[Bug tree-optimization/88272] warning: iteration 9223372036854775807 invokes undefined behavior

rguenth at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri Nov 30 08:34:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88272

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

           What    |Removed                     |Added
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           Keywords|                            |diagnostic

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Where do we set the cut-off? ;)

Btw, it's warning from do_warn_aggressive_loop_optimizations and:

      /* Only warn if undefined behavior gives us lower estimate than the
         known constant bound.  */
      || wi::cmpu (i_bound, wi::to_widest (loop->nb_iterations)) >= 0

that looks backwards?


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