[ballen@uwm.edu] libc/2269: triginometric argument reductionerror in libm

[Bruce Allen]

On Sun, 20 May 2001, Geoff Keating wrote:

> Someone needs to fix libc/sysdeps/i386/fpu/s_sin.S so that it does
> proper range reduction, I think.  It works fine on non-x86 chips.
> 
> Intel's manual (I was looking at the 'Pentium Processor Family
> Developer's Manual, volume 3') has some spectacularly bad advice on
> how to do range reduction.  I would suggest ignoring it.

Geoff, 

Could you please give a URL for this manual?  I'm familiar enough with the
problems of range reduction to be interested in seeing how they got it
wrong.

Bruce