On Mon, Oct 19, 2015 at 11:14:30PM -0600, Jeff Law wrote:
> >>+All global register variable declarations must precede all function
> >>+definitions. If such a declaration appears after function definitions,
> >>+the declaration would be too late to prevent the register from being used
> >>+for other purposes in the preceding functions.
> >
> >This isn't true anymore, not even with -fno-toplevel-reorder or -O0.
> I've asked David to verify this. However, if you have, then he doesn't
> need to re-confirm.
- - -
int f(int a, int b) { int t = a + b; return t*t + a + b; }
register int nope asm("9");
- - -
on PowerPC (GPR9 is the first one allocated, adjust for other archs).
Segher
