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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/riscv/gen/flt_rounds.c
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/*-

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 * Copyright (c) 2015-2016 Ruslan Bukin <[email protected]>

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 * All rights reserved.

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 *

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 * Portions of this software were developed by SRI International and the

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 * University of Cambridge Computer Laboratory under DARPA/AFRL contract

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 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.

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 *

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 * Portions of this software were developed by the University of Cambridge

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 * Computer Laboratory as part of the CTSRD Project, with support from the

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 * UK Higher Education Innovation Fund (HEIF).

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 *

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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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 * 1. 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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 * 2. 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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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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#include <sys/types.h>

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#include <fenv.h>

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#include <float.h>

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int

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__flt_rounds(void)

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{

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	uint64_t mode;

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	__asm __volatile("csrr %0, fcsr" : "=r" (mode));

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	switch (mode & _ROUND_MASK) {

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	case FE_TOWARDZERO:

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		return (0);

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	case FE_TONEAREST:

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		return (1);

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	case FE_UPWARD:

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		return (2);

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	case FE_DOWNWARD:

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		return (3);

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	}

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	return (-1);

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}

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