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30p87 , 1 month ago Yes, but it’s unsafe, therefore not really Rust I’d argue it doesn’t look as good <span style="color:#323232;">float Q_rsqrt(float number) { </span><span style="color:#323232;"> long i; </span><span style="color:#323232;"> float x2, y; </span><span style="color:#323232;"> const float threehalfs = 1.5F; </span><span style="color:#323232;"> </span><span style="color:#323232;"> x2 = number * 0.5F; </span><span style="color:#323232;"> y = number; </span><span style="color:#323232;"> </span><span style="color:#323232;"> i = * ( long * ) &y; </span><span style="color:#323232;"> i = 0x5f3759df - ( i >> 1 ); </span><span style="color:#323232;"> y = * ( float * ) &i; </span><span style="color:#323232;"> </span><span style="color:#323232;"> y = y * ( threehalfs - ( x2 * y * y ) ); </span><span style="color:#323232;"> return y; </span><span style="color:#323232;">} </span>
Yes, but
<span style="color:#323232;">float Q_rsqrt(float number) { </span><span style="color:#323232;"> long i; </span><span style="color:#323232;"> float x2, y; </span><span style="color:#323232;"> const float threehalfs = 1.5F; </span><span style="color:#323232;"> </span><span style="color:#323232;"> x2 = number * 0.5F; </span><span style="color:#323232;"> y = number; </span><span style="color:#323232;"> </span><span style="color:#323232;"> i = * ( long * ) &y; </span><span style="color:#323232;"> i = 0x5f3759df - ( i >> 1 ); </span><span style="color:#323232;"> y = * ( float * ) &i; </span><span style="color:#323232;"> </span><span style="color:#323232;"> y = y * ( threehalfs - ( x2 * y * y ) ); </span><span style="color:#323232;"> return y; </span><span style="color:#323232;">} </span>