REGRESSION: java_lang/math/CubeRootsTest starts failing in mustang b30

JDK : mustang b30 (pass with b29)
OS : WinXP home
switch : fail with -server -Xcomp
               pass with -server -Xint, -client -Xmixed

Test Harness: Tonga 2.0
Testbase : /net/jsqalab/export/testsuites/SQE6.0/b02/6.0/libs
Failed case : java_lang/math/CubeRootsTest

How to reproduce:
=================
CubeRootsTest.java is attached. compile it and run with "-server -Xcomp" to reproduce the bug.

Error messages:
====================
Y:\dtf\unified\results\export5\mustang\b30\libs\6.0-libs-winXPhome_c2-2005-04-05
-10-16-12-0995\tonga.output\rerun\dtftest.Windows_XP.x86\CubeRootsTest>c:/jdk/b3
0/windows-i586/jdk1.6.0/bin/java -server -Xcomp CubeRootsTest
Total tests for CubeRootsTest : 1
1.431435383E12 cbrt not ok
Exception thrown = java.lang.Exception: check !=0 not ok in CubeRootsTestTest01(
)
CubeRootsTestTest01() CubeRootsTest.java Fail
java.lang.Exception: check !=0 not ok in CubeRootsTestTest01()
        at CubeRootsTest.CubeRootsTestTest01(CubeRootsTest.java:147)
        at CubeRootsTest.main(CubeRootsTest.java:56)
Pass count: 0
Fail count: 1
Test for CubeRootsTest.java Failed
###@###.### 2005-04-05 23:45:57 GMT