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| author | Ulrich Drepper <drepper@redhat.com> | 2009-08-25 14:12:41 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-08-25 14:12:41 -0700 |
| commit | d5cb714bb8c5fb116ac73c46890026c8beea92fe (patch) | |
| tree | babed9a2cc1f38158cb7ceb88ba2a59a91102dbb | |
| parent | 625c963390b4186ba6b766a03756b16dfa792d49 (diff) | |
| download | glibc-d5cb714bb8c5fb116ac73c46890026c8beea92fe.tar.gz glibc-d5cb714bb8c5fb116ac73c46890026c8beea92fe.tar.xz glibc-d5cb714bb8c5fb116ac73c46890026c8beea92fe.zip | |
Add 64-bit optimized version lround.
| -rw-r--r-- | ChangeLog | 1 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c | 67 |
2 files changed, 68 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 0e1a955ffc..242b5bb83e 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,6 @@ 2009-08-25 Ulrich Drepper <drepper@redhat.com> + * sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c: New file. * sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c: New file. * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Remove diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c new file mode 100644 index 0000000000..2df169eada --- /dev/null +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c @@ -0,0 +1,67 @@ +/* Round double value to long int. + Copyright (C) 1997, 2004, 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" + + +long int +__lround (double x) +{ + int32_t j0; + int64_t i0; + long int result; + int sign; + + EXTRACT_WORDS64 (i0, x); + j0 = ((i0 >> 52) & 0x7ff) - 0x3ff; + sign = i0 < 0 ? -1 : 1; + i0 &= UINT64_C(0xfffffffffffff); + i0 |= UINT64_C(0x10000000000000); + + if (j0 < (int32_t) (8 * sizeof (long int)) - 1) + { + if (j0 < 0) + return j0 < -1 ? 0 : sign; + else if (j0 >= 52) + result = i0 << (j0 - 52); + else + { + i0 += UINT64_C(0x8000000000000) >> j0; + + result = i0 >> (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 |