70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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/*
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* This file is part of the OpenMV project.
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* Copyright (c) 2013/2014 Ibrahim Abdelkader <i.abdalkader@gmail.com>
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* This work is licensed under the MIT license, see the file LICENSE for details.
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*
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* Fast approximate math functions.
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*
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*/
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#ifndef __FMATH_H
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#define __FMATH_H
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#include <stdint.h>
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#include <math.h>
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static inline float fast_sqrtf(float x)
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{
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//return sqrtf(x);
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asm("fsqrt.s %0, %1"
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: "=f"(x)
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: "f"(x));
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return x;
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}
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static inline int fast_floorf(float x)
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{
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return (int)(x);
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}
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static inline int fast_ceilf(float x)
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{
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return (int)(x + 0.9999f);
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}
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static inline int fast_roundf(float x)
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{
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return (int)(x);
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}
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static inline float fast_fabsf(float d)
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{
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return fabsf(d);
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}
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extern int fast_floorf(float x);
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extern int fast_ceilf(float x);
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extern int fast_roundf(float x);
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extern float fast_atanf(float x);
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extern float fast_atan2f(float y, float x);
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extern float fast_expf(float x);
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extern float fast_cbrtf(float d);
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extern float fast_fabsf(float d);
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extern float fast_log(float x);
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extern float fast_log2(float x);
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extern float fast_powf(float a, float b);
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/*#define fast_sqrtf(x) (sqrtf(x))
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#define fast_floorf(x) ((int)floorf(x))
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#define fast_ceilf(x) ((int)ceilf(x))
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#define fast_roundf(x) ((int)roundf(x))
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#define fast_atanf(x) (atanf(x))
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#define fast_atan2f(x,y) (atan2f((x),(y)))
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#define fast_expf(x) (expf(x))
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#define fast_cbrtf(x) (cbrtf(x))
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#define fast_fabsf(x) (fabsf(x))
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#define fast_log(x) (log(x))
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#define fast_log2(x) (log2(x))
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#define fast_powf(x,y) (powf((x),(y)))
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*/
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extern const float cos_table[360];
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extern const float sin_table[360];
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#endif // __FMATH_H
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