315 lines
9.2 KiB
C
315 lines
9.2 KiB
C
/* Software floating-point emulation.
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Definitions for IEEE Double Precision
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Copyright (C) 1997-2013 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),
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David S. Miller (davem@redhat.com) 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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#if _FP_W_TYPE_SIZE < 32
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# error "Here's a nickel kid. Go buy yourself a real computer."
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#endif
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#if _FP_W_TYPE_SIZE < 64
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# define _FP_FRACTBITS_D (2 * _FP_W_TYPE_SIZE)
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# define _FP_FRACTBITS_DW_D (4 * _FP_W_TYPE_SIZE)
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#else
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# define _FP_FRACTBITS_D _FP_W_TYPE_SIZE
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# define _FP_FRACTBITS_DW_D (2 * _FP_W_TYPE_SIZE)
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#endif
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#define _FP_FRACBITS_D 53
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#define _FP_FRACXBITS_D (_FP_FRACTBITS_D - _FP_FRACBITS_D)
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#define _FP_WFRACBITS_D (_FP_WORKBITS + _FP_FRACBITS_D)
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#define _FP_WFRACXBITS_D (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
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#define _FP_EXPBITS_D 11
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#define _FP_EXPBIAS_D 1023
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#define _FP_EXPMAX_D 2047
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#define _FP_QNANBIT_D \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
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#define _FP_QNANBIT_SH_D \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
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#define _FP_IMPLBIT_D \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
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#define _FP_IMPLBIT_SH_D \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
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#define _FP_OVERFLOW_D \
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((_FP_W_TYPE) 1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
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#define _FP_WFRACBITS_DW_D (2 * _FP_WFRACBITS_D)
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#define _FP_WFRACXBITS_DW_D (_FP_FRACTBITS_DW_D - _FP_WFRACBITS_DW_D)
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#define _FP_HIGHBIT_DW_D \
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((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_D - 1) % _FP_W_TYPE_SIZE)
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typedef float DFtype __attribute__ ((mode (DF)));
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#if _FP_W_TYPE_SIZE < 64
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union _FP_UNION_D
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{
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DFtype flt;
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struct _FP_STRUCT_LAYOUT
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{
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# if __BYTE_ORDER == __BIG_ENDIAN
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unsigned sign : 1;
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unsigned exp : _FP_EXPBITS_D;
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unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
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unsigned frac0 : _FP_W_TYPE_SIZE;
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# else
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unsigned frac0 : _FP_W_TYPE_SIZE;
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unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
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unsigned exp : _FP_EXPBITS_D;
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unsigned sign : 1;
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# endif
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} bits __attribute__ ((packed));
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};
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# define FP_DECL_D(X) _FP_DECL (2, X)
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# define FP_UNPACK_RAW_D(X, val) _FP_UNPACK_RAW_2 (D, X, val)
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# define FP_UNPACK_RAW_DP(X, val) _FP_UNPACK_RAW_2_P (D, X, val)
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# define FP_PACK_RAW_D(val, X) _FP_PACK_RAW_2 (D, val, X)
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# define FP_PACK_RAW_DP(val, X) \
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do \
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{ \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_2_P (D, val, X); \
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} \
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while (0)
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# define FP_UNPACK_D(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2 (D, X, val); \
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_FP_UNPACK_CANONICAL (D, 2, X); \
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} \
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while (0)
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# define FP_UNPACK_DP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2_P (D, X, val); \
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_FP_UNPACK_CANONICAL (D, 2, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_D(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2 (D, X, val); \
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_FP_UNPACK_SEMIRAW (D, 2, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_DP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2_P (D, X, val); \
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_FP_UNPACK_SEMIRAW (D, 2, X); \
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} \
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while (0)
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# define FP_PACK_D(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (D, 2, X); \
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_FP_PACK_RAW_2 (D, val, X); \
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} \
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while (0)
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# define FP_PACK_DP(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (D, 2, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_2_P (D, val, X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_D(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (D, 2, X); \
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_FP_PACK_RAW_2 (D, val, X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_DP(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (D, 2, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_2_P (D, val, X); \
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} \
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while (0)
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# define FP_ISSIGNAN_D(X) _FP_ISSIGNAN (D, 2, X)
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# define FP_NEG_D(R, X) _FP_NEG (D, 2, R, X)
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# define FP_ADD_D(R, X, Y) _FP_ADD (D, 2, R, X, Y)
