[Bug tree-optimization/82588] missing -Warray-bounds on a excessively large index

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82588

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=82455
         Resolution|---                         |FIXED

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
The -Warrray-bounds part of the issue has been fixed in r254830.  GCC now
issues the warnings below for the test case in comment #0:

a.c: In function ‘f1’:
a.c:17:11: warning: array subscript 4611686018427387904 is above array bounds
of ‘int[]’ [-Warray-bounds]
   return a[__SIZE_MAX__ / sizeof (int) + 1];   // missing -Warray-bounds
          ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.c: In function ‘f2’:
a.c:22:14: warning: array subscript 9223372036854775807 is above array bounds
of ‘char[]’ [-Warray-bounds]
   return a->a[__SIZE_MAX__ / 2];   // missing -Warray-bounds
          ~~~~^~~~~~~~~~~~~~~~~~

The out-of-bounds offset is still not diagnosed.  It's the subject of a
separate bug (pr82455).