Sent from my iPhone
On Jan 22, 2009, at 1:00 AM, "bonzini at gnu dot org" <gcc-bugzi...@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
---
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CC| |rguenth at gcc dot
gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38932
