[libcxx-commits] [libcxx] [libc++] Optimize string operator[] for known large inputs (PR #69500)

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EricWF wrote:

And what about for non-constant string indexes? Or what happens in a benchmark where you mix constant and non-constant indexes?

I would like this to be a little more thorough  

https://github.com/llvm/llvm-project/pull/69500