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soft-fp: Add brain format support

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In https://gcc.gnu.org/r13-3292 I've added brain format support
(std::bfloat16_t) on the GCC side, but as glibc has the master copy
of soft-fp, the following patch adds the files from that commit
and from https://gcc.gnu.org/r13-6598 and https://gcc.gnu.org/r13-6622
The files are not used by glibc right now.
This commit is contained in:
Jakub Jelinek 2024-02-01 16:58:49 +01:00
parent 83d8d289b2
commit 275607a07f
12 changed files with 738 additions and 0 deletions
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172
soft-fp/brain.h Normal file
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/* Software floating-point emulation.
Definitions for Brain Floating Point format (bfloat16).
Copyright (C) 1997-2024 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
<https://www.gnu.org/licenses/>. */
#ifndef SOFT_FP_BRAIN_H
#define SOFT_FP_BRAIN_H 1
#if _FP_W_TYPE_SIZE < 32
# error "Here's a nickel kid. Go buy yourself a real computer."
#endif
#define _FP_FRACTBITS_B (_FP_W_TYPE_SIZE)
#define _FP_FRACTBITS_DW_B (_FP_W_TYPE_SIZE)
#define _FP_FRACBITS_B 8
#define _FP_FRACXBITS_B (_FP_FRACTBITS_B - _FP_FRACBITS_B)
#define _FP_WFRACBITS_B (_FP_WORKBITS + _FP_FRACBITS_B)
#define _FP_WFRACXBITS_B (_FP_FRACTBITS_B - _FP_WFRACBITS_B)
#define _FP_EXPBITS_B 8
#define _FP_EXPBIAS_B 127
#define _FP_EXPMAX_B 255
#define _FP_QNANBIT_B ((_FP_W_TYPE) 1 << (_FP_FRACBITS_B-2))
#define _FP_QNANBIT_SH_B ((_FP_W_TYPE) 1 << (_FP_FRACBITS_B-2+_FP_WORKBITS))
#define _FP_IMPLBIT_B ((_FP_W_TYPE) 1 << (_FP_FRACBITS_B-1))
#define _FP_IMPLBIT_SH_B ((_FP_W_TYPE) 1 << (_FP_FRACBITS_B-1+_FP_WORKBITS))
#define _FP_OVERFLOW_B ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_B))
#define _FP_WFRACBITS_DW_B (2 * _FP_WFRACBITS_B)
#define _FP_WFRACXBITS_DW_B (_FP_FRACTBITS_DW_B - _FP_WFRACBITS_DW_B)
#define _FP_HIGHBIT_DW_B \
((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_B - 1) % _FP_W_TYPE_SIZE)
/* The implementation of _FP_MUL_MEAT_B and _FP_DIV_MEAT_B should be
chosen by the target machine. */
typedef float BFtype __attribute__ ((mode (BF)));
union _FP_UNION_B
{
BFtype flt;
struct _FP_STRUCT_LAYOUT
{
#if __BYTE_ORDER == __BIG_ENDIAN
unsigned sign : 1;
unsigned exp : _FP_EXPBITS_B;
unsigned frac : _FP_FRACBITS_B - (_FP_IMPLBIT_B != 0);
#else
unsigned frac : _FP_FRACBITS_B - (_FP_IMPLBIT_B != 0);
unsigned exp : _FP_EXPBITS_B;
unsigned sign : 1;
#endif
} bits;
};
#define FP_DECL_B(X) _FP_DECL (1, X)
#define FP_UNPACK_RAW_B(X, val) _FP_UNPACK_RAW_1 (B, X, (val))
#define FP_UNPACK_RAW_BP(X, val) _FP_UNPACK_RAW_1_P (B, X, (val))
#define FP_PACK_RAW_B(val, X) _FP_PACK_RAW_1 (B, (val), X)
#define FP_PACK_RAW_BP(val, X) \
do \
{ \
if (!FP_INHIBIT_RESULTS) \
_FP_PACK_RAW_1_P (B, (val), X); \
} \
while (0)
#define FP_UNPACK_B(X, val) \
do \
{ \
_FP_UNPACK_RAW_1 (B, X, (val)); \
_FP_UNPACK_CANONICAL (B, 1, X); \
} \
while (0)
#define FP_UNPACK_BP(X, val) \
do \
{ \
_FP_UNPACK_RAW_1_P (B, X, (val)); \
_FP_UNPACK_CANONICAL (B, 1, X); \
} \
while (0)
#define FP_UNPACK_SEMIRAW_B(X, val) \
do \
{ \
_FP_UNPACK_RAW_1 (B, X, (val)); \
_FP_UNPACK_SEMIRAW (B, 1, X); \
} \
while (0)
#define FP_UNPACK_SEMIRAW_BP(X, val) \
do \
{ \
_FP_UNPACK_RAW_1_P (B, X, (val)); \
_FP_UNPACK_SEMIRAW (B, 1, X); \
} \
while (0)
#define FP_PACK_B(val, X) \
do \
{ \
_FP_PACK_CANONICAL (B, 1, X); \
_FP_PACK_RAW_1 (B, (val), X); \
} \
while (0)
#define FP_PACK_BP(val, X) \
do \
{ \
_FP_PACK_CANONICAL (B, 1, X); \
if (!FP_INHIBIT_RESULTS) \
_FP_PACK_RAW_1_P (B, (val), X); \
} \
while (0)
#define FP_PACK_SEMIRAW_B(val, X) \
do \
{ \
_FP_PACK_SEMIRAW (B, 1, X); \
_FP_PACK_RAW_1 (B, (val), X); \
} \
while (0)
#define FP_PACK_SEMIRAW_BP(val, X) \
do \
{ \
_FP_PACK_SEMIRAW (B, 1, X); \
if (!FP_INHIBIT_RESULTS) \
_FP_PACK_RAW_1_P (B, (val), X); \
} \
while (0)
#define FP_TO_INT_B(r, X, rsz, rsg) _FP_TO_INT (B, 1, (r), X, (rsz), (rsg))
#define FP_TO_INT_ROUND_B(r, X, rsz, rsg) \
_FP_TO_INT_ROUND (B, 1, (r), X, (rsz), (rsg))
#define FP_FROM_INT_B(X, r, rs, rt) _FP_FROM_INT (B, 1, X, (r), (rs), rt)
/* BFmode arithmetic is not implemented. */
#define _FP_FRAC_HIGH_B(X) _FP_FRAC_HIGH_1 (X)
#define _FP_FRAC_HIGH_RAW_B(X) _FP_FRAC_HIGH_1 (X)
#define _FP_FRAC_HIGH_DW_B(X) _FP_FRAC_HIGH_1 (X)
#define FP_CMP_EQ_B(r, X, Y, ex) _FP_CMP_EQ (B, 1, (r), X, Y, (ex))
#endif /* !SOFT_FP_BRAIN_H */

