Avoid the Marsaglia effect in 3D

For a longer discussion, see the associated Chromium issue.

BUG=chromium:423311
LOG=y
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/662513004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24721 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

diff --git a/src/math.js b/src/math.js
index f06249d..13d030c 100644 (file)
--- a/src/math.js
+++ b/src/math.js
@@ -144,7 +144,7 @@ function MathPow(x, y) {
 // ECMA 262 - 15.8.2.14
 var rngstate;  // Initialized to a Uint32Array during genesis.
 function MathRandom() {
-  var r0 = (MathImul(18273, rngstate[0] & 0xFFFF) + (rngstate[0] >>> 16)) | 0;
+  var r0 = (MathImul(18030, rngstate[0] & 0xFFFF) + (rngstate[0] >>> 16)) | 0;
   rngstate[0] = r0;
   var r1 = (MathImul(36969, rngstate[1] & 0xFFFF) + (rngstate[1] >>> 16)) | 0;
   rngstate[1] = r1;