Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog,dlog10,dexp iff 2.29 or greater on AArch64.

On Fri, 1 Apr 2022 15:38:36 GMT, Andrew Haley wrote: >> Will this patch change `java.lang.Math`, `java.lang.StrictMath` or both? >> I've noticed differences in iterative machine learning algorithms using exp >> & log across different JVMs and architectures which we try to track in >>

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog,dlog10,dexp iff 2.29 or greater on AArch64.

On Tue, 25 May 2021 15:32:40 GMT, gregcawthorne wrote: >> Glibc 2.29 onwards provides optimised versions of log,log10,exp. >> These functions have an accuracy of 0.9ulp or better in glibc >> 2.29. >> >> Therefore this patch adds code to parse, store and check >> the runtime glibcs version in

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On Thu, 15 Apr 2021 08:33:47 GMT, gregcawthorne wrote: > Glibc 2.29 onwards provides optimised versions of log,log10,exp. > These functions have an accuracy of 0.9ulp or better in glibc > 2.29. > > Therefore this patch adds code to parse, store and check > the runtime glibcs version in

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

Greg, what's your email address? Everything I try bounces. -- Andrew Haley (he/him) Java Platform Lead Engineer Red Hat UK Ltd. https://keybase.io/andrewhaley EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On Thu, 15 Apr 2021 08:33:47 GMT, gregcawthorne wrote: > Glibc 2.29 onwards provides optimised versions of log,log10,exp. > These functions have an accuracy of 0.9ulp or better in glibc > 2.29. > > Therefore this patch adds code to parse, store and check > the runtime glibcs version in

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On Thu, 15 Apr 2021 08:33:47 GMT, gregcawthorne wrote: > Glibc 2.29 onwards provides optimised versions of log,log10,exp. > These functions have an accuracy of 0.9ulp or better in glibc > 2.29. > > Therefore this patch adds code to parse, store and check > the runtime glibcs version in

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On Thu, 29 Apr 2021 20:24:25 GMT, Carlos O'Donell wrote: > Where does the requirement for monotonicity come from? Semi-monotonicity, to be precise. In the spec of java.lang.Math, "Besides accuracy at individual arguments, maintaining proper relations between the method at different arguments

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On 5/6/2021 5:21 AM, Carlos O'Donell wrote: On Thu, 15 Apr 2021 08:33:47 GMT, gregcawthorne wrote: Glibc 2.29 onwards provides optimised versions of log,log10,exp. These functions have an accuracy of 0.9ulp or better in glibc 2.29. Therefore this patch adds code to parse, store and check

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On Thu, 15 Apr 2021 08:33:47 GMT, gregcawthorne wrote: > Glibc 2.29 onwards provides optimised versions of log,log10,exp. > These functions have an accuracy of 0.9ulp or better in glibc > 2.29. > > Therefore this patch adds code to parse, store and check > the runtime glibcs version in

Re: RFR: 8265768 [aarch64] Use glibc libm impl for dlog, dlog10, dexp iff 2.29 or greater on AArch64.

On Wed, 28 Apr 2021 09:25:01 GMT, Andrew Haley wrote: > Re monotonicity: all is not necessarily lost. There's a theorem due to > Ferguson and Brightman which says that > > ``` > if > abs(f(m+) - f(m)) > eps < --- > abs(f(m+)) + abs(f(m))' > > for all m, the