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[soft-fp] Add support for various half-precision conversion routines.

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This patch adds conversion routines required for _Float16 support in
AArch64.

These are one-step conversions to and from TImode and TFmode. We need
these on AArch64 regardless of presence of the ARMv8.2-A 16-bit
floating-point extensions.

In the patch, soft-fp/half.h is derived from soft-fp/single.h .  The
conversion routines are derivatives of their respective SFmode
variants.

	* soft-fp/extendhftf2.c: New.
	* soft-fp/fixhfti.c: Likewise.
	* soft-fp/fixunshfti.c: Likewise.
	* soft-fp/floattihf.c: Likewise.
	* soft-fp/floatuntihf.c: Likewise.
	* soft-fp/half.h: Likewise.
	* soft-fp/trunctfhf2.c: Likewise.
This commit is contained in:
James Greenhalgh 2016-09-21 21:02:54 +00:00 committed by Joseph Myers
parent d942e95cd7
commit 87ab10d652
8 changed files with 465 additions and 0 deletions
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10
ChangeLog
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2016-09-21 James Greenhalgh <james.greenhalgh@arm.com>
* soft-fp/extendhftf2.c: New.
* soft-fp/fixhfti.c: Likewise.
* soft-fp/fixunshfti.c: Likewise.
* soft-fp/floattihf.c: Likewise.
* soft-fp/floatuntihf.c: Likewise.
* soft-fp/half.h: Likewise.
* soft-fp/trunctfhf2.c: Likewise.
2016-09-21 Joseph Myers <joseph@codesourcery.com>
* math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (issubnormal): New

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soft-fp/extendhftf2.c Normal file
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/* Software floating-point emulation.
Return an IEEE half converted to IEEE quad
Copyright (C) 1997-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#define FP_NO_EXACT_UNDERFLOW
#include "soft-fp.h"
#include "half.h"
#include "quad.h"
TFtype
__extendhftf2 (HFtype a)
{
FP_DECL_EX;
FP_DECL_H (A);
FP_DECL_Q (R);
TFtype r;
FP_INIT_EXCEPTIONS;
FP_UNPACK_RAW_H (A, a);
#if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
FP_EXTEND (Q, H, 4, 1, R, A);
#else
FP_EXTEND (Q, H, 2, 1, R, A);
#endif
FP_PACK_RAW_Q (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

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soft-fp/fixhfti.c Normal file
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/* Software floating-point emulation.
Convert IEEE half to 128bit signed integer
Copyright (C) 2007-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#include "soft-fp.h"
#include "half.h"
TItype
__fixhfti (HFtype a)
{
FP_DECL_EX;
FP_DECL_H (A);
UTItype r;
FP_INIT_EXCEPTIONS;
FP_UNPACK_RAW_H (A, a);
FP_TO_INT_H (r, A, TI_BITS, 1);
FP_HANDLE_EXCEPTIONS;
return r;
}

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soft-fp/fixunshfti.c Normal file
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/* Software floating-point emulation.
Convert IEEE half to 128bit unsigned integer
Copyright (C) 2007-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#include "soft-fp.h"
#include "half.h"
UTItype
__fixunshfti (HFtype a)
{
FP_DECL_EX;
FP_DECL_H (A);
UTItype r;
FP_INIT_EXCEPTIONS;
FP_UNPACK_RAW_H (A, a);
FP_TO_INT_H (r, A, TI_BITS, 0);
FP_HANDLE_EXCEPTIONS;
return r;
}

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soft-fp/floattihf.c Normal file
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/* Software floating-point emulation.
Convert a 128bit signed integer to IEEE half
Copyright (C) 2007-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#include "soft-fp.h"
#include "half.h"
HFtype
__floattihf (TItype i)
{
FP_DECL_EX;
FP_DECL_H (A);
HFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_H (A, i, TI_BITS, UTItype);
FP_PACK_RAW_H (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}

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soft-fp/floatuntihf.c Normal file
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/* Software floating-point emulation.
Convert a 128bit unsigned integer to IEEE half.
Copyright (C) 2007-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#include "soft-fp.h"
#include "half.h"
HFtype
__floatuntihf (UTItype i)
{
FP_DECL_EX;
FP_DECL_H (A);
HFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_H (A, i, TI_BITS, UTItype);
FP_PACK_RAW_H (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}

