From 43a35b005f9f4631dd97a9db0f41ad76eaed941e Mon Sep 17 00:00:00 2001
From: Steven Guerrero <stephenguerrero43@gmail.com>
Date: Mon, 7 Dec 2020 08:27:25 -0500
Subject: perf: use minimal op with performance.now() (#8619)

---
 cli/rt/11_timers.js      | 5 ++++-
 cli/rt/40_performance.js | 3 +--
 2 files changed, 5 insertions(+), 3 deletions(-)

(limited to 'cli/rt')

diff --git a/cli/rt/11_timers.js b/cli/rt/11_timers.js
index c762c59d8..5a59844a3 100644
--- a/cli/rt/11_timers.js
+++ b/cli/rt/11_timers.js
@@ -3,6 +3,7 @@
 ((window) => {
   const assert = window.__bootstrap.util.assert;
   const core = window.Deno.core;
+  const { sendSync } = window.__bootstrap.dispatchMinimal;
 
   function opStopGlobalTimer() {
     core.jsonOpSync("op_global_timer_stop");
@@ -16,8 +17,10 @@
     await core.jsonOpAsync("op_global_timer");
   }
 
+  const nowBytes = new Uint8Array(8);
   function opNow() {
-    return core.jsonOpSync("op_now");
+    sendSync("op_now", 0, nowBytes);
+    return new DataView(nowBytes.buffer).getFloat64();
   }
 
   function sleepSync(millis = 0) {
diff --git a/cli/rt/40_performance.js b/cli/rt/40_performance.js
index 3d8be6031..0a63dc704 100644
--- a/cli/rt/40_performance.js
+++ b/cli/rt/40_performance.js
@@ -43,8 +43,7 @@
   }
 
   function now() {
-    const res = opNow();
-    return res.seconds * 1e3 + res.subsecNanos / 1e6;
+    return opNow();
   }
 
   class PerformanceEntry {
-- 
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