mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
275607a07f
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.
173 lines
5.2 KiB
C
173 lines
5.2 KiB
C
/* 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 */
|