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