d54add422b
dynamic rounding modes, but FPUless chips that use softfloat can support it because everything is emulated anyway. (We presently have incomplete support for hardware FPUs.) Submitted by: Ian Lepore
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*-
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* Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org>
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* All rights reserved.
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <fenv.h>
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#include <float.h>
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#include "softfloat.h"
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int
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__flt_rounds(void)
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{
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#ifndef ARM_HARD_FLOAT
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/*
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* Translate our rounding modes to the unnamed
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* manifest constants required by C99 et. al.
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*/
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switch (__softfloat_float_rounding_mode) {
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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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#else /* ARM_HARD_FLOAT */
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/*
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* Apparently, the rounding mode is specified as part of the
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* instruction format on ARM, so the dynamic rounding mode is
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* indeterminate. Some FPUs may differ.
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*/
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return (-1);
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#endif /* ARM_HARD_FLOAT */
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}
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