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049375e2b5
Building for soft-float ColdFire produces an error in soft-fp:
In file included from ../sysdeps/ieee754/soft-fp/s_fmaf.c:42:
../soft-fp/single.h:85:3: error: 'packed' attribute ignored for field of type 'struct <anonymous>' [-Werror=attributes]
} bits __attribute__ ((packed));
^
While this error only appears in that particular case, this attribute
is in fact never useful, on any architecture. If you have
struct __attribute__ ((packed)) { ... } bits;
or
struct { ... } __attribute__ ((packed)) bits;
then the attribute affects the layout of the structure type. But with
the form used in this code
struct { ... } bits __attribute__ ((packed));
the field bits is being declared packed, but the layout of its type
has already been determined at that point. If on any platform the
layout of the sequence of bit-fields were wrong without the use of a
packed attribute, the attribute would need to be used via a definition
of _FP_STRUCT_LAYOUT, not in its present position.
So this patch removes the useless attribute to fix the build for
ColdFire soft-float. Tested with build-many-glibcs.py that installed
stripped shared libraries are unchanged by the patch.
* soft-fp/double.h (union _FP_UNION_D): Do not use attribute
packed on bits.
* soft-fp/extended.h (union _FP_UNION_E): Likewise.
* soft-fp/half.h (union _FP_UNION_H): Likewise.
* soft-fp/quad.h (union _FP_UNION_Q): Likewise.
* soft-fp/single.h (union _FP_UNION_S): Likewise.
171 lines
5.1 KiB
C
171 lines
5.1 KiB
C
/* Software floating-point emulation.
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Definitions for IEEE Half Precision.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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_HALF_H
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#define SOFT_FP_HALF_H 1
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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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#define _FP_FRACTBITS_H (_FP_W_TYPE_SIZE)
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#define _FP_FRACTBITS_DW_H (_FP_W_TYPE_SIZE)
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#define _FP_FRACBITS_H 11
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#define _FP_FRACXBITS_H (_FP_FRACTBITS_H - _FP_FRACBITS_H)
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#define _FP_WFRACBITS_H (_FP_WORKBITS + _FP_FRACBITS_H)
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#define _FP_WFRACXBITS_H (_FP_FRACTBITS_H - _FP_WFRACBITS_H)
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#define _FP_EXPBITS_H 5
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#define _FP_EXPBIAS_H 15
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#define _FP_EXPMAX_H 31
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#define _FP_QNANBIT_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-2))
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#define _FP_QNANBIT_SH_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-2+_FP_WORKBITS))
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#define _FP_IMPLBIT_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-1))
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#define _FP_IMPLBIT_SH_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-1+_FP_WORKBITS))
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#define _FP_OVERFLOW_H ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_H))
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#define _FP_WFRACBITS_DW_H (2 * _FP_WFRACBITS_H)
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#define _FP_WFRACXBITS_DW_H (_FP_FRACTBITS_DW_H - _FP_WFRACBITS_DW_H)
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#define _FP_HIGHBIT_DW_H \
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((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_H - 1) % _FP_W_TYPE_SIZE)
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/* The implementation of _FP_MUL_MEAT_H and _FP_DIV_MEAT_H should be
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chosen by the target machine. */
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typedef float HFtype __attribute__ ((mode (HF)));
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union _FP_UNION_H
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{
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HFtype 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_H;
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unsigned frac : _FP_FRACBITS_H - (_FP_IMPLBIT_H != 0);
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#else
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unsigned frac : _FP_FRACBITS_H - (_FP_IMPLBIT_H != 0);
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unsigned exp : _FP_EXPBITS_H;
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unsigned sign : 1;
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#endif
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} bits;
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};
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#define FP_DECL_H(X) _FP_DECL (1, X)
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#define FP_UNPACK_RAW_H(X, val) _FP_UNPACK_RAW_1 (H, X, (val))
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#define FP_UNPACK_RAW_HP(X, val) _FP_UNPACK_RAW_1_P (H, X, (val))
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#define FP_PACK_RAW_H(val, X) _FP_PACK_RAW_1 (H, (val), X)
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#define FP_PACK_RAW_HP(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 (H, (val), X); \
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} \
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while (0)
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#define FP_UNPACK_H(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1 (H, X, (val)); \
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_FP_UNPACK_CANONICAL (H, 1, X); \
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} \
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while (0)
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#define FP_UNPACK_HP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1_P (H, X, (val)); \
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_FP_UNPACK_CANONICAL (H, 1, X); \
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} \
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while (0)
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#define FP_UNPACK_SEMIRAW_H(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1 (H, X, (val)); \
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_FP_UNPACK_SEMIRAW (H, 1, X); \
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} \
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while (0)
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#define FP_UNPACK_SEMIRAW_HP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_1_P (H, X, (val)); \
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_FP_UNPACK_SEMIRAW (H, 1, X); \
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} \
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while (0)
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#define FP_PACK_H(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (H, 1, X); \
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_FP_PACK_RAW_1 (H, (val), X); \
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} \
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while (0)
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#define FP_PACK_HP(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (H, 1, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_1_P (H, (val), X); \
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} \
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while (0)
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#define FP_PACK_SEMIRAW_H(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (H, 1, X); \
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_FP_PACK_RAW_1 (H, (val), X); \
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} \
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while (0)
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#define FP_PACK_SEMIRAW_HP(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (H, 1, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_1_P (H, (val), X); \
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} \
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while (0)
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#define FP_TO_INT_H(r, X, rsz, rsg) _FP_TO_INT (H, 1, (r), X, (rsz), (rsg))
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#define FP_TO_INT_ROUND_H(r, X, rsz, rsg) \
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_FP_TO_INT_ROUND (H, 1, (r), X, (rsz), (rsg))
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#define FP_FROM_INT_H(X, r, rs, rt) _FP_FROM_INT (H, 1, X, (r), (rs), rt)
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/* HFmode arithmetic is not implemented. */
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#define _FP_FRAC_HIGH_H(X) _FP_FRAC_HIGH_1 (X)
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#define _FP_FRAC_HIGH_RAW_H(X) _FP_FRAC_HIGH_1 (X)
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#define _FP_FRAC_HIGH_DW_H(X) _FP_FRAC_HIGH_1 (X)
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#endif /* !SOFT_FP_HALF_H */
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