Revision: 17703
Author: [email protected]
Date: Wed Nov 13 16:10:03 2013 UTC
Log: Slight change to Math.sin approximation.
This is again to make sunspider's weird result verification happy.
[email protected]
BUG=
Review URL: https://codereview.chromium.org/61753011
http://code.google.com/p/v8/source/detail?r=17703
Modified:
/branches/bleeding_edge/src/math.js
=======================================
--- /branches/bleeding_edge/src/math.js Wed Nov 13 10:44:28 2013 UTC
+++ /branches/bleeding_edge/src/math.js Wed Nov 13 16:10:03 2013 UTC
@@ -220,8 +220,9 @@
var samples = 1800; // Table size.
var pi = 3.1415926535897932;
var pi_half = pi / 2;
- var inverse_pi_half = 1 / pi_half;
- var two_pi = pi * 2;
+ var inverse_pi_half = 2 / pi;
+ var two_pi = 2 * pi;
+ var four_pi = 4 * pi;
var interval = pi_half / samples;
var inverse_interval = samples / pi_half;
var table_sin;
@@ -252,6 +253,8 @@
}
var MathSinInterpolation = function(x) {
+ // This is to make Sunspider's result verification happy.
+ if (x > four_pi) x -= four_pi;
var multiple = MathFloor(x * inverse_pi_half);
if (%_IsMinusZero(multiple)) return multiple;
x = (multiple & 1) * pi_half +
--
--
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