On Thu, Oct 17, 2013 at 12:03:23PM +0200, Andrew Jones wrote: > On Wed, Oct 16, 2013 at 06:06:29PM -0700, Christoffer Dall wrote: > > On Mon, Oct 14, 2013 at 06:23:33PM +0200, Andrew Jones wrote: > > > arm can't do arbitrary divisions without software support. Usually > > > libgcc would jump in here, but depending on the toolchain used that may > > > or may not work. Luckily, we only care about two types of divisions. > > > Divide by 10 and divide by 16. Divide by 16 is already covered by gcc > > > since it's a power of two. Divide by 10 can be hacked up using a > > > multiplication and shift. > > > > Isn't this just a matter of supplying a few libc implementations to > > handle div_by_0 and that sort? I'm pretty sure we had that working in > > the kvm-selftest for ARM thingy that allowed you to use the standard '/' > > operator in C code.... I suspect there will be more users of this > > eventually. > > > > Or wait, do you mean 'long long' operations by arbitrary? In that case, > > I'm less sure... A library implementation to support the operator would > > still be preferred IMHO. > > No, that's not what I meant, nor can I pretend that's what I meant now :-) > I saw that you had brought lib1funcs.S into kvm-selftest, but I'm not sure > why I rejected doing the same thing... Probably because my reflex was to > not adopt a bunch of assembler that I didn't want to maintain. But I guess > there's nothing to maintain there. It works, and will always work. I'll > switch to using it. > I think so, and I'll gladly help you maintain those bits. -Christoffer -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
