fast_log_2
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#include <stdio.h>
int fast_log_2(int x)
{
float f;
unsigned long d, ex;
f = (float)x;
d = *(unsigned long *)&f;
ex = (d>>23) & 0xFF;
return ex - 127;
}
int main(void) {
printf("Hello World! %d\n", fast_log_2(255));
return 0;
}
C
INFO