On 1/18/2012 10:37 PM, Marc Glisse wrote:
On Wed, 18 Jan 2012, willus.com wrote:
For those who might be interested, I've recently benchmarked gcc
4.6.3 (and 3.4.2) vs. Intel v11 and Microsoft (in Windows 7) here:
http://willus.com/ccomp_benchmark2.shtml
http://en.wikipedia.org/wiki/Microsoft_Windows_SDK#64-bit_development
For the math functions, this is normally more a libc feature, so you
might get very different results on different OS. Then again, by using
-ffast-math, you allow the math functions to return any random value,
so I can think of ways to make it even faster ;-)
I use -ffast-math all the time and have always gotten virtually
identical results to when I turn it off. The speed difference is
important for me.
