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Re: C Compiler benchmark: gcc 4.6.3 vs. Intel v11 and others
"willus.com" <email@example.com> writes:
>> 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.
Also, of course, "-ffast-math" is really shorthand for a bunch of more
detailed options; which are OK and which are not is often very
One can easily fine-tune the result by either using the more detailed
options instead of -ffast-math, or perhaps by specifying -ffast-math and
then turning _off_ (with -fno-xxx) anything that's too risky....
`There are more things in heaven and earth, Horatio,
Than are dreamt of in your philosophy.'