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* [Bug AWT/16825] New: Bad results for QuadCurve2D.solveQuadratic
@ 2004-07-29 21:10 mark at gcc dot gnu dot org
2005-08-24 23:49 ` [Bug awt/16825] need to reimplement QuadCurve2D.solveQuadratic fitzsim at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: mark at gcc dot gnu dot org @ 2004-07-29 21:10 UTC (permalink / raw)
To: java-prs
The method java.awt.geom.QuadCurve2D.solveQuadratic sometimes does not return
the right results for the following equation:
(x^2)/10 + 20x + 1000 = 0
Expected result: -100
This equation is tested by Mauve; see gnu.testlet.java.awt.geom.QuadCurve2D.
The problem occurs with various versions of gcj, compiling for IA-32. However,
it does NOT occur when executing the same Mauve testlet on jamvm, using the same
implementation for java.awt.geom.QuadCurve2D.
It turned out that a small Java test program for computing the equation's
discriminant gives a very small negative number when run on gcj/IA-32, but
exactly zero when run on jamvm or the Sun J2SE 1.4.1_01.
This bug report comes from GNU Classpath:
https://savannah.gnu.org/bugs/index.php?func=detailitem&item_id=7123
(Please see the very large audit trail there for more information.)
--
Summary: Bad results for QuadCurve2D.solveQuadratic
Product: gcc
Version: 3.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: AWT
AssignedTo: fitzsim at redhat dot com
ReportedBy: mark at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16825
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2006-08-02 10:56 UTC | newest]
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2006-08-02 10:56 ` [Bug awt/16825] need to reimplement QuadCurve2D.solveQuadratic aph at gcc dot gnu dot org
2004-07-29 21:10 [Bug AWT/16825] New: Bad results for QuadCurve2D.solveQuadratic mark at gcc dot gnu dot org
2005-08-24 23:49 ` [Bug awt/16825] need to reimplement QuadCurve2D.solveQuadratic fitzsim at redhat dot com
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