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Feb30th1712 on 01/14/08


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c InvSqrt


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The famous InvSqrt()

Published in: C++ 

Unknown author

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  1. float InvSqrt (float x)
  2. {
  3.     float xhalf = 0.5F * x;
  4.     int i = * (int *) &x;
  5.     i = 0x5F3759DF - (i >> 1);
  6.     x = * (float *) &i;
  7.     x = x * (1.5F - xhalf * x * x);
  8.     return x;
  9. }

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