diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c deleted file mode 100644 index 289804c840..0000000000 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c +++ /dev/null @@ -1,71 +0,0 @@ -/* Round to nearest integer value, rounding halfway cases to even. - dbl-64/wordsize-64 version. - Copyright (C) 2016-2021 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 - <https://www.gnu.org/licenses/>. */ - -#include <math.h> -#include <math_private.h> -#include <libm-alias-double.h> -#include <stdint.h> - -#define BIAS 0x3ff -#define MANT_DIG 53 -#define MAX_EXP (2 * BIAS + 1) - -double -__roundeven (double x) -{ - uint64_t ix, ux; - EXTRACT_WORDS64 (ix, x); - ux = ix & 0x7fffffffffffffffULL; - int exponent = ux >> (MANT_DIG - 1); - if (exponent >= BIAS + MANT_DIG - 1) - { - /* Integer, infinity or NaN. */ - if (exponent == MAX_EXP) - /* Infinity or NaN; quiet signaling NaNs. */ - return x + x; - else - return x; - } - else if (exponent >= BIAS) - { - /* At least 1; not necessarily an integer. Locate the bits with - exponents 0 and -1 (when the unbiased exponent is 0, the bit - with exponent 0 is implicit, but as the bias is odd it is OK - to take it from the low bit of the exponent). */ - int int_pos = (BIAS + MANT_DIG - 1) - exponent; - int half_pos = int_pos - 1; - uint64_t half_bit = 1ULL << half_pos; - uint64_t int_bit = 1ULL << int_pos; - if ((ix & (int_bit | (half_bit - 1))) != 0) - /* Carry into the exponent works correctly. No need to test - whether HALF_BIT is set. */ - ix += half_bit; - ix &= ~(int_bit - 1); - } - else if (exponent == BIAS - 1 && ux > 0x3fe0000000000000ULL) - /* Interval (0.5, 1). */ - ix = (ix & 0x8000000000000000ULL) | 0x3ff0000000000000ULL; - else - /* Rounds to 0. */ - ix &= 0x8000000000000000ULL; - INSERT_WORDS64 (x, ix); - return x; -} -hidden_def (__roundeven) -libm_alias_double (__roundeven, roundeven) |