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designerzen/inv_sqrt.c

Created September 4, 2022 20:00
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Fastest inverse square root
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inv_sqrt.c
float inv_sqrt(float x)
{ union { float f; uint32 u; } y = {x};
y.u = 0x5F1FFFF9ul - (y.u >> 1);
return 0.703952253f * y.f * (2.38924456f - x * y.f * y.f);
}
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