whee

readme.md

@@ -1,12 +1,8 @@
 # speci.js - specialization benchmark test
 
 Tests two-property objects with {x, y} or {y, x} and access in a tight loop
-When the array contains consistent elements it optimizes well, but the first
+When the array contains consistent elements it optimizes well, but slows down
-run is much slower on a randomly mixed array.
+as you add variants, and slows down A LOT if you add other random properties
-
-Subsequent runs come up much faster as the higher-tier compilers in V8 can
-handle a couple of different variants -- but this might not be true of all
-possibilities. 256 randomized variants is linearly slower.
 
 ```
 % make test

speci.js

@@ -16,17 +16,22 @@ function doit(mode) {
         }
     }
 
-    function make_rand_prefix(x, y) {
-        let rando = (Math.random() * (2 ** 32 - 1)) | 0;
-        let r = 'random' + rando;
-        let o = {[r]: r, x, y};
-        return o;
-    }
-
     function make_rand_suffix(x, y) {
         let rando = (Math.random() * (2 ** 32 - 1)) | 0;
         let r = 'random' + rando;
         let o = {x, y, [r]: r};
+
+        // Equivalent to:
+        //let o = make_x_first(x, y);
+        //o[r] = r;
+
+        return o;
+    }
+
+    function make_rand_prefix(x, y) {
+        let rando = (Math.random() * (2 ** 32 - 1)) | 0;
+        let r = 'random' + rando;
+        let o = {[r]: r, x, y};
         return o;
     }