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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/ieee754/ldbl-128/s_lroundl.c
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
downloadglibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.tar.gz
Update.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_lroundl.c')
-rw-r--r--sysdeps/ieee754/ldbl-128/s_lroundl.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_lroundl.c b/sysdeps/ieee754/ldbl-128/s_lroundl.c
new file mode 100644
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+++ b/sysdeps/ieee754/ldbl-128/s_lroundl.c
@@ -0,0 +1,74 @@
+/* Round long double value to long int.
+ Copyright (C) 1997, 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
+ Jakub Jelinek <jj@ultra.linux.cz>, 1999.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. 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
+__lroundl (long double x)
+{
+ int64_t j0;
+ u_int64_t i1, i0;
+ long int result;
+ int sign;
+
+ GET_LDOUBLE_WORDS64 (i0, i1, x);
+ j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
+ sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;
+ i0 &= 0x0000ffffffffffffLL;
+ i0 |= 0x0001000000000000LL;
+
+ if (j0 < 48)
+ {
+ if (j0 < 0)
+ return j0 < -1 ? 0 : sign;
+ else
+ {
+ i0 += 0x0000800000000000LL >> j0;
+ result = i0 >> (48 - j0);
+ }
+ }
+ else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
+ {
+ if (j0 >= 112)
+ result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
+ else
+ {
+ u_int64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
+ if (j < i1)
+ ++i0;
+
+ result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0));
+ }
+ }
+ else
+ {
+ /* The number is too large. It is left implementation defined
+ what happens. */
+ return (long int) x;
+ }
+
+ return sign * result;
+}
+
+weak_alias (__lroundl, lroundl)