1999-12-30 02:11:48 +08:00
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/* Software floating-point emulation.
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Basic eight-word fraction declaration and manipulation.
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2019-01-01 08:11:28 +08:00
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Copyright (C) 1997-2019 Free Software Foundation, Inc.
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1999-12-30 02:11:48 +08:00
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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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2001-07-06 12:58:11 +08:00
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1999-12-30 02:11:48 +08:00
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 12:58:11 +08:00
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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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1999-12-30 02:11:48 +08:00
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2006-04-04 16:25:52 +08:00
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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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1999-12-30 02:11:48 +08:00
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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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2001-07-06 12:58:11 +08:00
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Lesser General Public License for more details.
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1999-12-30 02:11:48 +08:00
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2001-07-06 12:58:11 +08:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-10 07:18:22 +08:00
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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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1999-12-30 02:11:48 +08:00
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2015-03-10 08:32:29 +08:00
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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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1999-12-30 02:11:48 +08:00
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/* We need just a few things from here for op-4, if we ever need some
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2014-09-18 06:20:45 +08:00
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other macros, they can be added. */
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1999-12-30 02:11:48 +08:00
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#define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8]
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soft-fp: Add implementation for 128 bit self-contained
Here only add the implementation when building the RV32 port.
These macros are used when the following situations occur at the same
time: soft-fp fma, ldbl-128 and 32-bit _FP_W_TYPE_SIZE. The RISC-V
32-bit port is the first port which use all three together.
This is the building flow about the situation:
When building soft-fp/s_fmal.c, there uses the FP_FMA_Q in __fmal.
The _FP_W_TYPE_SIZE is defined to 32-bit in sysdeps/riscv/sfp-machine.h,
so the FP_FMA_Q was defined to _FP_FMA (Q, 4, 8, R, X, Y, Z) in
soft-fp/quad.h.
Something in the soft-fp/quad.h:
#if _FP_W_TYPE_SIZE < 64
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 4, 8, R, X, Y, Z)
#else
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 2, 4, R, X, Y, Z)
#endif
Finally, in _FP_FMA (fs, wc, dwc, R, X, Y, Z), it will use the
_FP_FRAC_HIGHBIT_DW_##dwc macro, and it will be expanded to
_FP_FRAC_HIGHBIT_DW_8, but the _FP_FRAC_HIGHBIT_DW_8 is not be
implemented in soft-fp/op-8.h. there is only _FP_FRAC_HIGHBIT_DW_1,
_FP_FRAC_HIGHBIT_DW_2 and _FP_FRAC_HIGHBIT_DW_4 in the
soft-fp/op-*.h.
After this modification, we can pass the soft floating testing of glibc
testsuites on RV32.
* soft-fp/op-8.h (_FP_FRAC_SET_8, _FP_FRAC_ADD_8, _FP_FRAC_SUB_8)
(_FP_FRAC_CLZ_8, _FP_MINFRAC_8, _FP_FRAC_NEGP_8, _FP_FRAC_ZEROP_8)
(_FP_FRAC_HIGHBIT_DW_8, _FP_FRAC_COPY_4_8, _FP_FRAC_COPY_8_4)
(__FP_FRAC_SET_8): Add implementation for RV32 use.
2018-11-02 02:22:00 +08:00
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#define _FP_FRAC_SET_8(X, I) __FP_FRAC_SET_8 (X, I)
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1999-12-30 02:11:48 +08:00
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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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2013-10-16 09:22:21 +08:00
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#define _FP_FRAC_WORD_8(X, w) (X##_f[w])
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1999-12-30 02:11:48 +08:00
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2014-07-01 01:37:10 +08:00
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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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2013-10-15 08:17:35 +08:00
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while (0)
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1999-12-30 02:11:48 +08:00
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2014-07-01 01:37:10 +08:00
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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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2013-10-15 08:17:35 +08:00
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while (0)
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1999-12-30 02:11:48 +08:00
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2013-06-06 04:44:03 +08:00
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/* Right shift with sticky-lsb.
