On 10/20/2015 03:12 AM, Segher Boessenkool wrote:
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).
Cool thanks. I figured this would be the case due to the nature of the
IPA framework.
jeff
