[cfe-dev] How to check if a variable is updated inside a loop?

[karan raj singh ranawat via cfe-dev]

If there is a variable outside a loop, and if it is used inside a loop. How
can I check in the LLVM analysis if the variable is getting modified inside
a loop iteration.
Ex: int i = 0;
for(;;i++){}
When there is i++, the load instruction updates existing i. How can I
identify if the load instruction is part of a loop.
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