Jeffrey Walton <noloa...@gmail.com> writes: > I believe the 64-bit adds (addudm) and subtracts (subudm) require > POWER8.
I don't think there are any 64-bit adds in my chacha code, only 32-bit, vadduwm. The chacha state is fundamentally 16 32-bit words, with operations very friendly to 4-way simd. Using 64-bit adds might be useful for later code doing multiple blocks, for updating the counter (for the original 64-bit counter variant of chacha). Might make sense to do manual carry handling to keep it working on power7. So it would make sense to add the code to a new directory powerpc64/p7/ ? Regards, /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677. Internet email is subject to wholesale government surveillance. _______________________________________________ nettle-bugs mailing list nettle-bugs@lists.lysator.liu.se http://lists.lysator.liu.se/mailman/listinfo/nettle-bugs
