[Bug tree-optimization/128050] New: `X != C1 ? abs(X) : C2` match pattern does not match when the inner X has a cast involved

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128050

            Bug ID: 128050
           Summary: `X != C1 ? abs(X) : C2` match pattern does not match
                    when the inner X has a cast involved
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: easyhack, 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: ---

Testcase:
```
unsigned f(unsigned a)
{
  signed b = a;
  if (a == 0)
    return 0;
  b = __builtin_abs (b);
  return b;
}
unsigned f1(unsigned a)
{
  return a ? __builtin_abs(a) : 0;
}
```

The convert from unsigned to signed gets in the way.