* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunSoft, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*
*/
* See comments in atan2.c.
* Converted to long double by David Schultz <das@FreeBSD.ORG>.
*/
#include "libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double atan2l(long double y, long double x)
{
return atan2(y, x);
}
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
#include "__invtrigl.h"
long double atan2l(long double y, long double x)
{
union ldshape ux, uy;
long double z;
int m, ex, ey;
if (isnan(x) || isnan(y))
return x+y;
if (x == 1)
return atanl(y);
ux.f = x;
uy.f = y;
ex = ux.i.se & 0x7fff;
ey = uy.i.se & 0x7fff;
m = 2*(ux.i.se>>15) | uy.i.se>>15;
if (y == 0) {
switch(m) {
case 0:
case 1: return y;
case 2: return 2*pio2_hi;
case 3: return -2*pio2_hi;
}
}
if (x == 0)
return m&1 ? -pio2_hi : pio2_hi;
if (ex == 0x7fff) {
if (ey == 0x7fff) {
switch(m) {
case 0: return pio2_hi/2;
case 1: return -pio2_hi/2;
case 2: return 1.5*pio2_hi;
case 3: return -1.5*pio2_hi;
}
} else {
switch(m) {
case 0: return 0.0;
case 1: return -0.0;
case 2: return 2*pio2_hi;
case 3: return -2*pio2_hi;
}
}
}
if (ex+120 < ey || ey == 0x7fff)
return m&1 ? -pio2_hi : pio2_hi;
if ((m&2) && ey+120 < ex)
z = 0.0;
else
z = atanl(fabsl(y/x));
switch (m) {
case 0: return z;
case 1: return -z;
case 2: return 2*pio2_hi-(z-2*pio2_lo);
default:
return (z-2*pio2_lo)-2*pio2_hi;
}
}
#endif
