Module: wine
Branch: master
Commit: bfc23bbd5fd169c73da57305c1453ab02368c0a5
URL: https://source.winehq.org/git/wine.git/?a=commit;h=bfc23bbd5fd169c73da57305…
Author: Piotr Caban <piotr(a)codeweavers.com>
Date: Tue Aug 4 15:17:04 2020 +0200
msvcrt: Import sqrtf from musl.
Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>
---
dlls/msvcrt/math.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 77 insertions(+), 3 deletions(-)
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index f3cf633f25..bbb5a9194e 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -16,7 +16,19 @@
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ *
+ * For functions copied from musl (http://www.musl-libc.org/):
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
*/
+
#include "config.h"
#include "wine/port.h"
@@ -351,12 +363,74 @@ float CDECL MSVCRT_sinhf( float x )
/*********************************************************************
* MSVCRT_sqrtf (MSVCRT.@)
+ *
+ * Copied from musl: src/math/sqrtf.c
*/
float CDECL MSVCRT_sqrtf( float x )
{
- float ret = sqrtf(x);
- if (x < 0.0) return math_error(_DOMAIN, "sqrtf", x, 0, ret);
- return ret;
+ static const float tiny = 1.0e-30;
+
+ float z;
+ int sign = 0x80000000;
+ int ix,s,q,m,t,i;
+ unsigned int r;
+
+ ix = *(int*)&x;
+
+ /* take care of Inf and NaN */
+ if ((ix & 0x7f800000) == 0x7f800000 && (ix == 0x7f800000 || ix & 0x7fffff))
+ return x;
+
+ /* take care of zero */
+ if (ix <= 0) {
+ if ((ix & ~sign) == 0)
+ return x; /* sqrt(+-0) = +-0 */
+ return math_error(_DOMAIN, "sqrtf", x, 0, (x - x) / (x - x)); /* sqrt(-ve) = sNaN */
+ }
+ /* normalize x */
+ m = ix >> 23;
+ if (m == 0) { /* subnormal x */
+ for (i = 0; (ix & 0x00800000) == 0; i++)
+ ix <<= 1;
+ m -= i - 1;
+ }
+ m -= 127; /* unbias exponent */
+ ix = (ix & 0x007fffff) | 0x00800000;
+ if (m & 1) /* odd m, double x to make it even */
+ ix += ix;
+ m >>= 1; /* m = [m/2] */
+
+ /* generate sqrt(x) bit by bit */
+ ix += ix;
+ q = s = 0; /* q = sqrt(x) */
+ r = 0x01000000; /* r = moving bit from right to left */
+
+ while (r != 0) {
+ t = s + r;
+ if (t <= ix) {
+ s = t + r;
+ ix -= t;
+ q += r;
+ }
+ ix += ix;
+ r >>= 1;
+ }
+
+ /* use floating add to find out rounding direction */
+ if (ix != 0) {
+ z = 1.0f - tiny; /* raise inexact flag */
+ if (z >= 1.0f) {
+ z = 1.0f + tiny;
+ if (z > 1.0f)
+ q += 2;
+ else
+ q += q & 1;
+ }
+ }
+ ix = (q >> 1) + 0x3f000000;
+ r = ix + ((unsigned int)m << 23);
+ z = *(float*)&r;
+ return z;
}
/*********************************************************************