Perf test improvements for hex encode/decode

tests/perf/test-hex-encode.js

@@ -21,7 +21,7 @@ function test() {
     for (i = 0; i < 5000; i++) {
         // Assigning to 'res' avoids garbage collection of result; this is
         // intentional to avoid mixing string intern performance to the test.
-        res = Duktape.enc('hex', tmp2);
+        var res = Duktape.enc('hex', tmp2);
     }
 }
 

tests/perf/test-json-parse-hex.js

@@ -0,0 +1,36 @@
+if (typeof print !== 'function') { print = console.log; }
+
+function test() {
+    var tmp1 = [];
+    var tmp2 = [];
+    var i, n, buf;
+    var inp1, inp2;
+
+    print('build');
+    buf = Duktape.Buffer(1024);
+    for (i = 0; i < 1024; i++) {
+        buf[i] = Math.random() * 256;
+    }
+    tmp1 = String(buf);
+    for (i = 0; i < 1024; i++) {
+        tmp2.push(tmp1);
+    }
+    tmp2 = Duktape.Buffer(tmp2.join(''));
+
+    print(tmp2.length);
+    print('run');
+    inp1 = Duktape.enc('jx', { foo: tmp2 });
+    inp2 = Duktape.enc('jx', { foox: tmp2 });
+
+    for (i = 0; i < 1000; i++) {
+        var res1 = Duktape.dec('jx', inp1);
+        var res2 = Duktape.dec('jx', inp2);
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+    throw e;
+}

tests/perf/test-json-serialize-hex.js

@@ -0,0 +1,35 @@
+if (typeof print !== 'function') { print = console.log; }
+
+function test() {
+    var tmp1 = [];
+    var tmp2 = [];
+    var i, n, buf;
+
+    print('build');
+    buf = Duktape.Buffer(1024);
+    for (i = 0; i < 1024; i++) {
+        buf[i] = Math.random() * 256;
+    }
+    tmp1 = String(buf);
+    for (i = 0; i < 1024; i++) {
+        tmp2.push(tmp1);
+    }
+    tmp2 = Duktape.Buffer(tmp2.join(''));
+
+    print(tmp2.length);
+    print('run');
+    for (i = 0; i < 1000; i++) {
+        // Assigning to 'res1' and 'res2' avoids garbage collection of result;
+        // this is intentional to avoid mixing string intern performance to the
+        // test.  Test both hex alignments (internal fast loop is aligned by 2).
+        var res1 = Duktape.enc('jx', { foo: tmp2 });
+        var res2 = Duktape.enc('jx', { foox: tmp2 });
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+    throw e;
+}