On 05/04/12 06:39, Camm Maguire wrote:
> I'm wondering if there is a simple configure time test to detect when
> this has been fixed. If I just aborted using __builtin___clear_cache if
> it is in fact a noop on alpha, ppc, ppc64, and ia64, would this suffice?
I can't think of any simple, portable test.
The only reliable test would be to actually attempt to flush a cache,
with some detectable way to see this didn't happen. This tends to get
highly target specific quickly...
A pattern that would at least apply to 32-bit insn word risc might be
int test_routine[2] = {
"mov 1, v0"
"ret"
};
#define call_test ((int (*)(void))test_routine)
int main()
{
call_test(); // make sure the routine is in icache
test_routine[0] = "mov 0, v0";
__builtin__clear_cache(test_routine, test_routine+2);
return call_test();
}
for target-dependent values of those instructions.
r~
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