[Bug rtl-optimization/124355] New: canonicalize_condition creates an rtl and then sometimes throws it away right away

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124355

            Bug ID: 124355
           Summary: canonicalize_condition creates an rtl and then
                    sometimes throws it away right away
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: easyhack, internal-improvement, memory-hog
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

```
  /* We promised to return a comparison.  */
  rtx ret = gen_rtx_fmt_ee (code, VOIDmode, op0, op1);
  if (COMPARISON_P (ret))
    return ret;
  return 0;
```

This should just be:
```
/* We promised to return a comparison.  */
if ((GET_RTX_CLASS (code) & RTX_COMPARE_MASK) != RTX_COMPARE_RESULT)
  return 0;
return gen_rtx_fmt_ee (code, VOIDmode, op0, op1);
```