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#include <stdio.h>
#include <time.h>
float Q_rsqrt( float number )
{
long i;
float x2, y;
const float threehalfs = 1.5F;
x2 = number * 0.5F;
y = number;
i = * ( long * ) &y;
i = 0x5f3759df - ( i >> 1 );
y = * ( float * ) &i;
y = y * ( threehalfs - ( x2 * y * y ) );
return y;
}
int main() {
float number = 123.456f;
int iterations = 1000000;
int i;
clock_t start, end;
double time_taken;
start = clock();
for (i = 0; i < iterations; i++) {
Q_rsqrt(number);
}
end = clock();
time_taken = (double)(end - start) / CLOCKS_PER_SEC;
printf("Time taken: %f seconds\n", time_taken);
return 0;
}
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