diff options
Diffstat (limited to 'sysdeps/ieee754')
-rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c | 17 | ||||
-rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c | 70 |
2 files changed, 71 insertions, 16 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c index 8bb52524b7..483d4a0a4b 100644 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c @@ -69,23 +69,10 @@ strong_alias (__llround, __llroundl) weak_alias (__llround, llroundl) #endif -/* long has the same width as long long on LP64 machines, so use an alias. - If building for ILP32 on a machine with 64-bit registers, however, - use a cast if necessary. */ +/* long has the same width as long long on LP64 machines, so use an alias. */ #undef lround #undef __lround -#if !defined (_LP64) && REGISTER_CAST_INT32_TO_INT64 -long int -__lround (double x) -{ - return __llround (x); -} -weak_alias (__lround, lround) -# ifdef NO_LONG_DOUBLE -strong_alias (__lround, __lroundl) -weak_alias (__lround, lroundl) -# endif -#else +#ifdef _LP64 strong_alias (__llround, __lround) weak_alias (__llround, lround) # ifdef NO_LONG_DOUBLE diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c index 1e06fcb16e..390e733ffd 100644 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c @@ -1 +1,69 @@ -/* The code is the same as llround. Use an alias, see s_llround.c. */ +/* Round double value to long int. + Copyright (C) 1997-2015 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <math.h> + +#include <math_private.h> + +/* For LP64, lround is an alias for llround. */ +#ifndef _LP64 + +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 + +#endif |