Broadcast bug

```julia
julia> xs = [1.9, 1.0]
2-element Array{Float64,1}:
1.0
1.0

julia> max_ = maximum(xs, dims=1)
1-element Array{Float64,1}:
1.0

julia> exp_ = @avx exp.(xs .- max_)
2-element Array{Float64,1}:
1.0
2.7182818284590455

```

Start by reproducing the reported Julia snippet involving @avx exp.(xs .- max_), then trace how @avx handles the broadcast expression. The issue does not name files or tests; done should mean the expression produces the intended broadcast result and the regression is covered by a test.

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