This is the mail archive of the gcc-help@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: GCC's -ffast-math behavior

ä 2012/2/9 17:21, Andrew Haley åé:
On 02/09/2012 08:33 AM, xunxun wrote: 
         When using -ffast-math, gcc don't generate the math function
symbol: U _exp

No, it doesn't.  Instead gcc uses the F2XM1 instruction.  Why would
you want to call a library when gcc has an instruction to do the
job?

Andrew.


Because other math lib works faster than gcc itself (even with fastmath), and I want to use fastmath to make other caculation faster, too.

--
Best Regards,
xunxun

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]