1 /* Software floating-point emulation: convert to fortran nearest.
2 Copyright (C) 1997-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include "local-soft-fp.h"
20
21 long
_OtsNintXQ(long al,long ah,long _round)22 _OtsNintXQ (long al, long ah, long _round)
23 {
24 FP_DECL_EX;
25 FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
26 unsigned long r;
27 long s;
28
29 /* If bit 3 is set, then integer overflow detection is requested. */
30 s = _round & 8 ? 1 : -1;
31 _round = _round & 3;
32
33 FP_INIT_ROUNDMODE;
34 AXP_UNPACK_SEMIRAW_Q(A, a);
35
36 /* Build 0.5 * sign(A) */
37 B_e = _FP_EXPBIAS_Q;
38 __FP_FRAC_SET_2 (B, 0, 0);
39 B_s = A_s;
40
41 FP_ADD_Q(C, A, B);
42 _FP_FRAC_SRL_2(C, _FP_WORKBITS);
43 _FP_FRAC_HIGH_RAW_Q(C) &= ~(_FP_W_TYPE)_FP_IMPLBIT_Q;
44 FP_TO_INT_Q(r, C, 64, s);
45 if (s > 0 && (_fex &= FP_EX_INVALID))
46 FP_HANDLE_EXCEPTIONS;
47
48 return r;
49 }
50