Merge pull request ethereumjs#409 from ethereumjs/exp-simplify

holgerd77 · web-flow · commit 71699922ad73 · 2019-01-04T09:03:21.000+01:00
Reorder EXP code to match other opcodes
diff --git a/lib/opFns.js b/lib/opFns.js
@@ -88,16 +88,15 @@ module.exports = {
     }
   },
   EXP: function (base, exponent, runState) {
-    var m = BN.red(utils.TWO_POW256)
-
-    base = base.toRed(m)
-
-    if (!exponent.isZero()) {
+    if (exponent.isZero()) {
+      return new BN(1)
+    } else {
       var bytes = 1 + logTable(exponent)
       subGas(runState, new BN(bytes).muln(runState._common.param('gasPrices', 'expByte')))
+
+      var m = BN.red(utils.TWO_POW256)
+      base = base.toRed(m)
       return base.redPow(exponent)
-    } else {
-      return new BN(1)
     }
   },
   SIGNEXTEND: function (k, val, runState) {
