Thiago Adams <thiago.adams@gmail.com> wrote:

Does anyone know of any platform where integer division by zero returns
a number, or in other words, where it's not treated as an error? I'm
asking because division by zero is undefined behaviour, but I think
division by a constant zero should be a constraint instead.

Yeah, I cannot think of an architecture where dividing by zero doesn't
result in an exception or error of some sort. But there's ARM, where it
might return 0, the dividend, or just garbage.

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goldside000@outlook.com writes:

Thiago Adams <thiago.adams@gmail.com> wrote:

Does anyone know of any platform where integer division by zero returns
a number, or in other words, where it's not treated as an error? I'm
asking because division by zero is undefined behaviour, but I think
division by a constant zero should be a constraint instead.

Yeah, I cannot think of an architecture where dividing by zero doesn't
result in an exception or error of some sort. But there's ARM, where it
might return 0, the dividend, or just garbage.

Yes, I mentioned that in this thread more than a month ago. On two
Linux AARM64 systems I've tried, dividing an integer by zero in a
non-constant expression yields 0.

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */

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Reply-To: slp53@pacbell.net

Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

goldside000@outlook.com writes:

Thiago Adams <thiago.adams@gmail.com> wrote:

Does anyone know of any platform where integer division by zero returns >>> a number, or in other words, where it's not treated as an error? I'm
asking because division by zero is undefined behaviour, but I think
division by a constant zero should be a constraint instead.

Yeah, I cannot think of an architecture where dividing by zero doesn't
result in an exception or error of some sort. But there's ARM, where it
might return 0, the dividend, or just garbage.

Yes, I mentioned that in this thread more than a month ago. On two
Linux AARM64 systems I've tried, dividing an integer by zero in a >non-constant expression yields 0.

From the ARMv8 Architecture Reference Manual (DDI0487)

If a signed integer division (INT_MIN / -1) is performed
where INT_MIN is the most negative integer value representable
in the selected register size, then the result overflows the
signed integer range. No indication of this overflow is produced
and the result that is written to the destination register is INT_MIN.

A division by zero results in a zero being written to the destination
register, without any indication that the division by zero occurred.


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