Fourth Draft "Unsafe fp optimizations" project description.

[Geert Bosch]

On Sun, 12 Aug 2001, Linus Torvalds wrote:
  Hmm. As far as I know, the library routines at least in glibc do not add
  any accuracy.
  
  The library routines _do_ add:
   - "errno" handling
   - extended range by reduction of the argument size
  but not accuracy.

The way argument reduction is done affects accuracy for arguments
whose absolute value is larger than half pi.