From 7dd97f6543fe53e92c5b671c49f3f021d75ff602 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@pobox.com>
Date: Mon, 4 Sep 2023 07:53:39 -0700
Subject: [PATCH] readme

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 readme.md | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 readme.md

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+# 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
+run is much slower on a randomly mixed array.
+
+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.
+
+```
+ % node speci.js
+** x_first
+run 1
+72 ms
+
+run 2
+15 ms
+
+run 3
+22 ms
+
+** y_first
+run 1
+73 ms
+
+run 2
+23 ms
+
+run 3
+20 ms
+
+** mixed
+run 1
+2766 ms
+
+run 2
+52 ms
+
+run 3
+53 ms
+
+** randomized
+run 1
+464 ms
+
+run 2
+445 ms
+
+run 3
+445 ms
+```