float fastsqrt(float val) {
union
{
int tmp;
float val;
} u;
u.val = val;
u.tmp -= 1<<23; /* Remove last bit so 1.0 gives 1.0 */
/* tmp is now an approximation to logbase2(val) */
u.tmp >>= 1; /* divide by 2 */
u.tmp += 1<<29; /* add 64 to exponent: (e+127)/2 =(e/2)+63, */
/* that represents (e/2)-64 but we want e/2 */
return u.val;
}
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