[Bug middle-end/123560] Ternary introduces jump too easily, unnecessarily complex assembly

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123560

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
          Component|rtl-optimization            |middle-end

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I have not fully looked into why it was rejected but we do get:
```
IF-THEN-ELSE-JOIN block found, pass 1, test 2, then 3, else 4, join 5

IF-CASE-2 found, start 2, else 4
```
on ifcvt. So it looks like it was found but not turned. 


Note you can get what you want with:
```
int bla(int last_digit, uint32_t len) {
  int t = (last_digit != 0);
  t*=17;
    return t + (last_digit == 0) * (len - (len == 1));
}
```

Not fully because:
```
  _4 = len_13(D) == 1;
  _5 = (unsigned int) _4;
  _6 = len_13(D) - _5;
```

into `(len == 1) ? 0 : len`.