[Bug c/122031] New: gcc/tree-ssa-math-opts.cc:1661: Suspicious assignment

[dcb314 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122031

            Bug ID: 122031
           Summary: gcc/tree-ssa-math-opts.cc:1661: Suspicious assignment
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

A build of recent gcc trunk with clang says:

../trunk/gcc/tree-ssa-math-opts.cc:1661:7: warning: explicitly assigning value
of variable of type 'tree' (aka 'union tree_node *') to itself [-Wself-assign]

Source code is

              if (!((val_prec > rhs_prec && !unsigned_val_p && !unsigned_rhs_p)
                  || (type_prec > val_prec && !unsigned_p && !unsigned_val_p)))
                rhs = rhs;

This looks a bit odd to me.

git blame says:

7a5da9ab53a8 gcc/tree-ssa-math-opts.cc (Pan Li              2025-09-22 14:31:41
+0800 1661)         rhs = rhs;