[Bug tree-optimization/105983] Failure to optimize (b != 0) && (a >= b) as well as the same pattern with binary and

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105983

--- Comment #6 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #5)
> (In reply to Jakub Jelinek from comment #4)
> > --- gcc/match.pd.jj	2022-06-15 12:52:04.640981511 +0200
> > +++ gcc/match.pd	2022-06-15 15:28:55.916225336 +0200
> > @@ -2379,14 +2379,14 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
> >  
> >  /* y == XXX_MIN || x < y --> x <= y - 1 */
> >  (simplify
> > - (bit_ior:c (eq:s @1 min_value) (lt:s @0 @1))
> > + (bit_ior:c (eq:s @1 min_value) (lt:cs @0 @1))
> >    (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
> >         && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
> >    (le @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
> >  
> >  /* y != XXX_MIN && x >= y --> x > y - 1 */
> >  (simplify
> > - (bit_and:c (ne:s @1 min_value) (ge:s @0 @1))
> > + (bit_and:c (ne:s @1 min_value) (ge:cs @0 @1))
> >    (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
> >         && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
> >    (gt @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
> > 
> > fixes this.
> 
> But doesn't that regress
> 
> bool f(unsigned a, unsigned b)
> {
>     return (b != 0) & (a >= b);
> }

Ignore that - I'm confusing reports.