Date: Thu, 11 Jun 2026 09:54:09 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Piotr Kubaj <pkubaj@freebsd.org> Cc: freebsd-ppc@freebsd.org Subject: Re: Proposal to switch powerpc64le to IEEE-754 binary128 Message-ID: <CAJ-VmomxFEzuXuCitZd94csONR_m0oUv2O5fE-q4u4zRsFLSsg@mail.gmail.com> In-Reply-To: <aipwRlW1k4QBiDtp@talos-powerpc64le> References: <ah8sFn_mmGrJp9Ru@talos-powerpc64le> <CAJ-VmonbXXpq4TBZ38idRPVHM1h%2BSFChvyr3DhVjHkVeaw9KjA@mail.gmail.com> <aipwRlW1k4QBiDtp@talos-powerpc64le>
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On Thu, 11 Jun 2026 at 01:22, Piotr Kubaj <pkubaj@freebsd.org> wrote: > > On 26-06-10 18:53:11, Adrian Chadd wrote: > > So, a few of us chatted in IRC about it. > > > > * The minimum for PPC64LE was POWER7 anyway, right? > POWER8. Last I heard, POWER7 has issues with unaligned access, which is > vital on LE. All the toolchains assume POWER8 as given on ppc64le. > > * There's no easy way to deal with this in library versioning and > > such, so we should just rip the bandaid off > > * We can fix the ports as they come up. > Yes, and there's not much to fix. The good news is that reinstallation > won't be necessary, upgrade is just the usual buildworld + installworld. > > * people wishing to run stuff built on -15 or earlier should just run > > a userland jail. > > > > so given that! > > > > * Please include something to propose to put in UPDATING > The review at https://reviews.freebsd.org/D57388 includes UPDATING > entry. > > * Please explain what will happen with all the toolchains in -HEAD (eg > > all the gcc versions will use the right base type, we won't have gcc > > compiling a different ABI to llvm21, etc) > Compilers explicitly using C's long double will need updating. > Everything else will work as it is. I have tested bootstraps for Rust, > GHC, OpenJDK and SBCL - all of them work. GCC and LLVM will need to be > updated though to emit correct long double, otherwise code built with > them that also uses long double type will misbehave. I'm also currently > playing with ldc and it will also need to be updated. Ok, can you go investigate GCC and LLVM too? And go, maybe? Does go currently work on ppc64le? > > * Let's figure out when the flag day should be. > Since it's CURRENT, people should expect breakages, we can't provide > stability there. IMO it's better to do it sooner than later so that more > people can test it. If someone doesn't want to upgrade yet, we're not > Microsoft, we don't force upgrades. Hey if you're willing to drive it forward then great! We just need to make sure it gets done enough that we don't end up with half working toolchains in ports. -adrianhome | help
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