https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89223

David Malcolm <dmalcolm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-02-06
                 CC|                            |dmalcolm at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed via godbolt; this crashes GCC 5 onwards, including trunk.

It's failing this assertion here:

11731     /* Make sure the sign-extended value will fit in a HOST_WIDE_INT.  */
11732     gcc_assert (cst_and_fits_in_hwi (x));

where:

(gdb) call debug_tree (x)
 <integer_cst 0x7ffff1a15550 type <integer_type 0x7ffff18c6a80 __int128
unsigned> constant 0xfffffffffffffffffffffffffffffffe>

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