[Bug c/42146] ICE in tree_low_cst

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42146

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-07-04 15:35:45 UTC ---
tree_low_cst asserts something about the ability to represent the constant
in a HOST_WIDE_INT which has a target-specific (minimal) width.  In your
case HOST_WIDE_INT is 32bit where indeed 0x80000000 is not positive.
Now the question is what's the difference between the i686 x avr vs.
the native i686 behavior?

That's what you need to investigate.