{"action":"opened","number":16969,"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/16969","id":74126961,"html_url":"https://github.com/JuliaLang/julia/pull/16969","diff_url":"https://github.com/JuliaLang/julia/pull/16969.diff","patch_url":"https://github.com/JuliaLang/julia/pull/16969.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/16969","number":16969,"state":"open","locked":false,"title":"Handle setfield! in alloc_elim_pass","user":{"login":"carnaval","id":5307791,"avatar_url":"https://avatars.githubusercontent.com/u/5307791?v=3","gravatar_id":"","url":"https://api.github.com/users/carnaval","html_url":"https://github.com/carnaval","followers_url":"https://api.github.com/users/carnaval/followers","following_url":"https://api.github.com/users/carnaval/following{/other_user}","gists_url":"https://api.github.com/users/carnaval/gists{/gist_id}","starred_url":"https://api.github.com/users/carnaval/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/carnaval/subscriptions","organizations_url":"https://api.github.com/users/carnaval/orgs","repos_url":"https://api.github.com/users/carnaval/repos","events_url":"https://api.github.com/users/carnaval/events{/privacy}","received_events_url":"https://api.github.com/users/carnaval/received_events","type":"User","site_admin":false},"body":"Probably does not come up very often but was added to allow for generic code with mutable accumulators such as\r\n```julia\r\nmut_zero(::Type{BigFloat}) = zero(BigFloat)\r\nfunction mut_add!(x::BigFloat, y::BigFloat)\r\n    ccall((:mpfr_add,:libmpfr), Int32, (Ptr{BigFloat}, Ptr{BigFloat}, Ptr{BigFloat}, Int32), &x, &x, &y, Base.MPFR.ROUNDING_MODE[end])\r\nend\r\n\r\nmut_zero(::Type{Float64}) = Ref(0.0)\r\nmut_add!(x,y) = x[] += y\r\nBase.convert(::Type{Float64}, r::Ref{Float64}) = r[]\r\n```\r\n\r\nthen write\r\n\r\n```julia\r\nfunction sum{T}(vs::Vector{T})\r\n    acc = mut_zero(T)\r\n    for v in vs\r\n        mut_add!(acc,v)\r\n    end\r\n    convert(T, acc)\r\nend\r\n```\r\n\r\nand get efficient scalar code in the Float64 case\r\n\r\n@andreasnoack 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