Julia example susing Tuples or Immutable that vectorize if patch http://reviews.llvm.org/D14185 is applied.

time_immutable.jl

import Base.rand

immutable Quad
    a :: Float32
    b :: Float32
    c :: Float32
    d :: Float32
end

@inline function add(x::Quad, y::Quad)
    Quad(x.a+y.a, x.b+y.b, x.c+y.c, x.d+y.d)
end

@inline function mul(x::Quad, y::Quad)
    Quad(x.a*y.a, x.b*y.b, x.c*y.c, x.d*y.d)
end

function muladd(x::Vector{Quad}, y::Vector{Quad}, z::Vector{Quad})
    @inbounds for i=1:length(x)
        x[i] = add(x[i],mul(y[i],z[i]))
    end
end

function rand(::Type{Quad},n::Integer)
    Quad[Quad(rand(Float32),rand(Float32),rand(Float32),rand(Float32)) for i=1:n]
end

a = rand(Quad,1000)
b = rand(Quad,1000)
c = rand(Quad,1000)

function flog(a,b,c)
    for i=1:1000
        muladd(a,b,c)
    end
end

@time flog(a,b,c)
@time flog(a,b,c)
@time flog(a,b,c)

time_tuple.jl

import Base.rand

Quad = Tuple{Float32,Float32,Float32,Float32}

@inline function add(x::Quad, y::Quad)
    (x[1]+y[1], x[2]+y[2], x[3]+y[3], x[4]+y[4])
end

@inline function mul(x::Quad, y::Quad)
    (x[1]*y[1], x[2]*y[2], x[3]*y[3], x[4]*y[4])
end

function muladd(x::Vector{Quad}, y::Vector{Quad}, z::Vector{Quad})
    @inbounds for i=1:length(x)
        x[i] = add(x[i],mul(y[i],z[i]))
    end
end

function rand(::Type{Quad},n::Integer)
    Quad[(rand(Float32),rand(Float32),rand(Float32),rand(Float32)) for i=1:n]
end

a = rand(Quad,1000)
b = rand(Quad,1000)
c = rand(Quad,1000)

function flog(a,b,c)
    for i=1:1000
        muladd(a,b,c)
    end
end

@time flog(a,b,c)
@time flog(a,b,c)
@time flog(a,b,c)