[Bug tree-optimization/114203] [13/14 Regression] Miscompilation: A possible miscompilation in GCC 13 and 14 with option -Os

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114203

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |tree-optimization
   Last reconfirmed|                            |2024-03-02
                 CC|                            |pinskia at gcc dot gnu.org
     Ever confirmed|0                           |1
   Target Milestone|---                         |13.3
           Keywords|                            |needs-bisection, wrong-code
            Summary|Miscompilation: A possible  |[13/14 Regression]
                   |miscompilation in GCC 13    |Miscompilation: A possible
                   |and 14 with option -Os      |miscompilation in GCC 13
                   |                            |and 14 with option -Os
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
final value replacement:
  c_7 = PHI <c_2(4)>
 with expr: b_3(D) != 0 ? 32 - __builtin_clz ((unsigned int) b_3(D)) : 24

24 is definitely wrong here. It should have been 0.