On 10/20/2015 05:00 PM, Jeff Law wrote: > But the technical reality is I can't see a use outside the extended asm.
I can. In the past (and probably still today) GCC did an awful job of allocating registers in a large function. This was visible in a bytecode interpreter, where the programmer knows that the virtual PC and SP should live in a register. GCC does not know this and is forever spilling them. Explicit local reg vars fixed this nicely. Andrew.
