slight performance deterioration fixed (#177)

Author: sshin23

src/simdfunction.jl

@@ -24,8 +24,8 @@ struct SIMDFunction{F,C1,C2}
     o2step::Int
 end
 
-(sf::SIMDFunction{F,C1,C2})(i, x, θ) where {F,C1,C2} = sf.f(i, x, θ)
-(sf::SIMDFunction{F,C1,C2})(i, x, θ) where {F<:Real,C1,C2} = sf.f
+@inline (sf::SIMDFunction{F,C1,C2})(i, x, θ) where {F,C1,C2} = sf.f(i, x, θ)
+@inline (sf::SIMDFunction{F,C1,C2})(i, x, θ) where {F <: Real,C1,C2} = sf.f
 
 """
     SIMDFunction(gen::Base.Generator, o0 = 0, o1 = 0, o2 = 0)