Hi, you cannot use SIMD registers in kernel as far as i know. The kernel does not save these registers when changing userspace/kernel mode (i think for performance reason) so these registers have to stay untouched when you are in kernel mode.
Regards, Joerg. On Do, 23.02.2006, 15:42, Torbjorn Granlund sagte: > I recently committed several GMP assembly functions for powerpc32 > using Altivec registers and instructions. > > I also reinstalled my system (a Pegasos2) recently, from an obsolete > snapshot I got from somebody on the net, to a much less obsolete > system. > > With the new assembly code *and* with the new GNU/Linux installation, > the system fails intermittently in GMP's make check. I don't know how > to debug such an intermittent failure. > > The same GMP code works correctly on Mac OS X. > > Debugging such an intermittent problem is close to impossible. > > Do you know if the Linux kernel correctly handles Altivec registers > during context switch? Does it require setting the VRSAVE special > register, BTW? (I set it properly, since Mac OS X needs it, and > setting it shouldn't hurt.) > > (The kernel on the system identifies itself as 2.6.12.) > > -- > Torbjörn > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact > [EMAIL PROTECTED] > > > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
