| /* Round argument to nearest integral value according to current rounding |
| direction. |
| Copyright (C) 1997 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 Library General Public License as |
| published by the Free Software Foundation; either version 2 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 |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. 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" |
| |
| #ifdef NO_LONG_DOUBLE |
| /* The `long double' is in fact the IEEE `double' type. */ |
| static long double two52[2] = |
| { |
| 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ |
| -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ |
| }; |
| |
| |
| long int |
| __lrint (long double x) |
| { |
| int32_t j0,sx; |
| u_int32_t i0,i1,i; |
| long double t, w; |
| long int result; |
| |
| EXTRACT_WORDS (i0, i1, x); |
| |
| sx = i0 >> 31; |
| j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; |
| |
| if (j0 < 20) |
| { |
| if (j0 < 0) |
| { |
| if (((i0 & 0x7fffffff) | i1) == 0) |
| /* The number is 0. */ |
| result = 0; |
| else |
| { |
| i1 |= i0; |
| i0 &= 0xfffe0000; |
| i0 |= ((i1 | -i1) >> 12) & 0x80000; |
| SET_HIGH_WORD (x, i0); |
| w = two52[sx] + x; |
| t = w - two52[sx]; |
| GET_HIGH_WORD (i0, t); |
| if ((i0 & 0x7fffffff) >= 0x3fff0000) |
| result = sx ? -1 : 1; |
| else |
| result = 0; |
| } |
| } |
| else |
| { |
| u_int32_t i = 0x000fffff >> j0; |
| if (((i0 & i) | i1) == 0) |
| { |
| /* X is not integral. */ |
| i >>= 1; |
| if (((i0 & i) | i1) != 0) |
| { |
| if (j0 == 19) |
| i1 = 0x40000000; |
| else |
| i0 = (i0 & (~i)) | (0x20000 >> j0); |
| |
| INSERT_WORDS (x, i0, i1); |
| w = two52[sx] + x; |
| x = w - two52[sx]; |
| EXTRACT_WORDS (i0, i1, x); |
| |
| j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; |
| } |
| } |
| |
| result = ((i0 >> (20 - j0)) & 0xfffff) | (0x00100000 >> (20 - j0)); |
| if (sx) |
| result = -result; |
| } |
| } |
| else if ((unsigned int) j0 < sizeof (long int) * 8 && j0 < 53) |
| { |
| i = ((u_int32_t) (0xffffffff)) >> (j0 - 20); |
| if ((i1 & i) != 0) |
| { |
| /* x is not integral. */ |
| i >>= 1; |
| if ((i1 & i) != 0) |
| i1 = (i1 & (~i)) | (0x40000000 >> (j0 - 20)); |
| } |
| |
| INSERT_WORDS (x, i0, i1); |
| w = two52[sx] + x; |
| x = w - two52[sx]; |
| EXTRACT_WORDS (i0, i1, x); |
| |
| j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; |
| |
| result = i0 | 0x00100000; |
| if (j0 > 20) |
| { |
| result <<= j0 - 20; |
| result |= i1 >> (52 - j0); |
| } |
| if (sx) |
| result = -result; |
| } |
| else |
| /* Too large. The number is either +-inf or NaN or it is too |
| large to be effected by rounding. The standard leaves it |
| undefined what to return when the number is too large to fit in |
| a `long int'. */ |
| result = (long int) x; |
| |
| return result; |
| } |
| |
| #else |
| static long double two63[2] = |
| { |
| 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */ |
| -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */ |
| }; |
| |
| |
| long int |
| __lrint (long double x) |
| { |
| int32_t se,j0,sx; |
| u_int32_t i0,i1,i; |
| long int result; |
| long double w, t; |
| |
| GET_LDOUBLE_WORDS (se, i0, i1, x); |
| |
| sx = (se >> 15) & 1; |
| j0 = (se & 0x7fff) - 0x3fff; |
| |
| if (j0 < 31) |
| { |
| if (j0 < 0) |
| { |
| if (((se & 0x7fff) | i0 | i1) == 0) |
| /* The number is 0. */ |
| result = 0; |
| else |
| { |
| i1 |= i0; |
| i0 &= 0xe0000000; |
| i0 |= (i1 | -i1) & 0x80000000; |
| SET_LDOUBLE_MSW (x, i0); |
| w = two63[sx] + x; |
| t = w - two63[sx]; |
| GET_LDOUBLE_EXP (i0, t); |
| if ((i0 & 0x7fff) >= 0x3fff) |
| result = sx ? -1 : 1; |
| else |
| result = 0; |
| } |
| } |
| else |
| { |
| u_int32_t i = 0x7fffffff >> j0; |
| if (((i0 & i) | i1) == 0) |
| { |
| /* X is not integral. */ |
| i >>= 1; |
| if (((i0 & i) | i1) != 0) |
| { |
| if (j0 == 31) |
| i1 = 0x40000000; |
| else |
| i0 = (i0 & (~i)) | (0x20000000 >> j0); |
| |
| SET_LDOUBLE_WORDS (x, se, i0, i1); |
| w = two63[sx] + x; |
| x = w - two63[sx]; |
| GET_LDOUBLE_WORDS (se, i0, i1, x); |
| |
| sx = (se >> 15) & 1; |
| j0 = (se & 0x7fff) - 0x3fff; |
| } |
| } |
| |
| |
| result = i0 >> (31 - j0); |
| } |
| } |
| else if ((unsigned int) j0 < sizeof (long int) * 8 && j0 < 64) |
| { |
| i = ((u_int32_t) (0xffffffff)) >> (j0 - 31); |
| if ((i1 & i) != 0) |
| { |
| /* x is not integral. */ |
| i >>= 1; |
| if ((i1 & i) != 0) |
| i1 = (i1 & (~i)) | (0x40000000 >> (j0 - 31)); |
| } |
| |
| SET_LDOUBLE_WORDS (x, se, i0, i1); |
| w = two63[sx] + x; |
| x = w - two63[sx]; |
| GET_LDOUBLE_WORDS (se, i0, i1, x); |
| |
| j0 = (se & 0x7fff) - 0x3fff; |
| |
| result = i0; |
| if (j0 > 31) |
| { |
| result <<= j0 - 31; |
| result |= i1 >> (63 - j0); |
| } |
| } |
| else |
| /* Too large. The number is either +-inf or NaN or it is too |
| large to be effected by rounding. The standard leaves it |
| undefined what to return when the number is too large to fit in |
| a `long int'. */ |
| result = (long int) x; |
| |
| return result; |
| } |
| #endif |
| |
| weak_alias (__lrint, lrint) |