Need reviewer: JDK 8 CR for Support Integer overflow

Roger Riggs Roger.Riggs at
Sat Feb 4 18:51:41 UTC 2012

The methods for increment, decrement, and also negation test for
exactly one value at the extremities of the value range.

The verbosity of method calls in the source code and the
overhead in the execution make these a poor choice for developers.
If the code must really operate correctly at the extremities then the
developer needs to carefully implement and check where appropriate.

The checking for overflow in addition, subtraction, and multiplication
are subtle or complex enough to warrant support in the runtime.


On 02/03/2012 01:00 PM, Stephen Colebourne wrote:
> On 3 February 2012 17:52, Eamonn McManus<eamonn at>  wrote:
>> I agree with Stephen Colebourne that brief implementation comments would be
>> useful. But I disagree with his proposed further methods in Math
>> (increment, decrement, int+long variants), which I don't think would pull
>> their weight.
> FWIW, JSR-310 currently has 18 non-test usages of increment/decrement,
> vs 42 uses of add. Less, but certainly used.
> The real value in increment/decrement is that it becomes a simple
> mapping from operator to method
> a++ = increment(a)
> a-- = decrement(a)
> a + b = add(a, b)
> This makes it easier to see what the intent would have been were the
> real operators safe.
> Stephen

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