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In order to facilitate the fine-tuning of how `libatomic_i.h' and `host-config.h' headers are used by different atomic functions, we define distinct identifier macros for each file which, in implementing atomic operations, imports these headers. The idea is that different parts of these headers could then be conditionally defined depending on the macros set by the file that `#include'd them. Given how it is possible that some file names are generic enough that using them as-is for macro names (e.g. flag.c -> FLAG) may potentially lead to name clashes with other macros, all file names first have LAT_ prepended to them such that, for example, flag.c is assigned the LAT_FLAG macro. Libatomic/ChangeLog: * cas_n.c (LAT_CAS_N): New. * exch_n.c (LAT_EXCH_N): Likewise. * fadd_n.c (LAT_FADD_N): Likewise. * fand_n.c (LAT_FAND_N): Likewise. * fence.c (LAT_FENCE): Likewise. * fenv.c (LAT_FENV): Likewise. * fior_n.c (LAT_FIOR_N): Likewise. * flag.c (LAT_FLAG): Likewise. * fnand_n.c (LAT_FNAND_N): Likewise. * fop_n.c (LAT_FOP_N): Likewise * fsub_n.c (LAT_FSUB_N): Likewise. * fxor_n.c (LAT_FXOR_N): Likewise. * gcas.c (LAT_GCAS): Likewise. * gexch.c (LAT_GEXCH): Likewise. * glfree.c (LAT_GLFREE): Likewise. * gload.c (LAT_GLOAD): Likewise. * gstore.c (LAT_GSTORE): Likewise. * load_n.c (LAT_LOAD_N): Likewise. * store_n.c (LAT_STORE_N): Likewise. * tas_n.c (LAT_TAS_N): Likewise.
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/* Copyright (C) 2012-2024 Free Software Foundation, Inc.
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This file is part of the GNU Atomic Library (libatomic).
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Libatomic is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#define LAT_FENV
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#include "libatomic_i.h"
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#ifdef HAVE_FENV_H
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# include <fenv.h>
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#endif
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/* Raise the supported floating-point exceptions from EXCEPTS. Other
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bits in EXCEPTS are ignored. */
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void
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__atomic_feraiseexcept (int excepts __attribute__ ((unused)))
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{
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volatile float r __attribute__ ((unused));
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#ifdef FE_INVALID
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if (excepts & FE_INVALID)
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{
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volatile float zero = 0.0f;
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r = zero / zero;
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}
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#endif
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#ifdef FE_DIVBYZERO
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if (excepts & FE_DIVBYZERO)
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{
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volatile float zero = 0.0f;
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r = 1.0f / zero;
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}
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#endif
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#ifdef FE_OVERFLOW
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if (excepts & FE_OVERFLOW)
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{
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volatile float max = __FLT_MAX__;
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r = max * max;
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}
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#endif
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#ifdef FE_UNDERFLOW
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if (excepts & FE_UNDERFLOW)
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{
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volatile float min = __FLT_MIN__;
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r = min * min;
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}
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#endif
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#ifdef FE_INEXACT
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if (excepts & FE_INEXACT)
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{
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volatile float three = 3.0f;
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r = 1.0f / three;
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}
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#endif
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}
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#undef LAT_FENV
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