John Fine wrote: > Andrew Haley wrote: >> jackfrost wrote: >> >>> Ian Lance Taylor-3 wrote: >>> >>>> Try -ffast-math. I think it's the default for icc when optimizing. >>>> >>> I've tried -ffast-math with the same result. >>> >> >> You're going to have to look at the generated assembler code. >> >> > > The generated assembler code wouldn't tell you anything. > > Almost all the CPU time is spent inside the exp() function. We haven't yet determined that. > I'm confident neither gcc nor Intel10 is inlining the exp() function, Why are you confident of that? With -ffast-math -O2 that is precisely what gcc will do. That's why Ian suggested it. Andrew.
