The state of glibc libm

[Jeff Law]

On 03/14/2012 10:30 AM, Joseph S. Myers wrote:
>
> I'd say that "better performance with the potential loss of accuracy"
> should be covered by -ffast-math - that GCC should generate direct use of
> fsin/fcos instructions for sin/cos for -O2 -funsafe-math-optimizations on
> x86_64, as it does on x86, unless there is some reason to think they would
> perform worse than the out-of-line implementation.
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.

Jeff