JuliaLang/julia — comment on commit 82fb5617b09487b8c522cecd79aaa89efde4e74e
File:  line 0
By JeffBezanson:

A generalization of abs:

```
flipsign(x::Int64, z::Int64) = (y=z>>63; boxsi64(add_int(unbox64(x),unbox64(y)))$y)
```