I am trying to optimize the loop performance by reducing the number of 
bound checks. Inside the loop I compute a slice index and access two slice 
indexes like this:

j := i / 2
s[j+1] = i
s[j] = i // <- I want to get rid of this bound check

I assumed that I can get rid of the second bound check, as the compiler 
could already know that j+1 < len(s) and j >= 0. Am I missing something? 
Any suggestions how to solve this?

The full boiled down code to reproduce my issue is here: 
https://go.godbolt.org/z/hsjPh3WT7

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