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 >> [Tribuo](

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 os_

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 os_linux

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 os_linux

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 os_linux

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 t

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 os_linux

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 a