| /* Software floating-point emulation. |
| Basic eight-word fraction declaration and manipulation. |
| Copyright (C) 1997-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Richard Henderson (rth@cygnus.com), |
| Jakub Jelinek (jj@ultra.linux.cz) and |
| Peter Maydell (pmaydell@chiark.greenend.org.uk). |
| |
| 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. |
| |
| In addition to the permissions in the GNU Lesser General Public |
| License, the Free Software Foundation gives you unlimited |
| permission to link the compiled version of this file into |
| combinations with other programs, and to distribute those |
| combinations without any restriction coming from the use of this |
| file. (The Lesser General Public License restrictions do apply in |
| other respects; for example, they cover modification of the file, |
| and distribution when not linked into a combine executable.) |
| |
| 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/>. */ |
| |
| #ifndef SOFT_FP_OP_8_H |
| #define SOFT_FP_OP_8_H 1 |
| |
| /* We need just a few things from here for op-4, if we ever need some |
| other macros, they can be added. */ |
| #define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8] |
| #define _FP_FRAC_HIGH_8(X) (X##_f[7]) |
| #define _FP_FRAC_LOW_8(X) (X##_f[0]) |
| #define _FP_FRAC_WORD_8(X, w) (X##_f[w]) |
| |
| #define _FP_FRAC_SLL_8(X, N) \ |
| do \ |
| { \ |
| _FP_I_TYPE _FP_FRAC_SLL_8_up, _FP_FRAC_SLL_8_down; \ |
| _FP_I_TYPE _FP_FRAC_SLL_8_skip, _FP_FRAC_SLL_8_i; \ |
| _FP_FRAC_SLL_8_skip = (N) / _FP_W_TYPE_SIZE; \ |
| _FP_FRAC_SLL_8_up = (N) % _FP_W_TYPE_SIZE; \ |
| _FP_FRAC_SLL_8_down = _FP_W_TYPE_SIZE - _FP_FRAC_SLL_8_up; \ |
| if (!_FP_FRAC_SLL_8_up) \ |
| for (_FP_FRAC_SLL_8_i = 7; \ |
| _FP_FRAC_SLL_8_i >= _FP_FRAC_SLL_8_skip; \ |
| --_FP_FRAC_SLL_8_i) \ |
| X##_f[_FP_FRAC_SLL_8_i] \ |
| = X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip]; \ |
| else \ |
| { \ |
| for (_FP_FRAC_SLL_8_i = 7; \ |
| _FP_FRAC_SLL_8_i > _FP_FRAC_SLL_8_skip; \ |
| --_FP_FRAC_SLL_8_i) \ |
| X##_f[_FP_FRAC_SLL_8_i] \ |
| = ((X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip] \ |
| << _FP_FRAC_SLL_8_up) \ |
| | (X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip-1] \ |
| >> _FP_FRAC_SLL_8_down)); \ |
| X##_f[_FP_FRAC_SLL_8_i--] = X##_f[0] << _FP_FRAC_SLL_8_up; \ |
| } \ |
| for (; _FP_FRAC_SLL_8_i >= 0; --_FP_FRAC_SLL_8_i) \ |
| X##_f[_FP_FRAC_SLL_8_i] = 0; \ |
| } \ |
| while (0) |
| |
| #define _FP_FRAC_SRL_8(X, N) \ |
| do \ |
| { \ |
| _FP_I_TYPE _FP_FRAC_SRL_8_up, _FP_FRAC_SRL_8_down; \ |
| _FP_I_TYPE _FP_FRAC_SRL_8_skip, _FP_FRAC_SRL_8_i; \ |
| _FP_FRAC_SRL_8_skip = (N) / _FP_W_TYPE_SIZE; \ |
| _FP_FRAC_SRL_8_down = (N) % _FP_W_TYPE_SIZE; \ |
