[Bug middle-end/38932] ICE in set_value_range, at tree-vrp.c:398
pinskia at gmail dot com
gcc-bugzilla@gcc.gnu.org
Thu Jan 22 09:17:00 GMT 2009
------- Comment #5 from pinskia at gmail dot com 2009-01-22 09:17 -------
Subject: Re: ICE in set_value_range, at tree-vrp.c:398
Sent from my iPhone
On Jan 22, 2009, at 1:00 AM, "bonzini at gnu dot org" <gcc-bugzilla@gcc.gnu.org
> wrote:
>
>
> ------- Comment #4 from bonzini at gnu dot org 2009-01-22 09:00
> -------
> In PRE there is a fold_convert_const_int_from_int call simplifying
> "(signed
> char) 249" to -7, but setting the TREE_OVERFLOW flag in the
> meanwhile. I
> don't think it makes sense to set the overflow flag on a NOP:
Yes but changing that right now opens lots of bags of worms. It has
been tried before. The simple way to fix this is in pre unset
TREE_OVERFLOW because at this point in the IR it does not matter. I
hope someone would change vrp to do the correct thing but I guess that
won't happen any time soon.
Thanks,
Andrew Pinski
>
>
> * `The result of, or the signal raised by, converting an integer
> to a
> signed integer type when the value cannot be represented in an
> object of that type (C90 6.2.1.2, C99 6.3.1.3).'
>
> For conversion to a type of width N, the value is reduced modulo
> 2^N to be within range of the type; no signal is raised.
>
> (Integers implementation, from the gcc manual).
>
>
> --
>
> bonzini at gnu dot org changed:
>
> What |Removed |Added
> ---
> ---
> ----------------------------------------------------------------------
> CC| |rguenth at gcc dot
> gnu dot
> | |org
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38932
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38932
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