diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/flt-32/s_lrintf.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/flt-32/s_lrintf.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/flt-32/s_lrintf.c b/REORG.TODO/sysdeps/ieee754/flt-32/s_lrintf.c new file mode 100644 index 0000000000..a1ed720c0f --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/flt-32/s_lrintf.c @@ -0,0 +1,86 @@ +/* Round argument to nearest integral value according to current rounding + direction. + Copyright (C) 1997-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <fenv.h> +#include <limits.h> +#include <math.h> + +#include <math_private.h> +#include <fix-fp-int-convert-overflow.h> + +static const float two23[2] = +{ + 8.3886080000e+06, /* 0x4B000000 */ + -8.3886080000e+06, /* 0xCB000000 */ +}; + + +long int +__lrintf (float x) +{ + int32_t j0; + u_int32_t i0; + float w; + float t; + long int result; + int sx; + + GET_FLOAT_WORD (i0, x); + + sx = i0 >> 31; + j0 = ((i0 >> 23) & 0xff) - 0x7f; + i0 &= 0x7fffff; + i0 |= 0x800000; + + if (j0 < (int32_t) (sizeof (long int) * 8) - 1) + { + if (j0 >= 23) + result = (long int) i0 << (j0 - 23); + else + { + w = math_narrow_eval (two23[sx] + x); + t = w - two23[sx]; + GET_FLOAT_WORD (i0, t); + j0 = ((i0 >> 23) & 0xff) - 0x7f; + i0 &= 0x7fffff; + i0 |= 0x800000; + + result = (j0 < 0 ? 0 : i0 >> (23 - j0)); + } + } + else + { +#ifdef FE_INVALID + /* The number is too large. Unless it rounds to LONG_MIN, + FE_INVALID must be raised and the return value is + unspecified. */ + if (FIX_FLT_LONG_CONVERT_OVERFLOW && x != (float) LONG_MIN) + { + feraiseexcept (FE_INVALID); + return sx == 0 ? LONG_MAX : LONG_MIN; + } +#endif + return (long int) x; + } + + return sx ? -result : result; +} + +weak_alias (__lrintf, lrintf) |