Archive: Altering OpenJDK Runtime Floating Point.
Budget
500$
per month
Posted: 5 years ago
Closed
- Description
- I am after one or an entity of what could be terms 'Java Sub-system developers' to alter and rebuild
two versions of the OpenJDK runtime to address the following issues:
In the Java OpenJDK version 11, floating point denormal and pronormal values result from arithmetic operations on float and double, Float and Double. The means of the floating point operations should be enhanced or replaced and rendered range accurate for the value results last decimal place. This all corresponds to the defaulting mode where the strictfp keyword is absent (strctfp mode should be left unchanged).
What I believe I am after is the floating point operations behaviour "modes" that Java 1.1 used to have. Maybe it will be enough, largely, to copy from those old instrinsics again, although what I am after is a change to 64 bit Java, not 32 bit, for now.
I presently desire that Windows 64 bit, Linux 64 bit and Mac 64 bit runtimes both be changed. It is my understanding that once the intrinsics involved are done for one OS version, it can be "pasted over" and rebuilt into the other OS versions.
I would like these floating point runtime alterations to be on a runtime fileset distinct from the compiler where possible. If not, the joint compiler and runtime kit can be kept together, the 'javac' and 'java' / 'javaw' commands. I would, in this regards, where posible, like to have both of these options.
Direct mode arithmetic on float, double, Float, Double, alongside the version of scientific or engineering notation that can commence to be used inside these types, as well as hexadecimal mode arithmetic, accessible via '0x', likely all need updating, to keep the least decimal place correct under floating point denormal and pronormal circumstances. The related operations will be:
+, -, *, /, %, ++x , --x, x++, x--, (, ), +=, -=, *=, /=, %=.
Operand order and bracket involvement may also be part of what has to be repairs.
java.lang.StrictMath will need to be updated so that all its method calls operate with full accurate performance for the values final decimal place via all function input values. If any of StrictMath contains the strictfp keyword, those will have have to be removed and compiled out, as might be needed with inside java.lang.Math.
I am not quite sure where they presently keep the source code,
resource files, and build script(s) for OpenJDK 11, yet I am aware they are publically available.
It is my hope that the updated results, possessing range accurate arithmetic operations, will load and accumulate in memory systematically, so that the relevant sub operations arrange well in memory, scale well with many such java (program level) operations, and that while the total result will be slower than floating point mode, things will continue to execute quite fast enough.
In keeping with the GPL OpenJDK license, the source code and resource files, as well as the built product, should be uploaded to Sourceforge or very similar. Everyone involved with the development can attach their names to the project online as they wish.
How about 'RPU JAVA' - Rational Place Updated Java as a name for it all?
**It would be very helpful if individual(s) involved can align toa GMT + 10:30 Australian Central
Standard Time timezone and are able to, during any particularly day, take part in continuing time-aligned discussions by email. Live chats and Skyping are not really an option given other restrictions involved.
I envisage a situation where the successful applicant will not wait to the end of the postage time period,
but will be notified, email exchanged with, and commence their task as promptly as becomes feasible.
Working conditions:
Fixed Price
$250-$500
Skills:
java,software development,java se
- Category
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