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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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52
soft-fp/truncdfbf2.c Normal file
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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;
}