Bug ID: JDK-8134780 Port fdlibm to Java, part 1

JDK-8134780 : Port fdlibm to Java, part 1

Type: Enhancement
Component: core-libs
Sub-Component: java.lang
Affected Version: 9

Priority: P3
Status: Resolved
Resolution: Other

Submitted: 2015-08-31
Updated: 2024-01-22
Resolved: 2016-12-18

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JDK 9
9Resolved

Related Reports

Duplicate :	JDK-8042716 - Java port of fdlibm 5.3 to java.lang.StrictMath
Relates :	JDK-8160294 - Some client libraries cannot be built with GCC 6
Relates :	JDK-8183173 - Add private constructors to Fdlibm-internal classes
Relates :	JDK-6908131 - Pure Java implementations of java.lang.StrictMath.floor(double) & java.lang.StrictMath.ceil(double)
Relates :	JDK-7175279 - Don't use x87 FPU on x86-64
Relates :	JDK-8212880 - Cannot access ftp: site for fdlibm.tar
Relates :	JDK-8324296 - Reconsider the need for math StubRoutines after fdlibm ports
Relates :	JDK-8171407 - Port fdlibm to Java, part 2

Sub Tasks

JDK-7130085 :	Port fdlibm hypot to Java - Resolved
JDK-8134795 :	Port fdlibm pow to Java - Resolved
JDK-8136799 :	Port fdlibm cbrt to Java - Resolved
JDK-8139688 :	Port fdlibm exp to Java - Resolved

Description

The java.lang.StrictMath libraries require use of the FDLIBM algorithms for some methods:

* sin, cos, tan
* asin, acos, atan
* sinh, cosh, tanh
* log, exp, log10
* cbrt
* atan2
* pow
* hypot
* expm1, log1p

These algorithms are implemented in C and it would be advantageous to implement them in Java instead.

Comments

The port to fdlibm is partially done under JDK 9; the remainder will be done in a future release under JDK-8171407.
18-12-2016
FC Extension Request The remaining work is to apply the same techniques which have already been successfully used to port the FDLIBM pow, hypot, and cbrt functions to exp, log, sin, cos, etc. The ported functions have much better performance (no Java <-> JNI transitions) and will remove the need to maintain a particularly troublesome piece of native code (JDK-4294714, JDK-8074816, etc.). Therefore, I judge this effort to be low risk and able to be completed by August 15, 2016 (work is expected to proceed function by function interspersed with other work).
24-06-2016
Can we do fmod as well? See JDK-8015396 and JDK-8145543.
11-01-2016
Nice! I didn't know you are actively working on this. Right now there is no Fix Version. Any chance to get this into 9?
13-11-2015