[Bug tree-optimization/110637] New: (type)(zeroonep !=/== 0) should be optimized as (type)zeroonep/zeroonep^1 earlier than vrp

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110637

            Bug ID: 110637
           Summary: (type)(zeroonep !=/== 0) should be optimized as
                    (type)zeroonep/zeroonep^1 earlier than vrp
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int f(int t)
{
 t &= 1;
 return t != 0;
}
```
Currently this only gets optimized at -O2 (due to VRP) to:
  _4 = t_1(D) & 1;
  return _4;

Likewise for:
```
int g(int t)
{
 t &= 1;
 return t == 0;
}
```

This was originally how I was going to solve PR 110539 but when we should
optimize to those gets in the way of other optimizations so I decided to fix PR
110539 a different way.