diff options
Diffstat (limited to 'REORG.TODO/soft-fp/op-8.h')
| -rw-r--r-- | REORG.TODO/soft-fp/op-8.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/REORG.TODO/soft-fp/op-8.h b/REORG.TODO/soft-fp/op-8.h new file mode 100644 index 0000000000..1f424e102d --- /dev/null +++ b/REORG.TODO/soft-fp/op-8.h @@ -0,0 +1,150 @@ +/* Software floating-point emulation. + Basic eight-word fraction declaration and manipulation. + Copyright (C) 1997-2017 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 */ |