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a2f8be9c83
This patch makes soft-fp headers consistently use multiple-include guards, something previously done mainly only in the Linux kernel version. The guard macros aren't the same as those used in the Linux kernel, but there seems to be enough variation in such guards in Linux kernel code that hopefully this version will be acceptable there. Tested for powerpc-nofpu that installed stripped shared libraries are unchanged by this patch. * soft-fp/double.h [SOFT_FP_DOUBLE_H]: New multiple-include guard. * soft-fp/extended.h [SOFT_FP_EXTENDED_H]: Likewise. * soft-fp/op-1.h [SOFT_FP_OP_1_H]: Likewise. * soft-fp/op-2.h [SOFT_FP_OP_2_H]: Likewise. * soft-fp/op-4.h [SOFT_FP_OP_4_H]: Likewise. * soft-fp/op-8.h [SOFT_FP_OP_8_H]: Likewise. * soft-fp/op-common.h [SOFT_FP_OP_COMMON_H]: Likewise. * soft-fp/quad.h [SOFT_FP_QUAD_H]: Likewise. * soft-fp/single.h [SOFT_FP_SINGLE_H]: Likewise. * soft-fp/soft-fp.h (SOFT_FP_H): Define to 1 rather than empty. Add comment on closing #endif.
151 lines
6.0 KiB
C
151 lines
6.0 KiB
C
/* Software floating-point emulation.
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Basic eight-word fraction declaration and manipulation.
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Copyright (C) 1997-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@cygnus.com),
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Jakub Jelinek (jj@ultra.linux.cz) and
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Peter Maydell (pmaydell@chiark.greenend.org.uk).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file into
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combinations with other programs, and to distribute those
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combinations without any restriction coming from the use of this
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file. (The Lesser General Public License restrictions do apply in
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other respects; for example, they cover modification of the file,
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and distribution when not linked into a combine executable.)
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef SOFT_FP_OP_8_H
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#define SOFT_FP_OP_8_H 1
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/* We need just a few things from here for op-4, if we ever need some
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other macros, they can be added. */
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#define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8]
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#define _FP_FRAC_HIGH_8(X) (X##_f[7])
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#define _FP_FRAC_LOW_8(X) (X##_f[0])
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#define _FP_FRAC_WORD_8(X, w) (X##_f[w])
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#define _FP_FRAC_SLL_8(X, N) \
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do \
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{ \
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_FP_I_TYPE _FP_FRAC_SLL_8_up, _FP_FRAC_SLL_8_down; \
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_FP_I_TYPE _FP_FRAC_SLL_8_skip, _FP_FRAC_SLL_8_i; \
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_FP_FRAC_SLL_8_skip = (N) / _FP_W_TYPE_SIZE; \
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_FP_FRAC_SLL_8_up = (N) % _FP_W_TYPE_SIZE; \
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_FP_FRAC_SLL_8_down = _FP_W_TYPE_SIZE - _FP_FRAC_SLL_8_up; \
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if (!_FP_FRAC_SLL_8_up) \
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for (_FP_FRAC_SLL_8_i = 7; \
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_FP_FRAC_SLL_8_i >= _FP_FRAC_SLL_8_skip; \
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--_FP_FRAC_SLL_8_i) \
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X##_f[_FP_FRAC_SLL_8_i] \
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= X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip]; \
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else \
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{ \
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for (_FP_FRAC_SLL_8_i = 7; \
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_FP_FRAC_SLL_8_i > _FP_FRAC_SLL_8_skip; \
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--_FP_FRAC_SLL_8_i) \
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X##_f[_FP_FRAC_SLL_8_i] \
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= ((X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip] \
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<< _FP_FRAC_SLL_8_up) \
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>> _FP_FRAC_SLL_8_down)); \
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X##_f[_FP_FRAC_SLL_8_i--] = X##_f[0] << _FP_FRAC_SLL_8_up; \
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} \
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for (; _FP_FRAC_SLL_8_i >= 0; --_FP_FRAC_SLL_8_i) \
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X##_f[_FP_FRAC_SLL_8_i] = 0; \
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} \
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while (0)
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#define _FP_FRAC_SRL_8(X, N) \
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do \
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{ \
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_FP_I_TYPE _FP_FRAC_SRL_8_up, _FP_FRAC_SRL_8_down; \
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_FP_I_TYPE _FP_FRAC_SRL_8_skip, _FP_FRAC_SRL_8_i; \
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_FP_FRAC_SRL_8_skip = (N) / _FP_W_TYPE_SIZE; \
