On Thu, 24 Feb 2022 14:47:50 GMT, Jim Laskey <[email protected]> wrote:
> Class: ./java.base/share/classes/jdk/internal/util/random/RandomSupport.java
> Method: public static long[] convertSeedBytesToLongs(byte[] seed, int n, int
> z)
>
> The method attempts to create an array of longs by consuming the input bytes
> most significant bit first. New bytes are appended to the existing long using
> the OR operator on the signed byte. Due to sign extension this will overwrite
> all the existing bits from 63 to 8 if the next byte is negative.
test/jdk/java/util/Random/T8282144.java line 39:
> 37: public class T8282144 {
> 38: public static void main(String[] args) {
> 39: RandomGenerator rng =
> RandomGeneratorFactory.of("L64X128MixRandom").create(42);
Does `rng` always produce the same sequence? If so, then perhaps the seed,
`42`, should be a random value that is printed.
test/jdk/java/util/Random/T8282144.java line 52:
> 50: for (int k = 0; k < existing.length; k++) {
> 51: if (existing[k] != testing[k]) {
> 52: throw new
> RuntimeException("convertSeedBytesToLongs incorrect");
Should `i`, `j`, and `k` be included in the exception message?
-------------
PR: https://git.openjdk.java.net/jdk/pull/7614