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# define FP_SUB_D(R, X, Y) _FP_SUB (D, 2, R, X, Y)
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# define FP_MUL_D(R, X, Y) _FP_MUL (D, 2, R, X, Y)
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# define FP_DIV_D(R, X, Y) _FP_DIV (D, 2, R, X, Y)
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# define FP_SQRT_D(R, X) _FP_SQRT (D, 2, R, X)
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# define _FP_SQRT_MEAT_D(R, S, T, X, Q) _FP_SQRT_MEAT_2 (R, S, T, X, Q)
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# define FP_FMA_D(R, X, Y, Z) _FP_FMA (D, 2, 4, R, X, Y, Z)
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# define FP_CMP_D(r, X, Y, un) _FP_CMP (D, 2, r, X, Y, un)
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# define FP_CMP_EQ_D(r, X, Y) _FP_CMP_EQ (D, 2, r, X, Y)
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# define FP_CMP_UNORD_D(r, X, Y) _FP_CMP_UNORD (D, 2, r, X, Y)
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# define FP_TO_INT_D(r, X, rsz, rsg) _FP_TO_INT (D, 2, r, X, rsz, rsg)
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# define FP_FROM_INT_D(X, r, rs, rt) _FP_FROM_INT (D, 2, X, r, rs, rt)
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# define _FP_FRAC_HIGH_D(X) _FP_FRAC_HIGH_2 (X)
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# define _FP_FRAC_HIGH_RAW_D(X) _FP_FRAC_HIGH_2 (X)
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# define _FP_FRAC_HIGH_DW_D(X) _FP_FRAC_HIGH_4 (X)
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#else
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union _FP_UNION_D
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{
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DFtype flt;
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struct _FP_STRUCT_LAYOUT
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{
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# if __BYTE_ORDER == __BIG_ENDIAN
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unsigned sign : 1;
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unsigned exp : _FP_EXPBITS_D;
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_FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
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# else
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_FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
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unsigned exp : _FP_EXPBITS_D;
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unsigned sign : 1;
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# endif
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} bits __attribute__ ((packed));
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};
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# define FP_DECL_D(X) _FP_DECL (1, X)
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# define FP_UNPACK_RAW_D(X, val) _FP_UNPACK_RAW_1 (D, X, val)
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# define FP_UNPACK_RAW_DP(X, val) _FP_UNPACK_RAW_1_P (D, X, val)
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# define FP_PACK_RAW_D(val, X) _FP_PACK_RAW_1 (D, val, X)
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# define FP_PACK_RAW_DP(val, X) \
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do \
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{ \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_1_P (D, val, X); \
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} \
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while (0)
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# define FP_UNPACK_D(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1 (D, X, val); \
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_FP_UNPACK_CANONICAL (D, 1, X); \
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} \
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while (0)
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# define FP_UNPACK_DP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1_P (D, X, val); \
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_FP_UNPACK_CANONICAL (D, 1, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_D(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1 (D, X, val); \
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_FP_UNPACK_SEMIRAW (D, 1, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_DP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1_P (D, X, val); \
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_FP_UNPACK_SEMIRAW (D, 1, X); \
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} \
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while (0)
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# define FP_PACK_D(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (D, 1, X); \
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_FP_PACK_RAW_1 (D, val, X); \
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} \
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while (0)
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# define FP_PACK_DP(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (D, 1, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_1_P (D, val, X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_D(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (D, 1, X); \
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_FP_PACK_RAW_1 (D, val, X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_DP(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (D, 1, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_1_P (D, val, X); \
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} \
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while (0)
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# define FP_ISSIGNAN_D(X) _FP_ISSIGNAN (D, 1, X)
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# define FP_NEG_D(R, X) _FP_NEG (D, 1, R, X)
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# define FP_ADD_D(R, X, Y) _FP_ADD (D, 1, R, X, Y)
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# define FP_SUB_D(R, X, Y) _FP_SUB (D, 1, R, X, Y)
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# define FP_MUL_D(R, X, Y) _FP_MUL (D, 1, R, X, Y)
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# define FP_DIV_D(R, X, Y) _FP_DIV (D, 1, R, X, Y)
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# define FP_SQRT_D(R, X) _FP_SQRT (D, 1, R, X)
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# define _FP_SQRT_MEAT_D(R, S, T, X, Q) _FP_SQRT_MEAT_1 (R, S, T, X, Q)
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# define FP_FMA_D(R, X, Y, Z) _FP_FMA (D, 1, 2, R, X, Y, Z)
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/* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
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the target machine. */
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# define FP_CMP_D(r, X, Y, un) _FP_CMP (D, 1, r, X, Y, un)
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# define FP_CMP_EQ_D(r, X, Y) _FP_CMP_EQ (D, 1, r, X, Y)
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# define FP_CMP_UNORD_D(r, X, Y) _FP_CMP_UNORD (D, 1, r, X, Y)
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# define FP_TO_INT_D(r, X, rsz, rsg) _FP_TO_INT (D, 1, r, X, rsz, rsg)
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# define FP_FROM_INT_D(X, r, rs, rt) _FP_FROM_INT (D, 1, X, r, rs, rt)
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# define _FP_FRAC_HIGH_D(X) _FP_FRAC_HIGH_1 (X)
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# define _FP_FRAC_HIGH_RAW_D(X) _FP_FRAC_HIGH_1 (X)
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# define _FP_FRAC_HIGH_DW_D(X) _FP_FRAC_HIGH_2 (X)
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#endif /* W_TYPE_SIZE < 64 */
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