gtbercea added a comment.

>   I don't want to use a fast `pow(a, 2)`, I don't want to call a library 
> function for that at all.

I do believe you won't end up calling a function. If you're compiling with 
optimizations on this will be inlined.


Repository:
  rC Clang

https://reviews.llvm.org/D47849



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