RFR: 8075806: divideExact is missing in java.lang.Math
Raffaello Giulietti
raffaello.giulietti at gmail.com
Wed Jul 14 19:26:35 UTC 2021
One could also divide first and then check the result:
int q = x / y;
if ((x & y & q) >= 0) {
return r;
}
throw new ArithmeticException("integer overflow");
No idea about relative perf.
On 2021-07-13 19:32, Brian Burkhalter wrote:
> Please consider this proposal to add `divideExact()` methods for integral data types to `java.lang.Math` thereby rounding out "exact" support to all four basic arithmetic operations.
>
> -------------
>
> Commit messages:
> - 8075806: divideExact is missing in java.lang.Math
>
> Changes: https://git.openjdk.java.net/jdk/pull/4770/files
> Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4770&range=00
> Issue: https://bugs.openjdk.java.net/browse/JDK-8075806
> Stats: 109 lines in 2 files changed: 100 ins; 5 del; 4 mod
> Patch: https://git.openjdk.java.net/jdk/pull/4770.diff
> Fetch: git fetch https://git.openjdk.java.net/jdk pull/4770/head:pull/4770
>
> PR: https://git.openjdk.java.net/jdk/pull/4770
>
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