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https://github.com/ACreTeam/ac-decomp
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Prakxo
25 lines
569 B
C
25 lines
569 B
C
#ifndef W_MATH_H
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#define W_MATH_H
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#include "types.h"
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inline float sqrtf(float x)
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{
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static const double _half=.5;
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static const double _three=3.0;
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volatile float y;
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if(x > 0.0f)
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{
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double guess = __frsqrte((double)x); // returns an approximation to
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guess = _half*guess*(_three - guess*guess*x); // now have 12 sig bits
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guess = _half*guess*(_three - guess*guess*x); // now have 24 sig bits
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guess = _half*guess*(_three - guess*guess*x); // now have 32 sig bits
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y=(float)(x*guess);
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return y;
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}
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return x;
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}
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f64 atan2(f64, f64);
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f64 acos(f32);
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#endif |