133 lines
4.1 KiB
C
133 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.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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* $FreeBSD$
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*/
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#ifndef _SYS_FENV_H_
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#define _SYS_FENV_H_
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#include <sys/_types.h>
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#include <machine/endian.h>
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#ifndef __fenv_static
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#define __fenv_static static
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef int fenv_t;
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typedef int fexcept_t;
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/* Exception flags */
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#define FE_INEXACT 0x02000000
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#define FE_DIVBYZERO 0x04000000
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#define FE_UNDERFLOW 0x08000000
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#define FE_OVERFLOW 0x10000000
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#define FE_INVALID 0x20000000 /* all types of invalid FP ops */
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/*
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* The PowerPC architecture has extra invalid flags that indicate the
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* specific type of invalid operation occurred. These flags may be
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* tested, set, and cleared---but not masked---separately. All of
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* these bits are cleared when FE_INVALID is cleared, but only
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* FE_VXSOFT is set when FE_INVALID is explicitly set in software.
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*/
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#define FE_VXCVI 0x00000100 /* invalid integer convert */
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#define FE_VXSQRT 0x00000200 /* square root of a negative */
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#define FE_VXSOFT 0x00000400 /* software-requested exception */
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#define FE_VXVC 0x00080000 /* ordered comparison involving NaN */
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#define FE_VXIMZ 0x00100000 /* inf * 0 */
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#define FE_VXZDZ 0x00200000 /* 0 / 0 */
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#define FE_VXIDI 0x00400000 /* inf / inf */
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#define FE_VXISI 0x00800000 /* inf - inf */
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#define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */
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#define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \
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FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \
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FE_VXSNAN | FE_INVALID)
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#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
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FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
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/* Rounding modes */
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#define FE_TONEAREST 0x0000
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#define FE_TOWARDZERO 0x0001
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#define FE_UPWARD 0x0002
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#define FE_DOWNWARD 0x0003
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#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
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FE_UPWARD | FE_TOWARDZERO)
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/* Default floating-point environment */
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extern const fenv_t *_fe_dfl_env;
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#define FE_DFL_ENV (_fe_dfl_env)
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/* We need to be able to map status flag positions to mask flag positions */
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#define _FPUSW_SHIFT 22
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#define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
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FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT)
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#ifndef _SOFT_FLOAT
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#ifdef __SPE__
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#define __mffs(__env) \
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__asm __volatile("mfspr %0, 512" : "=r" ((__env)->__bits.__reg))
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#define __mtfsf(__env) \
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__asm __volatile("mtspr 512,%0;isync" :: "r" ((__env).__bits.__reg))
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#else
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#define __mffs(__env) \
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__asm __volatile("mffs %0" : "=f" ((__env)->__d))
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#define __mtfsf(__env) \
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__asm __volatile("mtfsf 255,%0" :: "f" ((__env).__d))
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#endif
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#else
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#define __mffs(__env)
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#define __mtfsf(__env)
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#endif
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union __fpscr {
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double __d;
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struct {
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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fenv_t __reg;
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__uint32_t __junk;
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#else
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__uint32_t __junk;
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fenv_t __reg;
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#endif
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} __bits;
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* !_SYS_FENV_H_ */
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