| _FP_FRAC_SRL_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRL_8_down; \ |
| if (!_FP_FRAC_SRL_8_down) \ |
| for (_FP_FRAC_SRL_8_i = 0; \ |
| _FP_FRAC_SRL_8_i <= 7-_FP_FRAC_SRL_8_skip; \ |
| ++_FP_FRAC_SRL_8_i) \ |
| X##_f[_FP_FRAC_SRL_8_i] \ |
| = X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip]; \ |
| else \ |
| { \ |
| for (_FP_FRAC_SRL_8_i = 0; \ |
| _FP_FRAC_SRL_8_i < 7-_FP_FRAC_SRL_8_skip; \ |
| ++_FP_FRAC_SRL_8_i) \ |
| X##_f[_FP_FRAC_SRL_8_i] \ |
| = ((X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip] \ |
| >> _FP_FRAC_SRL_8_down) \ |
| | (X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip+1] \ |
| << _FP_FRAC_SRL_8_up)); \ |
| X##_f[_FP_FRAC_SRL_8_i++] = X##_f[7] >> _FP_FRAC_SRL_8_down; \ |
| } \ |
| for (; _FP_FRAC_SRL_8_i < 8; ++_FP_FRAC_SRL_8_i) \ |
| X##_f[_FP_FRAC_SRL_8_i] = 0; \ |
| } \ |
| while (0) |
| |
| |
| /* Right shift with sticky-lsb. |
| What this actually means is that we do a standard right-shift, |
| but that if any of the bits that fall off the right hand side |
| were one then we always set the LSbit. */ |
| #define _FP_FRAC_SRS_8(X, N, size) \ |
| do \ |
| { \ |
| _FP_I_TYPE _FP_FRAC_SRS_8_up, _FP_FRAC_SRS_8_down; \ |
| _FP_I_TYPE _FP_FRAC_SRS_8_skip, _FP_FRAC_SRS_8_i; \ |
| _FP_W_TYPE _FP_FRAC_SRS_8_s; \ |
| _FP_FRAC_SRS_8_skip = (N) / _FP_W_TYPE_SIZE; \ |
| _FP_FRAC_SRS_8_down = (N) % _FP_W_TYPE_SIZE; \ |
| _FP_FRAC_SRS_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRS_8_down; \ |
| for (_FP_FRAC_SRS_8_s = _FP_FRAC_SRS_8_i = 0; \ |
| _FP_FRAC_SRS_8_i < _FP_FRAC_SRS_8_skip; \ |
| ++_FP_FRAC_SRS_8_i) \ |
| _FP_FRAC_SRS_8_s |= X##_f[_FP_FRAC_SRS_8_i]; \ |
| if (!_FP_FRAC_SRS_8_down) \ |
| for (_FP_FRAC_SRS_8_i = 0; \ |
| _FP_FRAC_SRS_8_i <= 7-_FP_FRAC_SRS_8_skip; \ |
| ++_FP_FRAC_SRS_8_i) \ |
| X##_f[_FP_FRAC_SRS_8_i] \ |
| = X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip]; \ |
| else \ |
| { \ |
| _FP_FRAC_SRS_8_s \ |
| |= X##_f[_FP_FRAC_SRS_8_i] << _FP_FRAC_SRS_8_up; \ |
| for (_FP_FRAC_SRS_8_i = 0; \ |
| _FP_FRAC_SRS_8_i < 7-_FP_FRAC_SRS_8_skip; \ |
| ++_FP_FRAC_SRS_8_i) \ |
| X##_f[_FP_FRAC_SRS_8_i] \ |
| = ((X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip] \ |
| >> _FP_FRAC_SRS_8_down) \ |
| | (X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip+1] \ |
| << _FP_FRAC_SRS_8_up)); \ |
| X##_f[_FP_FRAC_SRS_8_i++] = X##_f[7] >> _FP_FRAC_SRS_8_down; \ |
| } \ |
| for (; _FP_FRAC_SRS_8_i < 8; ++_FP_FRAC_SRS_8_i) \ |
| X##_f[_FP_FRAC_SRS_8_i] = 0; \ |
| /* Don't fix the LSB until the very end when we're sure f[0] is \ |
| stable. */ \ |
| X##_f[0] |= (_FP_FRAC_SRS_8_s != 0); \ |
| } \ |
| while (0) |
| |
| #endif /* !SOFT_FP_OP_8_H */ |
