| /* Round argument to nearest integral value according to current rounding |
| direction. |
| Copyright (C) 1997-2018 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 <libm-alias-float.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; |
| uint32_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; |
| } |
| |
| libm_alias_float (__lrint, lrint) |
