[Bug tree-optimization/121519] [16 Regression] ICE on valid code at -O3 on x86_64-linux-gnu: in upper_bound, at value-range.h:1186

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121519

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2025-08-12

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

#2  0x00000000018b5fbb in operator_lshift::op1_range (
    this=0x4b04a28 <op_lshift>, r=..., type=<integer_type 0x7ffff681d5e8 int>, 
    lhs=..., op2=...) at /space/rguenther/src/gcc-clean/gcc/range-op.cc:2868
2868          wide_int new_ub = wi::bit_or (up_mask, tmp_range.upper_bound ());
(gdb) p debug( tmp_range)
[irange] UNDEFINED