Compiler Optimizes Frequently-used Temporary Variables into Registers for Faster Access
English version of the question
The compiler optimizes frequently used temporary variables (such as loop counters) into (49) to improve access speed. A. Registers B. Stack C. Heap D. Static storage area
Explanation
The access speed of computer storage units follows this order (fastest → slowest): Register > Cache > Main memory > External storage (hard disk / SSD)
Registers are built directly inside the CPU. The CPU can read and write data in registers immediately, without accessing main memory. Memory access is much slower and creates extra overhead.
Loop counters like i in for(int i=0; i<100; i++) are read and modified repeatedly. If we put this counter into a register, the CPU avoids frequent memory reads/writes and speeds up the whole program.
- Option A (Registers): ✅ Correct
- Option B (Stack): Stack is located in main memory. Accessing stack data still needs memory operations, not as fast as registers.
- Option C (Heap): Heap is also part of main memory, used for dynamically allocated data. Slow access.
- Option D (Static storage area): Static variables stay in main memory for the full runtime of the program, not for fast temporary loop variables
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