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| author | Ulrich Drepper <drepper@redhat.com> | 2009-08-25 12:02:13 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-08-25 12:02:13 -0700 |
| commit | 8392ff2dc79dc321d79276f4de73056cd74320c8 (patch) | |
| tree | 3c00c8894fffb442a87c0796b624299642187df9 | |
| parent | 84088310ce06bfc5759b37f0cd043dce80f578b6 (diff) | |
| download | glibc-8392ff2dc79dc321d79276f4de73056cd74320c8.tar.gz glibc-8392ff2dc79dc321d79276f4de73056cd74320c8.tar.xz glibc-8392ff2dc79dc321d79276f4de73056cd74320c8.zip | |
64-bit optimized implementation of trunc.
| -rw-r--r-- | ChangeLog | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c | 56 |
2 files changed, 58 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 560f5db55c..0e1a955ffc 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,7 @@ 2009-08-25 Ulrich Drepper <drepper@redhat.com> + * sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c: New file. + * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Remove leftover YMM_SIZE definition. diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c new file mode 100644 index 0000000000..9add5ade71 --- /dev/null +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c @@ -0,0 +1,56 @@ +/* Truncate argument to nearest integral value not larger than the argument. + Copyright (C) 1997, 1998, 2009 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" + + +double +__trunc (double x) +{ + int64_t i0, j0; + int64_t sx; + + EXTRACT_WORDS64 (i0, x); + sx = i0 & UINT64_C(0x8000000000000000); + j0 = ((i0 >> 52) & 0x7ff) - 0x3ff; + if (j0 < 52) + { + if (j0 < 0) + /* The magnitude of the number is < 1 so the result is +-0. */ + INSERT_WORDS64 (x, sx); + else + INSERT_WORDS64 (x, sx | (i0 & ~(UINT64_C(0x000fffffffffffff) >> j0))); + } + else + { + if (j0 == 0x400) + /* x is inf or NaN. */ + return x + x; + } + + return x; +} +weak_alias (__trunc, trunc) +#ifdef NO_LONG_DOUBLE +strong_alias (__trunc, __truncl) +weak_alias (__trunc, truncl) +#endif |