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57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
#include "pspmath.h"
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float vfpu_atanf(float x) {
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float result;
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// result = asinf(x/sqrt(x*x+1))
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__asm__ volatile (
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"mtv %1, S000\n"
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"vmul.s S001, S000, S000\n"
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"vadd.s S001, S001, S001[1]\n"
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"vrsq.s S001, S001\n"
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"vmul.s S000, S000, S001\n"
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"vasin.s S000, S000\n"
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"vcst.s S001, VFPU_PI_2\n"
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"vmul.s S000, S000, S001\n"
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"mfv %0, S000\n"
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: "=r"(result) : "r"(x));
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return result;
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}
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#define PI 3.14159265358979f
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#define PI_2 1.57079632679489f
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inline static float fabsf(float x) {
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float r;
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__asm__ volatile( "abs.s %0, %1" : "=f"(r) :"f"(x):"memory");
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return r;
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}
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/* double a;
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if (fabs(x) >= fabs(y)) {
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a = atan(y/x) ;
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if (x < 0.0) {
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if (y >= 0.0) a += _pi ;
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else a -= _pi ;
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}
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}
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else {
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a = -atan(x/y) ;
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if (y < 0.0) a -= _halfpi ;
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else a += _halfpi ;
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}
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return a ;*/
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float vfpu_atan2f(float y, float x) {
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float r;
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if (fabsf(x) >= fabsf(y)) {
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r = vfpu_atanf(y/x);
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if (x < 0.0f) r += (y>=0.0f ? PI : -PI);
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} else {
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r = -vfpu_atanf(x/y);
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r += (y < 0.0f ? -PI_2 : PI_2);
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}
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return r;
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}
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