43 lines
No EOL
1 KiB
C
43 lines
No EOL
1 KiB
C
#ifndef _MATH_H
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#define _MATH_H
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extern 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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double atan(double x);
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double copysign(double x, double y);
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double cos(double x);
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double floor(double x);
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double frexp(double x, int *exp);
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double ldexp(double x, int exp);
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double modf(double x, double *intpart);
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double sin(double x);
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double tan(double x);
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double acos(double x);
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double asin(double x);
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double atan2(double y, double x);
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double fmod(double x, double y);
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double log(double x);
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float tanf(float x);
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float sinf(float x);
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float cosf(float x);
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float atan2f(float y, float x);
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float acosf(float x);
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#define abs(x) __abs(x)
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#endif |