fast sqrt of type float
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float invSqrt(float x)
{
float xhalf=0.5f*x;
int i=*(int *)&x;
i=0x5f3759df-(i>>1);
x=*(float*)&i;
x=x*(1.5f-xhalf*x*x);
return x;
}
{
float xhalf=0.5f*x;
int i=*(int *)&x;
i=0x5f3759df-(i>>1);
x=*(float*)&i;
x=x*(1.5f-xhalf*x*x);
return x;
}
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