Merge pull request #40343 from kdlong/from-CMSSW_13_0_0_pre2

Fix -1 precision in SimpleFlatTableProducer

Author: cmsbuild

PhysicsTools/NanoAOD/interface/SimpleFlatTableProducer.h

@@ -53,14 +53,15 @@ class FuncVariable : public Variable<ObjType> {
   void fill(std::vector<const ObjType *> &selobjs, nanoaod::FlatTable &out) const override {
     std::vector<ValType> vals(selobjs.size());
     for (unsigned int i = 0, n = vals.size(); i < n; ++i) {
+      ValType val = func_(*selobjs[i]);
       if constexpr (std::is_same<ValType, float>()) {
         if (this->precision_ == -2) {
-          vals[i] = MiniFloatConverter::reduceMantissaToNbitsRounding(func_(*selobjs[i]), precisionFunc_(*selobjs[i]));
-        } else {
-          vals[i] = func_(*selobjs[i]);
-        }
+          auto prec = precisionFunc_(*selobjs[i]);
+          vals[i] = prec > 0 ? MiniFloatConverter::reduceMantissaToNbitsRounding(val, prec) : val;
+        } else
+          vals[i] = val;
       } else {
-        vals[i] = func_(*selobjs[i]);
+        vals[i] = val;
       }
     }
     out.template addColumn<ValType>(this->name_, vals, this->doc_, this->precision_);