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soft-fp/half.h Normal file
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/* Software floating-point emulation.
Definitions for IEEE Half Precision.
Copyright (C) 1997-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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_HALF_H
#define SOFT_FP_HALF_H 1
#if _FP_W_TYPE_SIZE < 32
# error "Here's a nickel kid. Go buy yourself a real computer."
#endif
#define _FP_FRACTBITS_H (_FP_W_TYPE_SIZE)
#define _FP_FRACTBITS_DW_H (_FP_W_TYPE_SIZE)
#define _FP_FRACBITS_H 11
#define _FP_FRACXBITS_H (_FP_FRACTBITS_H - _FP_FRACBITS_H)
#define _FP_WFRACBITS_H (_FP_WORKBITS + _FP_FRACBITS_H)
#define _FP_WFRACXBITS_H (_FP_FRACTBITS_H - _FP_WFRACBITS_H)
#define _FP_EXPBITS_H 5
#define _FP_EXPBIAS_H 15
#define _FP_EXPMAX_H 31
#define _FP_QNANBIT_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-2))
#define _FP_QNANBIT_SH_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-2+_FP_WORKBITS))
#define _FP_IMPLBIT_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-1))
#define _FP_IMPLBIT_SH_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-1+_FP_WORKBITS))
#define _FP_OVERFLOW_H ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_H))
#define _FP_WFRACBITS_DW_H (2 * _FP_WFRACBITS_H)
#define _FP_WFRACXBITS_DW_H (_FP_FRACTBITS_DW_H - _FP_WFRACBITS_DW_H)
#define _FP_HIGHBIT_DW_H \
((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_H - 1) % _FP_W_TYPE_SIZE)
/* The implementation of _FP_MUL_MEAT_H and _FP_DIV_MEAT_H should be
chosen by the target machine. */
typedef float HFtype __attribute__ ((mode (HF)));
union _FP_UNION_H
{
HFtype flt;
struct _FP_STRUCT_LAYOUT
{
#if __BYTE_ORDER == __BIG_ENDIAN
unsigned sign : 1;
unsigned exp : _FP_EXPBITS_H;
unsigned frac : _FP_FRACBITS_H - (_FP_IMPLBIT_H != 0);
#else
unsigned frac : _FP_FRACBITS_H - (_FP_IMPLBIT_H != 0);
unsigned exp : _FP_EXPBITS_H;
unsigned sign : 1;
#endif
} bits __attribute__ ((packed));
};
#define FP_DECL_H(X) _FP_DECL (1, X)
#define FP_UNPACK_RAW_H(X, val) _FP_UNPACK_RAW_1 (H, X, (val))
#define FP_UNPACK_RAW_HP(X, val) _FP_UNPACK_RAW_1_P (H, X, (val))
#define FP_PACK_RAW_H(val, X) _FP_PACK_RAW_1 (H, (val), X)
#define FP_PACK_RAW_HP(val, X) \
do \
{ \
if (!FP_INHIBIT_RESULTS) \
_FP_PACK_RAW_1_P (H, (val), X); \
} \
while (0)
#define FP_UNPACK_H(X, val) \
do \
{ \
_FP_UNPACK_RAW_1 (H, X, (val)); \
_FP_UNPACK_CANONICAL (H, 1, X); \
} \
while (0)
#define FP_UNPACK_HP(X, val) \
do \
{ \
_FP_UNPACK_RAW_1_P (H, X, (val)); \
_FP_UNPACK_CANONICAL (H, 1, X); \
} \
while (0)
#define FP_UNPACK_SEMIRAW_H(X, val) \
do \
{ \
_FP_UNPACK_RAW_1 (H, X, (val)); \
_FP_UNPACK_SEMIRAW (H, 1, X); \
} \
while (0)
#define FP_UNPACK_SEMIRAW_HP(X, val) \
do \
{ \
_FP_UNPACK_RAW_1_P (H, X, (val)); \
_FP_UNPACK_SEMIRAW (H, 1, X); \
} \
while (0)
#define FP_PACK_H(val, X) \
do \
{ \
_FP_PACK_CANONICAL (H, 1, X); \
_FP_PACK_RAW_1 (H, (val), X); \
} \
while (0)
#define FP_PACK_HP(val, X) \
do \
{ \
_FP_PACK_CANONICAL (H, 1, X); \
if (!FP_INHIBIT_RESULTS) \
_FP_PACK_RAW_1_P (H, (val), X); \
} \
while (0)
#define FP_PACK_SEMIRAW_H(val, X) \
do \
{ \
_FP_PACK_SEMIRAW (H, 1, X); \
_FP_PACK_RAW_1 (H, (val), X); \
} \
while (0)
#define FP_PACK_SEMIRAW_HP(val, X) \
do \
{ \
_FP_PACK_SEMIRAW (H, 1, X); \
if (!FP_INHIBIT_RESULTS) \
_FP_PACK_RAW_1_P (H, (val), X); \
} \
while (0)
#define FP_TO_INT_H(r, X, rsz, rsg) _FP_TO_INT (H, 1, (r), X, (rsz), (rsg))
#define FP_TO_INT_ROUND_H(r, X, rsz, rsg) \
_FP_TO_INT_ROUND (H, 1, (r), X, (rsz), (rsg))
#define FP_FROM_INT_H(X, r, rs, rt) _FP_FROM_INT (H, 1, X, (r), (rs), rt)
/* HFmode arithmetic is not implemented. */
#define _FP_FRAC_HIGH_H(X) _FP_FRAC_HIGH_1 (X)
#define _FP_FRAC_HIGH_RAW_H(X) _FP_FRAC_HIGH_1 (X)
#define _FP_FRAC_HIGH_DW_H(X) _FP_FRAC_HIGH_1 (X)
#endif /* !SOFT_FP_HALF_H */

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/* Software floating-point emulation.
Truncate IEEE quad into IEEE half.
Copyright (C) 1997-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#include "soft-fp.h"
#include "half.h"
#include "quad.h"
HFtype
__trunctfhf2 (TFtype a)
{
FP_DECL_EX;
FP_DECL_Q (A);
FP_DECL_H (R);
HFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_SEMIRAW_Q (A, a);
#if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
FP_TRUNC (H, Q, 1, 4, R, A);
#else
FP_TRUNC (H, Q, 1, 2, R, A);
#endif
FP_PACK_SEMIRAW_H (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}