On Tue, 4 Oct 2022 17:36:56 GMT, Chris Hennick <d...@openjdk.org> wrote:
>> This PR improves both the worst-case performance of `nextExponential` and >> `nextGaussian` and the distribution of output at the tails. It fixes the >> following imperfections: >> >> * Repeatedly adding DoubleZigguratTables.exponentialX0 to extra causes a >> rounding error to accumulate at the tail of the distribution (probably >> starting around `2*exponentialX0 == 0x1.e46eff20739afp3 ~ 15.1`); this PR >> fixes that by tracking the multiple of exponentialX0 as a long. (This >> distortion is worst when `x > 0x1.0p56` since in that case, a rounding error >> means `extra + x == extra`. >> * Reduces several equations using `Math.fma`. (This will almost certainly >> improve performance, and may or may not improve output distribution.) >> * Uses the newly-extracted `computeWinsorizedNextExponential` function to >> prevent `nextGaussian` from going into the `nextExponential` tail twice. > > Chris Hennick has updated the pull request incrementally with one additional > commit since the last revision: > > Add parameter to enable/disable fixed PRNG seed Keep open. On Sat, Jan 14, 2023, 14:15 bridgekeeper[bot] ***@***.***> wrote: > @Pr0methean <https://github.com/Pr0methean> This pull request has been > inactive for more than 4 weeks and will be automatically closed if another > 4 weeks passes without any activity. To avoid this, simply add a new > comment to the pull request. Feel free to ask for assistance if you need > help with progressing this pull request towards integration! > > — > Reply to this email directly, view it on GitHub > <https://github.com/openjdk/jdk/pull/8131#issuecomment-1382939712>, or > unsubscribe > <https://github.com/notifications/unsubscribe-auth/ABF3NBO4MWUYIPGXBF7LBCDWSMQRHANCNFSM5SWZWANA> > . > You are receiving this because you were mentioned.Message ID: > ***@***.***> > ------------- PR: https://git.openjdk.org/jdk/pull/8131
