On Thu, Jan 25, 2007 at 03:24:56PM -0600, Adam Litke wrote:
> Hmm. On x86, sometimes gcc will optimize out the alloca() call. This
> patch fixes it up nicely. Please apply.
>
> Signed-off-by: Adam Litke <[EMAIL PROTECTED]>
>
> diff --git a/tests/stack_grow_into_huge.c b/tests/stack_grow_into_huge.c
> index fc8a030..7112428 100644
> --- a/tests/stack_grow_into_huge.c
> +++ b/tests/stack_grow_into_huge.c
> @@ -49,6 +49,7 @@ void do_child()
> {
> while (1) {
> alloca(16*1024*1024);
> + sleep(0); /* Defeat the gcc optimizer */
> }
> }
Hrm, that's a little strangely magical. I'd suggest instead doing:
volatile int *x;
x = alloca(lots);
*x = 1;
Then it's clear that the compiler is forbidden from eliding the
alloca().
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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