fix #7085

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/api/python/z3/z3printer.py

@@ -252,11 +252,11 @@ def _is_html_left_assoc(k):
 
 
 def _is_add(k):
-    return k == Z3_OP_ADD or k == Z3_OP_BADD
+    return k == Z3_OP_ADD or k == Z3_OP_BADD or k == Z3_OP_FPA_ADD
 
 
 def _is_sub(k):
-    return k == Z3_OP_SUB or k == Z3_OP_BSUB
+    return k == Z3_OP_SUB or k == Z3_OP_BSUB or k == Z3_OP_FPA_SUB
 
 
 if sys.version_info.major < 3:
@@ -890,9 +890,21 @@ def pp_fp(self, a, d, xs):
             if self.is_infix(k) and n >= 3:
                 rm = a.arg(0)
                 if z3.is_fprm_value(rm) and z3.get_default_rounding_mode(a.ctx).eq(rm):
-                    arg1 = to_format(self.pp_expr(a.arg(1), d + 1, xs))
-                    arg2 = to_format(self.pp_expr(a.arg(2), d + 1, xs))
+                    p = self.get_precedence(k)
                     r = []
+                    x = a.arg(1)
+                    y = a.arg(2)
+                    arg1 = to_format(self.pp_expr(x, d + 1, xs))
+                    arg2 = to_format(self.pp_expr(y, d + 1, xs))
+                    if z3.is_app(x):
+                        child_k = x.decl().kind()
+                        if child_k != k and self.is_infix(child_k) and self.get_precedence(child_k) > p:
+                            arg1 = self.add_paren(arg1)
+                    if z3.is_app(y):
+                        child_k = y.decl().kind()
+                        if child_k != k and self.is_infix(child_k) and self.get_precedence(child_k) > p:
+                            arg2 = self.add_paren(arg2)
+
                     r.append(arg1)
                     r.append(to_format(" "))
                     r.append(to_format(op))