Re: 4.7.0 regression? gcc.c-torture/execute/vla-dealloc-1.c failure.

[Richard Guenther <richard dot guenther at gmail dot com>]

On Thu, May 3, 2012 at 1:33 PM, Mailaripillai, Kannan Jeganathan
<kannanmj@hp.com> wrote:
> Hi,
>
> Similarly for the following two test case which deals with VLA
> de-allocation in a branch back situation:
> ?1. gcc.c-torture/execute/pr43220.c
> ?2. gcc.c-torture/execute/20040811-1.c

Can you try --param large-stack-frame=1?  Is sizeof (int) <= 2?

> Regards,
> Kannan
>
> -----Original Message-----
> From: Mailaripillai, Kannan Jeganathan
> Sent: Thursday, May 03, 2012 4:48 PM
> To: 'gcc@gcc.gnu.org'
> Subject: 4.7.0 regression? gcc.c-torture/execute/vla-dealloc-1.c failure.
>
> Hi,
>
> This is regarding gcc.c-torture/execute/vla-dealloc-1.c failure.
>
> 4.7.0 ia64-hp-hpux: ? ? ? program timed out (time out 300 seconds).
> 4.7.0 ia64-redhat-linux: ?program timed out (time out 300 seconds).
> 4.7.0 x86_64-suse-linux: ?execution completes successfully.
>
> Inserting a printf statement in the loop path makes the executable to
> complete executing without any issues.
>
> 4.6.3 ia64-hp-hpux: ? ? ? execution completes successfully.
>
> So it looks like a regression in 4.7.0. Any suggestion, which fix (check in)
> between 4.6.3 and 4.7.0 could have caused this failure?
>
> ==== gcc.c-torture/execute/vla-dealloc-1.c
>
> #if (__SIZEOF_INT__ <= 2)
> #define LIMIT 10000
> #else
> #define LIMIT 1000000
> #endif
>
> void *volatile p;
>
> int
> main (void)
> {
> ?int n = 0;
> ?if (0)
> ? ?{
> ? ?lab:;
> ? ?}
> ?int x[n % 1000 + 1];
> ?x[0] = 1;
> ?x[n % 1000] = 2;
> ?p = x;
> ?n++;
> ?if (n < LIMIT)
> ? ?goto lab;
> ?return 0;
> }
>
> Regards,
> Kannan
>