Advanced
C++
Q99 / 100
What is the "as-if" rule in C++ optimization?
Correct! Well done.
Incorrect.
The correct answer is B) Compilers may transform code in any way as long as the observable behavior (I/O, volatile accesses, thread synchronization) is unchanged
B
Correct Answer
Compilers may transform code in any way as long as the observable behavior (I/O, volatile accesses, thread synchronization) is unchanged
Explanation
The as-if rule allows loop unrolling, function inlining, dead code elimination, and instruction reordering as long as the final observable behavior matches the abstract machine.
Progress
99/100