[Bug tree-optimization/103690] [12 Regression] ICE: in build2, at tree.c:4985 with -g -O2 -fno-tree-dce -fno-tree-dse -fno-tree-fre --param=max-jump-thread-duplication-stmts=94

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103690

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-12-13

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(gdb) p debug_gimple_stmt(stmt)
_67 = _14 + _66;


Before pre had:
  intD.9 * __trans_tmp_1D.2946;
....
  # RANGE [1, 9223372036854775807] NONZERO 9223372036854775804
  _66 = (long unsigned intD.16) _17;
  # PT = nonlocal escaped
  # ALIGN = 4, MISALIGN = 0
  _67 = __trans_tmp_1_14 + _66;

But after:
  # RANGE [1, 9223372036854775807] NONZERO 9223372036854775804
  _66 = (long unsigned intD.16) _17;
  # PT = nonlocal escaped
  # ALIGN = 4, MISALIGN = 0
  _67 = _14 + _66;

We already removed the definition of _14 too:
Removing dead stmt __trans_tmp_1_14 = _24 + 4;

So it is the order of the removal which is causing issues.