Create a branch for Aleksandar Andrejevic for his work on NTVDM. See http://jira.reactos.org/browse/CORE-7250 for more details.

svn path=/branches/ntvdm/; revision=59241

lib/sdk/crt/math/i386/ldexp.c

@@ -0,0 +1,65 @@
+/* Math functions for i387.
+   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by John C. Bowman <bowman@ipp-garching.mpg.de>, 1995.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#include <precomp.h>
+#include <math.h>
+#include <float.h>
+
+double ldexp (double value, int exp)
+{
+    register double result;
+#ifndef __GNUC__
+    register double __dy = (double)exp;
+#endif
+
+    /* Check for value correctness
+     * and set errno if required
+     */
+    if (_isnan(value))
+    {
+        errno = EDOM;
+    }
+
+#ifdef __GNUC__
+#if defined(__clang__)
+    asm ("fild %[exp]\n"
+         "fscale\n"
+         "fstp %%st(1)\n"
+         : [result] "=t" (result)
+         : [value] "0" (value), [exp] "m" (exp));
+#else
+    asm ("fscale"
+         : "=t" (result)
+         : "0" (value), "u" ((double)exp)
+         : "1");
+#endif
+#else /* !__GNUC__ */
+    __asm
+    {
+        fld __dy
+        fld value
+        fscale
+        fstp result
+    }
+#endif /* !__GNUC__ */
+    return result;
+}
+