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msvcrt: Import asinf from musl. 

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 16:59:14 +02:00 committed by Alexandre Julliard
parent 25cc6ff62d
commit d37e76a9a7
1 changed files with 43 additions and 4 deletions
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47
dlls/msvcrt/math.c
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@ -280,13 +280,52 @@ float CDECL MSVCRT_acosf( float x )
/*********************************************************************
* MSVCRT_asinf (MSVCRT.@)
*
* Copied from musl: src/math/asinf.c
*/
static float asinf_R(float z)
{
/* coefficients for R(x^2) */
static const float pS0 = 1.6666586697e-01,
pS1 = -4.2743422091e-02,
pS2 = -8.6563630030e-03,
qS1 = -7.0662963390e-01;
float_t p, q;
p = z * (pS0 + z * (pS1 + z * pS2));
q = 1.0f + z * qS1;
return p / q;
}
float CDECL MSVCRT_asinf( float x )
{
float ret = atan2f(x, sqrtf((1 - x) * (1 + x)));
if (x < -1.0 || x > 1.0 || !finitef(x))
return math_error(_DOMAIN, "asinf", x, 0, ret);
return ret;
static const double pio2 = 1.570796326794896558e+00;
double s;
float z;
unsigned int hx, ix;
hx = *(unsigned int*)&x;
ix = hx & 0x7fffffff;
if (ix >= 0x3f800000) { /* |x| >= 1 */
if (ix == 0x3f800000) /* |x| == 1 */
return x * pio2 + 7.5231638453e-37; /* asin(+-1) = +-pi/2 with inexact */
if (MSVCRT__isnanf(x)) return x;
return math_error(_DOMAIN, "asinf", x, 0, 0 / (x - x));
}
if (ix < 0x3f000000) { /* |x| < 0.5 */
/* if 0x1p-126 <= |x| < 0x1p-12, avoid raising underflow */
if (ix < 0x39800000 && ix >= 0x00800000)
return x;
return x + x * asinf_R(x * x);
}
/* 1 > |x| >= 0.5 */
z = (1 - fabsf(x)) * 0.5f;
s = sqrt(z);
x = pio2 - 2 * (s + s * asinf_R(z));
if (hx >> 31)
return -x;
return x;
}
/*********************************************************************