Performance improvement for ascii to floating-point conversions with very

large exponents.

FossilOrigin-Name: 59bb999c8ba5e4ee7a4e388fc724b8606136d60c

src/util.c

@@ -382,6 +382,12 @@ do_atof_calc:
           result = s * scale;
           result *= 1.0e+308;
         }
+      }else if( e>=342 ){
+        if( esign<0 ){
+          result = 0.0*s;
+        }else{
+          result = 1e308*1e308*s;  /* Infinity */
+        }
       }else{
         /* 1.0e+22 is the largest power of 10 than can be 
         ** represented exactly. */