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6ec6c77867
1. Add __extendhfdf2/__extendhfsf2 to return an IEEE half converted to IEEE double/single. 2. Add __truncdfhf2/__extendsfhf2 to truncate IEEE double/single into IEEE half. 3. Add __eqhf2/__nehf2 to return 0 if a == b and a,b are not NAN, otherwise return 1. These are needed by x86 _Float16: https://software.intel.com/content/www/us/en/develop/download/intel-avx512-fp16-architecture-specification.html support in GCC.
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/* Software floating-point emulation.
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Truncate IEEE double into IEEE half.
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Copyright (C) 2021 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 "half.h"
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#include "double.h"
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HFtype
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__truncdfhf2 (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_H (R);
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HFtype 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 (H, D, 1, 2, R, A);
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#else
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FP_TRUNC (H, D, 1, 1, R, A);
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#endif
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FP_PACK_SEMIRAW_H (r, R);
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FP_HANDLE_EXCEPTIONS;
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return r;
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}
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