On Wed, May 4, 2011 at 7:50 PM, Robert Nelson <robertcnelson@xxxxxxxxx> wrote: > On Wed, May 4, 2011 at 1:46 PM, Jon Masters <jonathan@xxxxxxxxxxxxxx> wrote: >> Folks, >> >> I'd like to kick off a discussion about flags for ARMv7. My proposal >> here is that we treat v7hl as an entirely different architecture, and >> don't try any multi-arch kind of hacks (there isn't the established user >> base for Fedora ARM to justify doing any of those things at the moment). >> >> Things I think we should consider as a minimum: >> >> *). Little endian (obviously, but worth stating) (l) >> *). Cortex-A8 or higher fully compliant core(s) >> *). ARM VFP3 hardware floating point (h) >> *). ARM NEON Architecture > > Btw, if you make NEON mandatory, then we don't have to worry about the > "vfp3-d16" limitation of the tegra2 / dove and therefor go the full > "vfp3-d32"... (if you consider the Cortex-15 will have NEON by > default, it's a good minimal requirement..) I believe NEON is run time detectable just like SSE is, so there's no need to actually explicitly compile for NEON as if the processor has the capability and the code has the ability to optimise for it (ORC, pixman, cairo come to mind) there's code paths in the code that will just use it. In terms of dual core devices, in particular tablets, tegra2 is the currently one of the most used A9 based chipset. As NEON isn't a hard requirement of ARMv7 like hardfp is so there's nothing to say there won't be other chips that don't come with it (I believe there are others that don't have NEON too). Peter _______________________________________________ arm mailing list arm@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/arm
