On Sun, 2005-02-27 at 18:40 -0500, Andrew Pinski wrote: > On Feb 27, 2005, at 6:35 PM, David Edelsohn wrote: > > > As Andrew Pinski mentioned, you also can use -mcpu=970 > > -mno-altivec. That should allow the assembler to accept Altivec > > instructions, but GCC will not know about any Altivec registers for > > inlined assembly parameters. > > As I and Ben found out that does not work, altivec is still turned on > and there is no way to turn it off. Alan has a patch which he is going > to post (again) on my request to fix the problem with "-mcpu=power4 > -maltivec", > I don't know if -mno-altivec will work though.
Ok. What I need is -mcpu=power4 -maltivec Later on, if we end up having another CPU with altivec for which we wish to provide a specific -mcpu=<....> option for optimization, we'll have to add -mno-altivec. The issue then will be, can we have -mno-altivec in the main Makefile CFLAGS and "override" this with -maltivec on a single file (the RAID6 code). The way the kernel makefiles work, this won't be simple unless gcc can grok -mno-altivec -maltivec with the later overriding the former... Ben.
