On Fri, Nov 28, 2014 at 12:58:55PM +1100, Benjamin Herrenschmidt wrote: > > Have you tested this with (upcoming) GCC 5.0? GCC now uses CR5, > > and it likes to use it very much, it might be more convenient to > > use e.g. CR1 (which is allocated almost last, only before CR0). > > We use CR1 all over the place in your asm code. Any other suggestion ? > > What's the damage of -ffixed-cr5 on gcc5 ? won't it just use CR4 or 6 > instead ?
Oh, it will work fine. Not using CR5 would be more convenient so that the register allocation for most code would not change when you use or not use -ffixed-cr5, making code easier to read. But your point about asm code already using the other CR fields makes CR5 a better choice actually, because people avoided it (because the compiler did) :-) Segher _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
