[Bug tree-optimization/126827] New: Missing vrp due to builtin calls are not all handled (only handled in nonnegative)

"pinskia at gcc dot gnu.org via Gcc-bugs" <[email protected]> Wed, 12 Aug 2026 21:06:13 +0000

Newsgroups	gmane.comp.gcc.bugs
Message-ID	<[email protected]/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126827

            Bug ID: 126827
           Summary: Missing vrp due to builtin calls are not all handled
                    (only handled in nonnegative)
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 126814
  Target Milestone: ---

Take:
```
double f(double a)
{
    if (a > 0)
    {
      a = __builtin_ceil(a);
      if (a < 0)
        __builtin_trap();
    }
    return a;
}
```

the condition leading to trap should be removed.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126814
[Bug 126814] [17 Regression] ICE in RTL expand in fill_ranger_cache at
gimple-range-cache.cc:1658 since r17-3171