77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
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/*
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(c) Copyright 2017 Michael R. Neilly
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <fenv.h>
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/* This implementation is intended to comply with the following
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* specification:
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*
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* http://pubs.opengroup.org/onlinepubs/009695399/functions/fegetexceptflag.html
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* Referred to as 'fegetexceptflag.html below.
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*
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* "The fegetexceptflag() function shall attempt to store an
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* implementation-defined representation of the states of the
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* floating-point status flags indicated by the argument excepts in
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* the object pointed to by the argument flagp."
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*/
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int fegetexceptflag(fexcept_t *flagp, int excepts)
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{
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#if __riscv_flen
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/* Mask excepts to be sure only supported flag bits are set */
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excepts &= FE_ALL_EXCEPT;
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/* Get current exception flags */
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fexcept_t flags;
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asm volatile("frflags %0" : "=r"(flags));
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/* Return the requested flags in flagp */
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*flagp = flags & excepts;
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/* Per 'fegetexceptflag.html:
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*
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* "If the representation was successfully stored, fegetexceptflag()
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* shall return zero. Otherwise, it shall return a non-zero
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* value."
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*/
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#endif
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return 0;
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}
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