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In C Programming, We can enable/disable loop optimization using #pragma preprocessor directive.
In which scenario, loop optimization should turned off ?
Optimisation is off by default when you compile for debug (so that source code lines in the debugger exactly match the code being executed).
You would only use the pragma in very specific circumstances, such as:
You find an optimisation limitation/bug leading to undefined behaviour (What Every C Programmer Should Know About Undefined Behavior (Thanks to @R)
You need exact real-time timing