On Mon, Mar 30, 2026, at 2:39 AM, John Naylor wrote: > [new subject] > > On Sat, Mar 28, 2026 at 3:22 AM Greg Burd <[email protected]> wrote: > >> 0001 - This is a bug fix for DES/RISC-V/Clang DES initialization. >> >> ------> Join me in "the rabbit hole" on this issue if you care to... >> >> The existing software DES (as shown by the build-farm animal "greenfly" [1]) >> fails because Clang 20 has an auto-vectorization bug that we trigger in the >> DES initialization code (des_init() function), not the DES encryption >> algorithm itself. > >> [disable vectorization entirely] >> While that might also fix the other intermittent bug we'd been seeing on >> greenfly (not tested) disablnig all RVV optimizations seems to heavy handed >> to me. > > The first thing I notice is that not very long ago the buildfarm had 3 > gcc RISC-V members, but not anymore. If you care about having coverage > for this hardware, I'd suggest picking up gcc again if that's still > working, and wait and see about clang. Clang has shipped broken code > generation for obscure platforms in the past, and it seems here we're > not even sure of the extent of the breakage.
Hey John, All fair points. I've changed greenfly to use GCC 13.3.0, thanks for the suggestion. > -- > John Naylor > Amazon Web Services best. -greg
