It is, but I created a form that forces it to not be inlined, and that
still runs in just 30 ms.
On Tuesday, January 20, 2015 at 4:57:00 PM UTC-6, Jeff Bezanson wrote:
>
> Oh, I should also mention that the version that calls goo(foo()) takes
> so little time because the entire loop is probably optimized out.
>
> On Tue, Jan 20, 2015 at 5:54 PM, Jeff Bezanson <jeff.b...@gmail.com
> <javascript:>> wrote:
> > Here is a hack that basically works by escaping through the C type
> system:
> >
> > ```
> > immutable CFunction{R,A}
> > f
> > p::Ptr{Void}
> > CFunction(f) = new(f, cfunction(f, R, (A,)))
> > end
> >
> > call{R,A}(f::CFunction{R,A}, x) = ccall(f.p, R, (A,), x)
> >
> > foo(x::Float64) = 0.0
> > goo(x::Float64) = x
> >
> > function test1()
> > for i=1:100000000
> > f = foo
> > r = f(1.0)
> > goo(r)
> > end
> > end
> >
> > function test2()
> > f = CFunction{Float64,Float64}(foo)
> > for i=1:100000000
> > r = f(1.0)
> > goo(r)
> > end
> > end
> > ```
> >
> > I added an argument to `foo` to increase the generality somewhat.
> > test1() is the original test case. test2() is the new version. The
> > CFunction object needs to be constructed outside the loop, but this
> > can be stored in a data structure and reused anywhere.
> >
> > -Jeff
> >
> >
> > On Tue, Jan 20, 2015 at 4:34 PM, Ivar Nesje <iva...@gmail.com
> <javascript:>> wrote:
> >> Originally posted at https://github.com/JuliaLang/julia/issues/9863
>
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