49
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/* Software floating-point emulation.
Return an bfloat16 converted to IEEE single
Copyright (C) 2022-2024 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 "brain.h"
#include "single.h"
SFtype
__extendbfsf2 (BFtype a)
{
FP_DECL_EX;
FP_DECL_B (A);
FP_DECL_S (R);
SFtype r;
FP_INIT_EXCEPTIONS;
FP_UNPACK_RAW_B (A, a);
FP_EXTEND (S, B, 1, 1, R, A);
FP_PACK_RAW_S (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

45
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/* Software floating-point emulation.
Convert a 64bit signed integer to bfloat16
Copyright (C) 2007-2024 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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "brain.h"
BFtype
__floatdibf (DItype i)
{
FP_DECL_EX;
FP_DECL_B (A);
BFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_B (A, i, DI_BITS, UDItype);
FP_PACK_RAW_B (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}

45
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/* Software floating-point emulation.
Convert a 128bit signed integer to bfloat16
Copyright (C) 2007-2024 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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "brain.h"
BFtype
__floattibf (TItype i)
{
FP_DECL_EX;
FP_DECL_B (A);
BFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_B (A, i, TI_BITS, UTItype);
FP_PACK_RAW_B (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}

45
soft-fp/floatundibf.c Normal file
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/* Software floating-point emulation.
Convert a 64bit unsigned integer to bfloat16
Copyright (C) 2007-2024 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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "brain.h"
BFtype
__floatundibf (UDItype i)
{
FP_DECL_EX;
FP_DECL_B (A);
BFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_B (A, i, DI_BITS, UDItype);
FP_PACK_RAW_B (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}

45
soft-fp/floatuntibf.c Normal file
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/* Software floating-point emulation.
Convert a 128bit unsigned integer to bfloat16
Copyright (C) 2007-2024 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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "brain.h"
BFtype
__floatuntibf (UTItype i)
{
FP_DECL_EX;
FP_DECL_B (A);
BFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_B (A, i, TI_BITS, UTItype);
FP_PACK_RAW_B (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}