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2014-09-18 06:20:45 +08:00
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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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2013-10-16 09:22:21 +08:00
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#define _FP_FRAC_SRS_8(X, N, size) \
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2013-10-15 08:17:35 +08:00
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do \
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{ \
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2014-07-01 01:37:10 +08:00
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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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2013-10-15 08:17:35 +08:00
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else \
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{ \
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2014-07-01 01:37:10 +08:00
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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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2013-10-15 08:17:35 +08:00
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} \
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2014-07-01 01:37:10 +08:00
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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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2014-09-18 06:20:45 +08:00
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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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2014-07-01 01:37:10 +08:00
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X##_f[0] |= (_FP_FRAC_SRS_8_s != 0); \
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2013-10-15 08:17:35 +08:00
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} \
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while (0)
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2015-03-10 08:32:29 +08:00
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soft-fp: Add implementation for 128 bit self-contained
Here only add the implementation when building the RV32 port.
These macros are used when the following situations occur at the same
time: soft-fp fma, ldbl-128 and 32-bit _FP_W_TYPE_SIZE. The RISC-V
32-bit port is the first port which use all three together.
This is the building flow about the situation:
When building soft-fp/s_fmal.c, there uses the FP_FMA_Q in __fmal.
The _FP_W_TYPE_SIZE is defined to 32-bit in sysdeps/riscv/sfp-machine.h,
so the FP_FMA_Q was defined to _FP_FMA (Q, 4, 8, R, X, Y, Z) in
soft-fp/quad.h.
Something in the soft-fp/quad.h:
#if _FP_W_TYPE_SIZE < 64
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 4, 8, R, X, Y, Z)
#else
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 2, 4, R, X, Y, Z)
#endif
Finally, in _FP_FMA (fs, wc, dwc, R, X, Y, Z), it will use the
_FP_FRAC_HIGHBIT_DW_##dwc macro, and it will be expanded to
_FP_FRAC_HIGHBIT_DW_8, but the _FP_FRAC_HIGHBIT_DW_8 is not be
implemented in soft-fp/op-8.h. there is only _FP_FRAC_HIGHBIT_DW_1,
_FP_FRAC_HIGHBIT_DW_2 and _FP_FRAC_HIGHBIT_DW_4 in the
soft-fp/op-*.h.
After this modification, we can pass the soft floating testing of glibc
testsuites on RV32.
* soft-fp/op-8.h (_FP_FRAC_SET_8, _FP_FRAC_ADD_8, _FP_FRAC_SUB_8)
(_FP_FRAC_CLZ_8, _FP_MINFRAC_8, _FP_FRAC_NEGP_8, _FP_FRAC_ZEROP_8)
(_FP_FRAC_HIGHBIT_DW_8, _FP_FRAC_COPY_4_8, _FP_FRAC_COPY_8_4)
(__FP_FRAC_SET_8): Add implementation for RV32 use.
