Yuu Kobayashi / AOTTrigon

AOT計算で呼び出し自体を早くする三角関数

Dependents:   NuMidi401 NuFM401

AOTTrigon.h@10:5bccb4bc4f33, 2014-12-29 (annotated)

Committer:
kb10uy
Date:
Mon Dec 29 08:58:51 2014 +0000
Revision:
10:5bccb4bc4f33
Parent:
9:d6153f6a5f75
Child:
11:19594eeb6f2b
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
kb10uy 0:2888f1d9a23e 1 #pragma once
kb10uy 0:2888f1d9a23e 2 #include "math.h"
kb10uy 10:5bccb4bc4f33 3 #include "mbed.h"
kb10uy 0:2888f1d9a23e 4
kb10uy 0:2888f1d9a23e 5 /** AOTTrigon class
kb10uy 0:2888f1d9a23e 6 * AOT計算によって三角関数の計算を高速化します。
kb10uy 0:2888f1d9a23e 7 */
kb10uy 0:2888f1d9a23e 8 class AOTTrigon
kb10uy 0:2888f1d9a23e 9 {
kb10uy 0:2888f1d9a23e 10 public:
kb10uy 4:c15b45812c25 11 AOTTrigon();
kb10uy 0:2888f1d9a23e 12
kb10uy 10:5bccb4bc4f33 13 inline double sin(double);
kb10uy 10:5bccb4bc4f33 14 inline double cos(double);
kb10uy 10:5bccb4bc4f33 15 inline double tan(double);
kb10uy 0:2888f1d9a23e 16
kb10uy 0:2888f1d9a23e 17 private:
kb10uy 10:5bccb4bc4f33 18 double *t_sin;
kb10uy 10:5bccb4bc4f33 19 double rate;
kb10uy 9:d6153f6a5f75 20 const double pi;
kb10uy 1:f1e55d228f6a 21 };
kb10uy 3:ba78a1dd8b55 22
kb10uy 10:5bccb4bc4f33 23 inline double AOTTrigon::sin(double x)
kb10uy 3:ba78a1dd8b55 24 {
kb10uy 4:c15b45812c25 25 return t_sin[((int)(x * rate)) & 0xFF];
kb10uy 3:ba78a1dd8b55 26 }
kb10uy 8:b771ac4871bb 27
kb10uy 10:5bccb4bc4f33 28 inline double AOTTrigon::cos(double x)
kb10uy 3:ba78a1dd8b55 29 {
kb10uy 7:eed80268ab34 30 return sin(x + pi / 2.0f);
kb10uy 3:ba78a1dd8b55 31 }
kb10uy 8:b771ac4871bb 32
kb10uy 10:5bccb4bc4f33 33 inline double AOTTrigon::tan(double x)
kb10uy 3:ba78a1dd8b55 34 {
kb10uy 3:ba78a1dd8b55 35 return sin(x) / cos(x);
kb10uy 3:ba78a1dd8b55 36 }