes/21506.change.rst b/doc/release/upcoming_changes/21506.change.rst new file mode 100644 index 000000000..18bc6cbc2 --- /dev/null +++ b/doc/release/upcoming_changes/21506.change.rst @@ -0,0 +1,18 @@ +Better reporting of integer division overflow +--------------------------------------------- + +Integer division overflow of scalars and arrays used to provide a ``RuntimeWarning`` +and the return value was undefined leading to crashes at rare occasions:: + + >>> np.array([np.iinfo(np.int32).min]*10, dtype=np.int32) // np.int32(-1) + <stdin>:1: RuntimeWarning: divide by zero encountered in floor_divide + array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0], dtype=int32) + +Integer division overflow now returns the input dtype's minimum value and raise the +following ``RuntimeWarning``:: + + >>> np.array([np.iinfo(np.int32).min]*10, dtype=np.int32) // np.int32(-1) + <stdin>:1: RuntimeWarning: overflow encountered in floor_divide + array([-2147483648, -2147483648, -2147483648, -2147483648, -2147483648, + -2147483648, -2147483648, -2147483648, -2147483648, -2147483648], + dtype=int32) |