[PATCH] avoid infinite recursion in maybe_warn_alloc_args_overflow (pr 78775)

[Jeff Law]

On 12/12/2016 06:36 PM, Martin Sebor wrote:
> The attached patch avoids infinite recursion when traversing phi
> nodes in maybe_warn_alloc_args_overflow by using a bitmap to keep
> track of those already visited and breaking out.
>
> Thanks
> Martin
>
> gcc-78775.diff
>
>
> PR tree-optimization/78775 - ICE in maybe_warn_alloc_args_overflow
>
> gcc/ChangeLog:
>
> 	PR tree-optimization/78775
> 	* calls.c (operand_signed_p): Add overload and avoid getting into
> 	infinite recursion when traversing phi nodes.
>
> gcc/testsuite/ChangeLog:
>
> 	PR tree-optimization/78775
> 	* gcc.dg/pr78775.c: New test.
So Richi asked for removal of the VR_ANTI_RANGE handling, which would 
imply removal of operand_signed_p.

What are the implications if we do that?

Jeff