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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libquadmath/math/llroundq.c
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Diffstat (limited to 'libquadmath/math/llroundq.c')
-rw-r--r--libquadmath/math/llroundq.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/libquadmath/math/llroundq.c b/libquadmath/math/llroundq.c
new file mode 100644
index 000000000..c108e7ad1
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+++ b/libquadmath/math/llroundq.c
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+/* Round long double value to long long int.
+ Copyright (C) 1997, 1999, 2004 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 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 "quadmath-imp.h"
+
+
+long long int
+llroundq (__float128 x)
+{
+ int64_t j0;
+ uint64_t i1, i0;
+ long long int result;
+ int sign;
+
+ GET_FLT128_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 long int)) - 1)
+ {
+ if (j0 >= 112)
+ result = ((long long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
+ else
+ {
+ uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
+ if (j < i1)
+ ++i0;
+
+ if (j0 == 48)
+ result = (long long int) i0;
+ else
+ result = ((long long int) i0 << (j0 - 48)) | (j >> (112 - j0));
+ }
+ }
+ else
+ {
+ /* The number is too large. It is left implementation defined
+ what happens. */
+ return (long long int) x;
+ }
+
+ return sign * result;
+}