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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/truncq.c
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Diffstat (limited to 'libquadmath/math/truncq.c')
-rw-r--r--libquadmath/math/truncq.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/libquadmath/math/truncq.c b/libquadmath/math/truncq.c
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+++ b/libquadmath/math/truncq.c
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+/* Truncate argument to nearest integral value not larger than the argument.
+ 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 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"
+
+
+__float128
+truncq (__float128 x)
+{
+ int32_t j0;
+ uint64_t i0, i1, sx;
+
+ GET_FLT128_WORDS64 (i0, i1, x);
+ sx = i0 & 0x8000000000000000ULL;
+ j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
+ if (j0 < 48)
+ {
+ if (j0 < 0)
+ /* The magnitude of the number is < 1 so the result is +-0. */
+ SET_FLT128_WORDS64 (x, sx, 0);
+ else
+ SET_FLT128_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
+ }
+ else if (j0 > 111)
+ {
+ if (j0 == 0x4000)
+ /* x is inf or NaN. */
+ return x + x;
+ }
+ else
+ {
+ SET_FLT128_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
+ }
+
+ return x;
+}