SIGFPE with FPE_FLTRES (original) (raw)

Christos Zoulas christos at zoulas.com
Thu Mar 26 18:34:55 UTC 2009

On Mar 26, 11:01am, Thomas.Rodriguez at Sun.COM (Tom Rodriguez) wrote: -- Subject: Re: SIGFPE with FPE_FLTRES

| > I would just remove the trancendental c implementation. It is not | > consistent | > with the java one anyway on amd64: || You've got that backwards. The C implementation is actually the | correct result as far as the spec goes and it's what is used by | StrictMath.log. Math.log is allowed to produce less strict results | but it's always correct to use the same implementation as | StrictMath.log. || > | > | > http://bugs.sun.com/bugdatabase/viewbug.do?bugid=6539464 | > | > It's been 2 years that this is has been open. I don't understand how | > come | > nobody else has hit this. My only guess is that people don't compare | > results | > from successive runs. || This is actually a bug in hotspot. The interpreter is using the C | implementation and compiled code is using the log instructions on x86 | but the interpreter and compiler are required to use the same | implementation so that Math.log is self consistent. The amd64 | interpreter has the code to use the x86 instruction but some code in | AbstractInterpreterGenerator::generatemethodentry keep it from | getting used. Anyway, I've refiled this into hotspot and it should be | fixed in an upcoming hotspot.

Thanks a lot for explanation!

christos

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