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_FP_FRAC_SRL_8_down = (N) % _FP_W_TYPE_SIZE; \
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_FP_FRAC_SRL_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRL_8_down; \
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if (!_FP_FRAC_SRL_8_down) \
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for (_FP_FRAC_SRL_8_i = 0; \
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_FP_FRAC_SRL_8_i <= 7-_FP_FRAC_SRL_8_skip; \
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++_FP_FRAC_SRL_8_i) \
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X##_f[_FP_FRAC_SRL_8_i] \
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= X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip]; \
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else \
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{ \
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for (_FP_FRAC_SRL_8_i = 0; \
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_FP_FRAC_SRL_8_i < 7-_FP_FRAC_SRL_8_skip; \
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++_FP_FRAC_SRL_8_i) \
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X##_f[_FP_FRAC_SRL_8_i] \
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= ((X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip] \
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>> _FP_FRAC_SRL_8_down) \
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<< _FP_FRAC_SRL_8_up)); \
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X##_f[_FP_FRAC_SRL_8_i++] = X##_f[7] >> _FP_FRAC_SRL_8_down; \
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} \
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for (; _FP_FRAC_SRL_8_i < 8; ++_FP_FRAC_SRL_8_i) \
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X##_f[_FP_FRAC_SRL_8_i] = 0; \
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} \
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while (0)
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/* Right shift with sticky-lsb.
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What this actually means is that we do a standard right-shift,
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but that if any of the bits that fall off the right hand side
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were one then we always set the LSbit. */
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#define _FP_FRAC_SRS_8(X, N, size) \
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do \
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{ \
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_FP_I_TYPE _FP_FRAC_SRS_8_up, _FP_FRAC_SRS_8_down; \
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_FP_I_TYPE _FP_FRAC_SRS_8_skip, _FP_FRAC_SRS_8_i; \
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_FP_W_TYPE _FP_FRAC_SRS_8_s; \
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_FP_FRAC_SRS_8_skip = (N) / _FP_W_TYPE_SIZE; \
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_FP_FRAC_SRS_8_down = (N) % _FP_W_TYPE_SIZE; \
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_FP_FRAC_SRS_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRS_8_down; \
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for (_FP_FRAC_SRS_8_s = _FP_FRAC_SRS_8_i = 0; \
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_FP_FRAC_SRS_8_i < _FP_FRAC_SRS_8_skip; \
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++_FP_FRAC_SRS_8_i) \
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_FP_FRAC_SRS_8_s |= X##_f[_FP_FRAC_SRS_8_i]; \
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if (!_FP_FRAC_SRS_8_down) \
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for (_FP_FRAC_SRS_8_i = 0; \
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_FP_FRAC_SRS_8_i <= 7-_FP_FRAC_SRS_8_skip; \
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++_FP_FRAC_SRS_8_i) \
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X##_f[_FP_FRAC_SRS_8_i] \
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= X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip]; \
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else \
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{ \
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_FP_FRAC_SRS_8_s \
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|= X##_f[_FP_FRAC_SRS_8_i] << _FP_FRAC_SRS_8_up; \
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for (_FP_FRAC_SRS_8_i = 0; \
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_FP_FRAC_SRS_8_i < 7-_FP_FRAC_SRS_8_skip; \
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++_FP_FRAC_SRS_8_i) \
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X##_f[_FP_FRAC_SRS_8_i] \
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= ((X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip] \
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>> _FP_FRAC_SRS_8_down) \
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<< _FP_FRAC_SRS_8_up)); \
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X##_f[_FP_FRAC_SRS_8_i++] = X##_f[7] >> _FP_FRAC_SRS_8_down; \
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} \
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for (; _FP_FRAC_SRS_8_i < 8; ++_FP_FRAC_SRS_8_i) \
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X##_f[_FP_FRAC_SRS_8_i] = 0; \
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/* Don't fix the LSB until the very end when we're sure f[0] is \
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stable. */ \
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X##_f[0] |= (_FP_FRAC_SRS_8_s != 0); \
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} \
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while (0)
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#endif /* !SOFT_FP_OP_8_H */
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