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msvcrt: Import erfcf implementation 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 2021-05-19 15:26:23 +02:00 committed by Alexandre Julliard
parent b48e80a520
commit de11fe6dcd
6 changed files with 124 additions and 20 deletions
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1
configure vendored
View File

@ -19624,7 +19624,6 @@ for ac_func in \
atanhf \
erf \
erfc \
erfcf \
erff \
exp2 \
exp2f \

1
configure.ac
View File

@ -2664,7 +2664,6 @@ AC_CHECK_FUNCS(\
atanhf \
erf \
erfc \
erfcf \
erff \
exp2 \
exp2f \

125
dlls/msvcrt/math.c
View File

@ -5223,6 +5223,87 @@ double CDECL erf(double x)
return unix_funcs->erf( x );
}
static float erfc1f(float x)
{
static const float erx = 8.4506291151e-01,
pa0 = -2.3621185683e-03,
pa1 = 4.1485610604e-01,
pa2 = -3.7220788002e-01,
pa3 = 3.1834661961e-01,
pa4 = -1.1089469492e-01,
pa5 = 3.5478305072e-02,
pa6 = -2.1663755178e-03,
qa1 = 1.0642088205e-01,
qa2 = 5.4039794207e-01,
qa3 = 7.1828655899e-02,
qa4 = 1.2617121637e-01,
qa5 = 1.3637083583e-02,
qa6 = 1.1984500103e-02;
float s, P, Q;
s = fabsf(x) - 1;
P = pa0 + s * (pa1 + s * (pa2 + s * (pa3 + s * (pa4 + s * (pa5 + s * pa6)))));
Q = 1 + s * (qa1 + s * (qa2 + s * (qa3 + s * (qa4 + s * (qa5 + s * qa6)))));
return 1 - erx - P / Q;
}
static float erfc2f(UINT32 ix, float x)
{
static const float ra0 = -9.8649440333e-03,
ra1 = -6.9385856390e-01,
ra2 = -1.0558626175e+01,
ra3 = -6.2375331879e+01,
ra4 = -1.6239666748e+02,
ra5 = -1.8460508728e+02,
ra6 = -8.1287437439e+01,
ra7 = -9.8143291473e+00,
sa1 = 1.9651271820e+01,
sa2 = 1.3765776062e+02,
sa3 = 4.3456588745e+02,
sa4 = 6.4538726807e+02,
sa5 = 4.2900814819e+02,
sa6 = 1.0863500214e+02,
sa7 = 6.5702495575e+00,
sa8 = -6.0424413532e-02,
rb0 = -9.8649431020e-03,
rb1 = -7.9928326607e-01,
rb2 = -1.7757955551e+01,
rb3 = -1.6063638306e+02,
rb4 = -6.3756646729e+02,
rb5 = -1.0250950928e+03,
rb6 = -4.8351919556e+02,
sb1 = 3.0338060379e+01,
sb2 = 3.2579251099e+02,
sb3 = 1.5367296143e+03,
sb4 = 3.1998581543e+03,
sb5 = 2.5530502930e+03,
sb6 = 4.7452853394e+02,
sb7 = -2.2440952301e+01;
float s, R, S, z;
if (ix < 0x3fa00000) /* |x| < 1.25 */
return erfc1f(x);
x = fabsf(x);
s = 1 / (x * x);
if (ix < 0x4036db6d) { /* |x| < 1/0.35 */
R = ra0 + s * (ra1 + s * (ra2 + s * (ra3 + s * (ra4 + s *
(ra5 + s * (ra6 + s * ra7))))));
S = 1.0f + s * (sa1 + s * (sa2 + s * (sa3 + s * (sa4 + s *
(sa5 + s * (sa6 + s * (sa7 + s * sa8)))))));
} else { /* |x| >= 1/0.35 */
R = rb0 + s * (rb1 + s * (rb2 + s * (rb3 + s * (rb4 + s * (rb5 + s * rb6)))));
S = 1.0f + s * (sb1 + s * (sb2 + s * (sb3 + s * (sb4 + s *
(sb5 + s * (sb6 + s * sb7))))));
}
ix = *(UINT32*)&x & 0xffffe000;
z = *(float*)&ix;
return expf(-z * z - 0.5625f) * expf((z - x) * (z + x) + R / S) / x;
}
/*********************************************************************
* erff (MSVCR120.@)
*/
@ -5241,10 +5322,52 @@ double CDECL erfc(double x)
/*********************************************************************
* erfcf (MSVCR120.@)
*
* Copied from musl: src/math/erff.c
*/
float CDECL erfcf(float x)
{
return unix_funcs->erfcf( x );
static const float pp0 = 1.2837916613e-01,
pp1 = -3.2504209876e-01,
pp2 = -2.8481749818e-02,
pp3 = -5.7702702470e-03,
pp4 = -2.3763017452e-05,
qq1 = 3.9791721106e-01,
qq2 = 6.5022252500e-02,
qq3 = 5.0813062117e-03,
qq4 = 1.3249473704e-04,
qq5 = -3.9602282413e-06;
float r, s, z, y;
UINT32 ix;
int sign;
ix = *(UINT32*)&x;
sign = ix >> 31;
ix &= 0x7fffffff;
if (ix >= 0x7f800000) {
/* erfc(nan)=nan, erfc(+-inf)=0,2 */
return 2 * sign + 1 / x;
}
if (ix < 0x3f580000) { /* |x| < 0.84375 */
if (ix < 0x23800000) /* |x| < 2**-56 */
return 1.0f - x;
z = x * x;
r = pp0 + z * (pp1 + z * (pp2 + z * (pp3 + z * pp4)));
s = 1.0f + z * (qq1 + z * (qq2 + z * (qq3 + z * (qq4 + z * qq5))));
y = r / s;
if (sign || ix < 0x3e800000) /* x < 1/4 */
return 1.0f - (x + x * y);
return 0.5f - (x - 0.5f + x * y);
}
if (ix < 0x41e00000) { /* |x| < 28 */
return sign ? 2 - erfc2f(ix, x) : erfc2f(ix, x);
}
if (sign)
return 2 - FLT_MIN;
*_errno() = ERANGE;
return FLT_MIN * FLT_MIN;
}
/*********************************************************************

13
dlls/msvcrt/unixlib.c
View File

@ -197,18 +197,6 @@ static double CDECL unix_erfc(double x)
#endif
}
/*********************************************************************
* erfcf
*/
static float CDECL unix_erfcf(float x)
{
#ifdef HAVE_ERFCF
return erfcf(x);
#else
return unix_erfc(x);
#endif
}
/*********************************************************************
* exp
*/
@ -579,7 +567,6 @@ static const struct unix_funcs funcs =
unix_coshf,
unix_erf,
unix_erfc,
unix_erfcf,
unix_erff,
unix_exp,
unix_expf,

1
dlls/msvcrt/unixlib.h
View File

@ -35,7 +35,6 @@ struct unix_funcs
float (CDECL *coshf)(float x);
double (CDECL *erf)(double x);
double (CDECL *erfc)(double x);
float (CDECL *erfcf)(float x);
float (CDECL *erff)(float x);
double (CDECL *exp)(double x);
float (CDECL *expf)(float x);

3
include/config.h.in
View File

@ -116,9 +116,6 @@
/* Define to 1 if you have the `erfc' function. */
#undef HAVE_ERFC
/* Define to 1 if you have the `erfcf' function. */
#undef HAVE_ERFCF
/* Define to 1 if you have the `erff' function. */
#undef HAVE_ERFF