Imported lround() and lroundf() from glibc.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17399 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/posix/glibc/arch/generic/s_lround.c

@@ -0,0 +1,81 @@
+/* Round double value to long int.
+   Copyright (C) 1997, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   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., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <math.h>
+
+#include "math_private.h"
+
+
+long int
+__lround (double x)
+{
+  int32_t j0;
+  u_int32_t i1, i0;
+  long int result;
+  int sign;
+
+  EXTRACT_WORDS (i0, i1, x);
+  j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
+  sign = (i0 & 0x80000000) != 0 ? -1 : 1;
+  i0 &= 0xfffff;
+  i0 |= 0x100000;
+
+  if (j0 < 20)
+    {
+      if (j0 < 0)
+	return j0 < -1 ? 0 : sign;
+      else
+	{
+	  i0 += 0x80000 >> j0;
+
+	  result = i0 >> (20 - j0);
+	}
+    }
+  else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
+    {
+      if (j0 >= 52)
+	result = ((long int) i0 << (j0 - 20)) | (i1 << (j0 - 52));
+      else
+	{
+	  u_int32_t j = i1 + (0x80000000 >> (j0 - 20));
+	  if (j < i1)
+	    ++i0;
+
+	  if (j0 == 20)
+	    result = (long int) i0;
+	  else
+	    result = ((long int) i0 << (j0 - 20)) | (j >> (52 - j0));
+	}
+    }
+  else
+    {
+      /* The number is too large.  It is left implementation defined
+	 what happens.  */
+      return (long int) x;
+    }
+
+  return sign * result;
+}
+
+weak_alias (__lround, lround)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__lround, __lroundl)
+weak_alias (__lround, lroundl)
+#endif

src/system/libroot/posix/glibc/arch/generic/s_lroundf.c

@@ -0,0 +1,63 @@
+/* Round float value to long int.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   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., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <math.h>
+
+#include "math_private.h"
+
+
+long int
+__lroundf (float x)
+{
+  int32_t j0;
+  u_int32_t i;
+  long int result;
+  int sign;
+
+  GET_FLOAT_WORD (i, x);
+  j0 = ((i >> 23) & 0xff) - 0x7f;
+  sign = (i & 0x80000000) != 0 ? -1 : 1;
+  i &= 0x7fffff;
+  i |= 0x800000;
+
+  if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
+    {
+      if (j0 < 0)
+	return j0 < -1 ? 0 : sign;
+      else if (j0 >= 23)
+	result = (long int) i << (j0 - 23);
+      else
+	{
+	  i += 0x400000 >> j0;
+
+	  result = i >> (23 - j0);
+	}
+    }
+  else
+    {
+      /* The number is too large.  It is left implementation defined
+	 what happens.  */
+      return (long int) x;
+    }
+
+  return sign * result;
+}
+
+weak_alias (__lroundf, lroundf)

src/system/libroot/posix/glibc/arch/ppc/Jamfile

@@ -75,6 +75,7 @@ local genericSources =
 	s_ldexp.c s_ldexpf.c # s_ldexpl.c
 	s_log1p.c s_log1pf.c
 	s_logb.c s_logbf.c # s_logbl.c
+	s_lround.c s_lroundf.c
 	s_modf.c s_modff.c # s_modfl.c
 	s_nan.c s_nanf.c # s_nanl.c
 	s_round.c s_roundf.c # s_roundl.c

src/system/libroot/posix/glibc/arch/x86/Jamfile

@@ -55,6 +55,7 @@ local genericSources =
 	s_isinf.c s_isinff.c
 	s_isnan.c s_isnanf.c
 	s_ldexp.c s_ldexpf.c #s_ldexpl.c
+	s_lround.c s_lroundf.c
 	s_modf.c s_modff.c # s_modfl.c
 	s_nan.c s_nanf.c
 	s_nextafter.c