From: Jeff Law <l...@redhat.com> Date: Wed, 14 Mar 2012 10:41:27 -0600
> The better performance with potential loss of accuracy is an across > the board request, it's not just a sin/cos issue. All the trig, exp, > pow, log, etc, which I don't think are necessarily covered by using > the old x87 fp unit. This is no surprise to me, vendors have commonly provided some kind of "optimized libm" library that provided better performance with less accuracy. For example, Sun has always had a variant of libm optimized in this way, called "libmopt", with it's SunPRO compilers.
