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msvcrt: Import atan2 from musl.

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Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Piotr Caban 2020-08-06 16:59:25 +02:00 committed by Alexandre Julliard
parent 5eaa4c56b1
commit d9456a8cea
1 changed files with 67 additions and 4 deletions
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71
dlls/msvcrt/math.c
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@ -798,12 +798,75 @@ double CDECL MSVCRT_atan( double x )
/*********************************************************************
* MSVCRT_atan2 (MSVCRT.@)
*
* Copied from musl: src/math/atan2.c
*/
double CDECL MSVCRT_atan2( double x, double y )
double CDECL MSVCRT_atan2( double y, double x )
{
double ret = atan2(x, y);
if (isnan(x)) return math_error(_DOMAIN, "atan2", x, y, ret);
return ret;
static const double pi = 3.1415926535897931160E+00,
pi_lo = 1.2246467991473531772E-16;
double z;
unsigned int m, lx, ly, ix, iy;
if (isnan(x) || isnan(y))
return x+y;
ix = *(ULONGLONG*)&x >> 32;
lx = *(ULONGLONG*)&x;
iy = *(ULONGLONG*)&y >> 32;
ly = *(ULONGLONG*)&y;
if (((ix - 0x3ff00000) | lx) == 0) /* x = 1.0 */
return atan(y);
m = ((iy >> 31) & 1) | ((ix >> 30) & 2); /* 2*sign(x)+sign(y) */
ix = ix & 0x7fffffff;
iy = iy & 0x7fffffff;
/* when y = 0 */
if ((iy | ly) == 0) {
switch(m) {
case 0:
case 1: return y; /* atan(+-0,+anything)=+-0 */
case 2: return pi; /* atan(+0,-anything) = pi */
case 3: return -pi; /* atan(-0,-anything) =-pi */
}
}
/* when x = 0 */
if ((ix | lx) == 0)
return m & 1 ? -pi / 2 : pi / 2;
/* when x is INF */
if (ix == 0x7ff00000) {
if (iy == 0x7ff00000) {
switch(m) {
case 0: return pi / 4; /* atan(+INF,+INF) */
case 1: return -pi / 4; /* atan(-INF,+INF) */
case 2: return 3 * pi / 4; /* atan(+INF,-INF) */
case 3: return -3 * pi / 4; /* atan(-INF,-INF) */
}
} else {
switch(m) {
case 0: return 0.0; /* atan(+...,+INF) */
case 1: return -0.0; /* atan(-...,+INF) */
case 2: return pi; /* atan(+...,-INF) */
case 3: return -pi; /* atan(-...,-INF) */
}
}
}
/* |y/x| > 0x1p64 */
if (ix + (64 << 20) < iy || iy == 0x7ff00000)
return m & 1 ? -pi / 2 : pi / 2;
/* z = atan(|y/x|) without spurious underflow */
if ((m & 2) && iy + (64 << 20) < ix) /* |y/x| < 0x1p-64, x<0 */
z = 0;
else
z = atan(fabs(y / x));
switch (m) {
case 0: return z; /* atan(+,+) */
case 1: return -z; /* atan(-,+) */
case 2: return pi - (z - pi_lo); /* atan(+,-) */
default: /* case 3 */
return (z - pi_lo) - pi; /* atan(-,-) */
}
}
/*********************************************************************