Fix vectorizer ICE when building Mozilla

[Richard Guenther]

On Mon, 23 Apr 2012, Jan Hubicka wrote:

> Hi,
> when building Mozilla we ICE in expr_invariant_in_loop_p walking ARRAY_REF, because one of the
> fields is NULL (that is allowed)
> 
> Bootstrapped/regtested x86_64-linux, OK?

Ok with breaking the like before && - lines need to be less than 80 
columns.

Thanks,
Richard.

> Honza
> 
> 	* tree-ssa-loop-ivopts.c (expr_invariant_in_loop_p): Bail out at NULL tree refs.
> Index: tree-ssa-loop-ivopts.c
> ===================================================================
> *** tree-ssa-loop-ivopts.c	(revision 186688)
> --- tree-ssa-loop-ivopts.c	(working copy)
> *************** expr_invariant_in_loop_p (struct loop *l
> *** 1411,1417 ****
>   
>     len = TREE_OPERAND_LENGTH (expr);
>     for (i = 0; i < len; i++)
> !     if (!expr_invariant_in_loop_p (loop, TREE_OPERAND (expr, i)))
>         return false;
>   
>     return true;
> --- 1411,1417 ----
>   
>     len = TREE_OPERAND_LENGTH (expr);
>     for (i = 0; i < len; i++)
> !     if (TREE_OPERAND (expr, i) && !expr_invariant_in_loop_p (loop, TREE_OPERAND (expr, i)))
>         return false;
>   
>     return true;
> 
> 

-- 
Richard Guenther <rguenther@suse.de>
SUSE / SUSE Labs
SUSE LINUX Products GmbH - Nuernberg - AG Nuernberg - HRB 16746
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer