Where does the Math library come from? I was thinking that it picks up GLIBC but I am not sure.

Given the sub-normal IEEE 754 number 2^(-1044)

        cbrt(0x1.0p-1044) = 0x1.0p-340 (exactly)


When I use my own cube root function which is done in a generic style, I get an exact answer as does C/C++. but under Chapel it returns an answer with a relative error of

        0.5*epsilon

I was curious where I should be looking. If Chapel is just using whatever is the latest version of the standard C library on a given machine, I will look in my test program.

Also, there is no 'nextafter' routine in Chapel's math library, a.k.a.

        man nextafter

but I can donate mine (done in Chapel) from my IEEE 754 project sometime soon.

Thanks - Damian

Pacific Engineering Systems International, 277-279 Broadway, Glebe NSW 2037
Ph:+61-2-8571-0847 .. Fx:+61-2-9692-9623 | unsolicited email not wanted here
Views & opinions here are mine and not those of any past or present employer


_______________________________________________
Chapel-developers mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/chapel-developers

Reply via email to