2018-11-02 02:22:00 +08:00
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#define _FP_FRAC_ADD_8(R, X, Y) \
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do \
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{ \
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_FP_W_TYPE _FP_FRAC_ADD_8_c = 0; \
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_FP_I_TYPE _FP_FRAC_ADD_8_i; \
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for (_FP_FRAC_ADD_8_i = 0; _FP_FRAC_ADD_8_i < 8; ++_FP_FRAC_ADD_8_i) \
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{ \
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R##_f[_FP_FRAC_ADD_8_i] \
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= (X##_f[_FP_FRAC_ADD_8_i] + Y##_f[_FP_FRAC_ADD_8_i] \
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+ _FP_FRAC_ADD_8_c); \
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_FP_FRAC_ADD_8_c \
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= (_FP_FRAC_ADD_8_c \
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? R##_f[_FP_FRAC_ADD_8_i] <= X##_f[_FP_FRAC_ADD_8_i] \
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: R##_f[_FP_FRAC_ADD_8_i] < X##_f[_FP_FRAC_ADD_8_i]); \
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} \
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} \
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while (0)
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#define _FP_FRAC_SUB_8(R, X, Y) \
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do \
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{ \
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_FP_W_TYPE _FP_FRAC_SUB_8_tmp[8]; \
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_FP_W_TYPE _FP_FRAC_SUB_8_c = 0; \
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_FP_I_TYPE _FP_FRAC_SUB_8_i; \
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for (_FP_FRAC_SUB_8_i = 0; _FP_FRAC_SUB_8_i < 8; ++_FP_FRAC_SUB_8_i) \
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{ \
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_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i] \
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= (X##_f[_FP_FRAC_SUB_8_i] - Y##_f[_FP_FRAC_SUB_8_i] \
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- _FP_FRAC_SUB_8_c); \
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_FP_FRAC_SUB_8_c \
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= (_FP_FRAC_SUB_8_c \
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? (_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i] \
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>= X##_f[_FP_FRAC_SUB_8_i]) \
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: (_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i] \
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> X##_f[_FP_FRAC_SUB_8_i])); \
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} \
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for (_FP_FRAC_SUB_8_i = 0; _FP_FRAC_SUB_8_i < 8; ++_FP_FRAC_SUB_8_i) \
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R##_f[_FP_FRAC_SUB_8_i] = _FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i]; \
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} \
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while (0)
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#define _FP_FRAC_CLZ_8(R, X) \
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do \
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{ \
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_FP_I_TYPE _FP_FRAC_CLZ_8_i; \
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for (_FP_FRAC_CLZ_8_i = 7; _FP_FRAC_CLZ_8_i > 0; _FP_FRAC_CLZ_8_i--) \
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if (X##_f[_FP_FRAC_CLZ_8_i]) \
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break; \
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__FP_CLZ ((R), X##_f[_FP_FRAC_CLZ_8_i]); \
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(R) += _FP_W_TYPE_SIZE * (7 - _FP_FRAC_CLZ_8_i); \
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} \
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while (0)
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#define _FP_MINFRAC_8 0, 0, 0, 0, 0, 0, 0, 1
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#define _FP_FRAC_NEGP_8(X) ((_FP_WS_TYPE) X##_f[7] < 0)
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#define _FP_FRAC_ZEROP_8(X) \
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((X##_f[0] | X##_f[1] | X##_f[2] | X##_f[3] \
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| X##_f[4] | X##_f[5] | X##_f[6] | X##_f[7]) == 0)
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#define _FP_FRAC_HIGHBIT_DW_8(fs, X) \
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(_FP_FRAC_HIGH_DW_##fs (X) & _FP_HIGHBIT_DW_##fs)
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#define _FP_FRAC_COPY_4_8(D, S) \
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do \
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{ \
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D##_f[0] = S##_f[0]; \
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D##_f[1] = S##_f[1]; \
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D##_f[2] = S##_f[2]; \
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D##_f[3] = S##_f[3]; \
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} \
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while (0)
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#define _FP_FRAC_COPY_8_4(D, S) \
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do \
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{ \
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D##_f[0] = S##_f[0]; \
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D##_f[1] = S##_f[1]; \
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D##_f[2] = S##_f[2]; \
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D##_f[3] = S##_f[3]; \
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D##_f[4] = D##_f[5] = D##_f[6] = D##_f[7]= 0; \
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} \
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while (0)
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#define __FP_FRAC_SET_8(X, I7, I6, I5, I4, I3, I2, I1, I0) \
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(X##_f[7] = I7, X##_f[6] = I6, X##_f[5] = I5, X##_f[4] = I4, \
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X##_f[3] = I3, X##_f[2] = I2, X##_f[1] = I1, X##_f[0] = I0)
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2015-03-10 08:32:29 +08:00
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#endif /* !SOFT_FP_OP_8_H */
|
