What is more efficient? Using pow to square or just multiply it with itself?
In C, using x * x for squaring is generally more efficient than using pow(x, 2) because pow involves a function call with additional overhead.
However, in C , both approaches can be efficient due to compiler optimizations:
pow(x, 3) vs. x x x
In C , pow(x, 3) and x * x * x are usually equivalent in terms of efficiency. C 's std::pow function takes a more generic form (pow(double, double)), which handles exponents as floating-point numbers.
Specific Considerations:
Here are the updated benchmarks for GCC and Clang, testing efficiency for different exponents:
Exponent | GCC (O3) | Clang (O3) |
---|---|---|
2 | x * x slightly faster | Similar |
3 | x * x * x faster | Similar |
4 and above | x * x * x * ... faster | Similar |
Additional Notes:
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