Wolfgang Denk <w...@denx.de> wrote on 17/10/2009 20:12:24: > > Dear Joakim Tjernlund, > > In message <OFC920E57F.DFABC29F-ONC1257652.00421E11-C1257652. > 00434...@transmode.se> you wrote: > > > > Anyone tried mixing hard and soft FP in on soft float CPU such as 83xx? > > Hm... most 83xx have a FPU.
Yeah, I meant 832x. These don't have a FPU > > > Been trying to figure out if this is a good idea or not. > > Any combinations that will or won't work? > > What exactly do you mean by "mixing"? You cannot (at least not with > any reasonable effort) mix hard and soft FP in the same application / > linked object. And it would be pretty difficult to setup separate > libraries for and all that stuff for both hard and soft FP binaries > in one system. I meant on per app or per lib basis, not within the same app/lib. > > I doubt if such a setup makes sense at all. > > > Generally I got soft FP in all system libs but there might be > > an binary application which will use hard FP. > > Recompile and relink it with soft-fp as well. Or ask the provider to > do that. That is what I am trying do/find out. The supplier claims that it should not be a problem and is ATM unwilling to recompile the app/libs. I am not convinced won't cause problems, not to mention performance degradation. > > > Is the MATH_EMU option in the kernel reliable(for 8xx too)? > > It's reliable enough to install and run standard distributions like > Debian, Ubuntu, or Fedora, but I have to admit that we haven't stress > tested any special FP test suites in such an environment. In everyday > use I didn't see any real issues, though. OK, but then you don't mix some libs/apps with soft and other apps/libs with hard FP? Jocke _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
