diff options
Diffstat (limited to 'sysdeps/ieee754/flt-32/s_roundevenf.c')
-rw-r--r-- | sysdeps/ieee754/flt-32/s_roundevenf.c | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/sysdeps/ieee754/flt-32/s_roundevenf.c b/sysdeps/ieee754/flt-32/s_roundevenf.c deleted file mode 100644 index 4a8c2624bb..0000000000 --- a/sysdeps/ieee754/flt-32/s_roundevenf.c +++ /dev/null @@ -1,68 +0,0 @@ -/* Round to nearest integer value, rounding halfway cases to even. - flt-32 version. - Copyright (C) 2016-2017 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> -#include <stdint.h> - -#define BIAS 0x7f -#define MANT_DIG 24 -#define MAX_EXP (2 * BIAS + 1) - -float -roundevenf (float x) -{ - uint32_t ix, ux; - GET_FLOAT_WORD (ix, x); - ux = ix & 0x7fffffff; - 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; - uint32_t half_bit = 1U << half_pos; - uint32_t int_bit = 1U << 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 > 0x3f000000) - /* Interval (0.5, 1). */ - ix = (ix & 0x80000000) | 0x3f800000; - else - /* Rounds to 0. */ - ix &= 0x80000000; - SET_FLOAT_WORD (x, ix); - return x; -} |