RFR: 8336240: Test com/sun/crypto/provider/Cipher/DES/PerformanceTest.java fails with java.lang.ArithmeticException [v2]

[Fernando Guallini]

> The manual test Cipher/DES/PerformanceTest.java fails with ArithmeticException due to potential division by zero. The issue arises when calculating the elapsed time using end - start, which could result in zero milliseconds if start and end are identical due to the high speed of execution. This leads to a division error in the following code snippet:
> 
> 
> start = System.currentTimeMillis();
> end = System.currentTimeMillis();
> int speed = (int)((data.length * count)/(end - start));
> 
> This issue is easily reproducible on platforms where System.currentTimeMillis() has low precision, such as many versions of Windows, end and start can be equal when obtaining System.currentTimeMillis() if the test runs very quickly.
> 
> The fix is to provide a default value in case _end_ is not higher than _start_.

Fernando Guallini has updated the pull request incrementally with one additional commit since the last revision:

  use microseconds as time unit

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20135/files
  - new: https://git.openjdk.org/jdk/pull/20135/files/ad4b94b3..03bae4c6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20135&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20135&range=00-01

  Stats: 10 lines in 1 file changed: 4 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/20135.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20135/head:pull/20135

PR: https://git.openjdk.org/jdk/pull/20135