75
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/* Software floating-point emulation.
Truncate bfloat16 into IEEE half.
Copyright (C) 2022-2024 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 "brain.h"
#include "single.h"
/* BFtype and HFtype are unordered, neither is a superset or subset
of each other. Convert BFtype to SFtype (lossless) and then
truncate to HFtype. */
HFtype
__truncbfhf2 (BFtype a)
{
FP_DECL_EX;
FP_DECL_H (A);
FP_DECL_S (B);
FP_DECL_B (R);
SFtype b;
HFtype r;
FP_INIT_ROUNDMODE;
/* Optimize BFtype to SFtype conversion to simple left shift
by 16 if possible, we don't need to raise exceptions on sNaN
here as the SFtype to HFtype truncation should do that too. */
if (sizeof (BFtype) == 2
&& sizeof (unsigned short) == 2
&& sizeof (SFtype) == 4
&& sizeof (unsigned int) == 4)
{
union { BFtype a; unsigned short b; } u1;
union { SFtype a; unsigned int b; } u2;
u1.a = a;
u2.b = (u1.b << 8) << 8;
b = u2.a;
}
else
{
FP_UNPACK_RAW_B (A, a);
FP_EXTEND (S, B, 1, 1, B, A);
FP_PACK_RAW_S (b, B);
}
FP_UNPACK_SEMIRAW_S (B, b);
FP_TRUNC (H, S, 1, 1, R, B);
FP_PACK_SEMIRAW_H (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

52
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/* Software floating-point emulation.
Truncate IEEE double into bfloat16.
Copyright (C) 2022-2024 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 "brain.h"
#include "double.h"
BFtype
__truncdfbf2 (DFtype a)
{
FP_DECL_EX;
FP_DECL_D (A);
FP_DECL_B (R);
BFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_SEMIRAW_D (A, a);
#if _FP_W_TYPE_SIZE < _FP_FRACBITS_D
FP_TRUNC (B, D, 1, 2, R, A);
#else
FP_TRUNC (B, D, 1, 1, R, A);
#endif
FP_PACK_SEMIRAW_B (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

58
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/* Software floating-point emulation.
Truncate IEEE half into bfloat16.
Copyright (C) 2022-2024 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 "brain.h"
#include "half.h"
#include "single.h"
/* BFtype and HFtype are unordered, neither is a superset or subset
of each other. Convert HFtype to SFtype (lossless) and then
truncate to BFtype. */
BFtype
__trunchfbf2 (HFtype a)
{
FP_DECL_EX;
FP_DECL_H (A);
FP_DECL_S (B);
FP_DECL_B (R);
SFtype b;
BFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_RAW_H (A, a);
FP_EXTEND (S, H, 1, 1, B, A);
FP_PACK_RAW_S (b, B);
FP_UNPACK_SEMIRAW_S (B, b);
FP_TRUNC (B, S, 1, 1, R, B);
FP_PACK_SEMIRAW_B (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

48
soft-fp/truncsfbf2.c Normal file
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/* Software floating-point emulation.
Truncate IEEE single into bfloat16.
Copyright (C) 2022-2024 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 "brain.h"
#include "single.h"
BFtype
__truncsfbf2 (SFtype a)
{
FP_DECL_EX;
FP_DECL_S (A);
FP_DECL_B (R);
BFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_SEMIRAW_S (A, a);
FP_TRUNC (B, S, 1, 1, R, A);
FP_PACK_SEMIRAW_B (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

52
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/* Software floating-point emulation.
Truncate IEEE quad into bfloat16.
Copyright (C) 2022-2024 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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "brain.h"
#include "quad.h"
BFtype
__trunctfbf2 (TFtype a)
{
FP_DECL_EX;
FP_DECL_Q (A);
FP_DECL_B (R);
BFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_SEMIRAW_Q (A, a);
#if _FP_W_TYPE_SIZE < 64
FP_TRUNC (B, Q, 1, 4, R, A);
#else
FP_TRUNC (B, Q, 1, 2, R, A);
#endif
FP_PACK_SEMIRAW_B (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}

52
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/* Software floating-point emulation.
Truncate IEEE extended into bfloat16.
Copyright (C) 2022-2024 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 "brain.h"
#include "extended.h"
BFtype
__truncxfbf2 (XFtype a)
{
FP_DECL_EX;
FP_DECL_E (A);
FP_DECL_B (R);
BFtype r;
FP_INIT_ROUNDMODE;
FP_UNPACK_SEMIRAW_E (A, a);
#if _FP_W_TYPE_SIZE < 64
FP_TRUNC (B, E, 1, 4, R, A);
#else
FP_TRUNC (B, E, 1, 2, R, A);
#endif
FP_PACK_SEMIRAW_B (r, R);
FP_HANDLE_EXCEPTIONS;
return r;
}