On Fri, Feb 20, 2009 at 6:39 AM, Dan Doel <dan.d...@gmail.com> wrote:
> Sorry for replying to myself, but I got suspicious about the 6ms runtime of > the 64-bit C++ code on my machine. So I looked at the assembly and found > this: > > .LCFI1: > movabsq $499999999500000000, %rsi > movl $_ZSt4cout, %edi > pushq %r12 > > I'm no assembly guru, but that makes me think that there's no actual > computation going on in the runtime for the 64-bit C++ program, whereas the > 32-bit one is clearly doing work on my system, since it takes around 1 > second. > > Not that I'd be sad if GHC could reduce that whole constant at compile > time, > but GCC isn't doing 1 billion adds in 6 (or even 60) milliseconds. The GCC optimizer must know that you can't return a value to user space of that large as a return result. In Haskell you're printing it... why not print it in C++? > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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