On Mon, 30 Aug 2021 at 13:34, Peter Maydell <peter.mayd...@linaro.org> wrote: > > # As noted, this does not actually cause problems on Linux, because > # unlike FreeBSD, Linux knows what the f*ck it is doing, and just > # ignores the upper bits exactly because of possible sign confusion. > > Whether that's still true a decade later I have no idea :-)
It wasn't even true a decade ago -- FreeBSD has ignored the upper bits since 2005[1]. That change included a warning if upper bits were set, but the warning is now hidden behind a diagnostic option. [1] URL: https://cgit.FreeBSD.org/src/commit/?id=9fc6aa0618a174f436fb1a26867c99cff4125b40
