[Bug tree-optimization/126695] New: Drop a redundant nested fmin or fmax

"ktkachov at gcc dot gnu.org via Gcc-bugs" <[email protected]> Thu, 06 Aug 2026 14:02:26 +0000

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126695

            Bug ID: 126695
           Summary: Drop a redundant nested fmin or fmax
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: easyhack, missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
  Target Milestone: ---

double f (double x, double y)
  { return __builtin_fmin (__builtin_fmin (x, y), y); }

Should generate on aarch64 just:
f:
        fminnm  d0, d0, d1
        ret