[Bug tree-optimization/68529] scev failed for while(i--)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68529

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-11-25
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed, mine.  This happens because get_inner_reference converts nchar_14
to sizetype and thus we analyze the evolution of (uint64_t) nchar_14 which
isn't affine unless we can prove nchar_14 will never wrap in its type (unsigned
int).