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msvcrt: Improve asinf compatibility with native ucrtbase. 

It reduces number of different asinf results from 5413834 to 639464.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Piotr Caban 2021-02-24 16:32:07 +01:00 committed by Alexandre Julliard
parent eca796bf75
commit 0b8db61271
1 changed files with 15 additions and 10 deletions
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25
dlls/msvcrt/math.c
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@ -356,23 +356,25 @@ float CDECL acosf( float x )
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;
static const float p1 = 1.66666672e-01,
p2 = -5.11644611e-02,
p3 = -1.21124933e-02,
p4 = -3.58742251e-03,
q1 = -7.56982703e-01;
float p, q;
p = z * (pS0 + z * (pS1 + z * pS2));
q = 1.0f + z * qS1;
p = z * (p1 + z * (p2 + z * (p3 + z * p4)));
q = 1.0f + z * q1;
return p / q;
}
float CDECL asinf( float x )
{
static const double pio2 = 1.570796326794896558e+00;
static const float pio4_hi = 0.785398125648;
static const float pio2_lo = 7.54978941586e-08;
double s;
float z;
float s, z, f, c;
unsigned int hx, ix;
hx = *(unsigned int*)&x;
@ -391,8 +393,11 @@ float CDECL asinf( float x )
}
/* 1 > |x| >= 0.5 */
z = (1 - fabsf(x)) * 0.5f;
s = sqrt(z);
x = pio2 - 2 * (s + s * asinf_R(z));
s = sqrtf(z);
/* f+c = sqrt(z) */
*(unsigned int*)&f = *(unsigned int*)&s & 0xffff0000;
c = (z - f * f) / (s + f);
x = pio4_hi - (2 * s * asinf_R(z) - (pio2_lo - 2 * c) - (pio4_hi - 2 * f));
if (hx >> 31)
return -x;
return x;