Math trig intrinsics and compiler options

[Andrew John Hughes]

2009/8/7 Ian Rogers <ian.rogers at manchester.ac.uk>:
> 2009/8/6 Andrew John Hughes <gnu_andrew at member.fsf.org>:
>> 2009/8/6 Joseph D. Darcy <Joe.Darcy at sun.com>:
>>> My preferred long-term approach is to port the FDLIBM C code to Java, which
>>> I've wanted to do for a while, but has never bubbled to the top of my to-do
>>> list.
>>>
>>
>> I don't know the full history of it (perhaps mjw can shed some more
>> light), but as far as I'm aware, the Java StrictMath methods in GNU
>> Classpath were written as exactly this: Java versions of the fdlibm
>> code.  Developers of Java-based VMs such as JNode and JikesRVM
>> preferred these, because they didn't have to incur the cost of
>> dropping out to native code.
>
> Hi Andrew,
>
> I don't think we ever implemented this other than in the (never
> released) Jamaica port of Jikes RVM. Chris Kirkham did that port of
> fdlibm, perhaps he'd like to share the code :-)
>
> Ian
> --
> Metacircular JVM Research - http://mrp.codehaus.org/
>

At a naive glance, this:

http://cvs.savannah.gnu.org/viewvc/classpath/java/lang/StrictMath.java?root=classpath&view=markup

does seem to have the algorithms (at least <1.6) implemented in Java.
It even credits fdlibm.
-- 
Andrew :-)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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