Hi Niels, On Tue, 2022-01-04 at 20:54 +0100, Niels Möller wrote: > ni...@lysator.liu.se (Niels Möller) writes: > > > ni...@lysator.liu.se (Niels Möller) writes: > > > > > I think it should be possible to reduce number of needed > > > registers, and > > > completely avoid using callee-save registers (load the values now > > > in > > > U4-U7 one at a time a bit closer to the place where they are > > > needed in), > > > and replace F3 with $1 in the FOLD and FOLDC macros. > > > > Attaching a variant to do this. Passes tests with qemu, but I > > haven't > > benchmarked it on any real hardware. > > Would you like to test and benchmark this on relevant real hardware, > before I merged this version? > > Code still below, and committed to the branch ppc-secp256-tweaks.
Compared to the current version in master branch, this version definitely improves the performance of the reduction code. On POWER9, the reduction code shows 7% speed up when tested separately. The improvement in P256 sign/verify is marginal. Here are the numbers from hogweed-benchmark on POWER9. name size sign/ms verify/ms ecdsa 256 11.1013 3.5713 (master) ecdsa 256 11.1527 3.6011 (this patch) Amitay. -- People on the net are always telling other people to "get a life." It would be so much simlper if there were on available under GPL. "If you use this life, you must tell other people where to get a life of their own." - Christopher Davis _______________________________________________ nettle-bugs mailing list nettle-bugs@lists.lysator.liu.se http://lists.lysator.liu.se/mailman/listinfo/nettle-bugs