294 lines
6.2 KiB
C
294 lines
6.2 KiB
C
/* $NetBSD: fenv.h,v 1.2 2016/08/25 12:29:14 christos Exp $ */
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/*-
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* Copyright (c) 2016 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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#ifndef _SH3_FENV_H_
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#define _SH3_FENV_H_
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#include <sys/stdint.h>
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#include <sh3/float.h>
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#include <sh3/fpreg.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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/* Exception bits, from FPSCR */
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#define FE_INEXACT ((uint32_t)FPSCR_EXCEPTION_INEXACT >> 5)
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#define FE_DIVBYZERO ((uint32_t)FPSCR_EXCEPTION_ZERODIV >> 5)
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#define FE_UNDERFLOW ((uint32_t)FPSCR_EXCEPTION_UNDERFLOW >> 5)
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#define FE_OVERFLOW ((uint32_t)FPSCR_EXCEPTION_OVERFLOW >> 5)
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#define FE_INVALID ((uint32_t)FPSCR_EXCEPTION_INVALID >> 5)
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#define FE_ALL_EXCEPT \
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(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
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/* Rounding modes, from FPSCR */
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#define FE_TONEAREST FPSCR_ROUND_NEAREST
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#define FE_TOWARDZERO FPSCR_ROUND_ZERO
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/* These two don't exist and are only defined for the benefit of softfloat */
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#define FE_DOWNWARD (FPSCR_ROUND_ZERO + 1)
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#define FE_UPWARD (FPSCR_ROUND_ZERO + 2)
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#define _ROUND_MASK \
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(FE_TONEAREST | FE_TOWARDZERO)
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typedef uint32_t fexcept_t;
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typedef struct {
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uint32_t __fpscr;
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} fenv_t;
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#define FE_DFL_ENV ((fenv_t *) -1)
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#define __get_fpscr(__fpscr) \
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__asm__ __volatile__ ("sts fpscr,%0" : "=r" (__fpscr))
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#define __set_fpscr(__fpscr) \
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__asm__ __volatile__ ("lds %0,fpscr" : : "r" (__fpscr))
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__BEGIN_DECLS
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__fenv_static inline int
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feclearexcept(int __excepts)
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{
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fexcept_t __fpscr;
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__excepts &= FE_ALL_EXCEPT;
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__get_fpscr(__fpscr);
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__fpscr &= ~__excepts;
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__set_fpscr(__fpscr);
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return 0;
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}
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__fenv_static inline int
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fegetexceptflag(fexcept_t *__flagp, int __excepts)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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*__flagp = __fpscr & __excepts & FE_ALL_EXCEPT;
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return 0;
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}
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__fenv_static inline int
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fesetexceptflag(const fexcept_t *__flagp, int __excepts)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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__fpscr &= ~(__excepts & FE_ALL_EXCEPT);
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__fpscr |= *__flagp & __excepts & FE_ALL_EXCEPT;
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__set_fpscr(__fpscr);
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return 0;
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}
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static inline void
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__fmul(double a, double b)
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{
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#ifdef __sh4__
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__asm__ __volatile__ ("fmul %1, %0" : "+d" (a) : "d" (b));
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#endif
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}
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static inline void
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__fdiv(double a, double b) {
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#ifdef __sh4__
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__asm__ __volatile__ ("fdiv %1, %0" : "+d" (a) : "d" (b));
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#endif
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}
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__fenv_static inline int
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feraiseexcept(int __excepts)
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{
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fexcept_t __fpscr;
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if (__excepts & FE_INVALID) /* Inf * 0 */
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__fmul(__builtin_huge_val(), 0.0);
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if (__excepts & FE_DIVBYZERO) /* 1.0 / 0 */
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__fdiv(1.0, 0.0);
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if (__excepts & FE_OVERFLOW) /* MAX * MAX */
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__fmul(LDBL_MAX, LDBL_MAX);
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if (__excepts & FE_UNDERFLOW) /* MIN / 10.0 */
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__fdiv(LDBL_MIN, 10.0);
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if (__excepts & FE_INEXACT) /* 1 / 3 */
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__fdiv(1.0, 3.0);
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__get_fpscr(__fpscr);
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__fpscr |= __excepts & FE_ALL_EXCEPT;
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__set_fpscr(__fpscr);
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return 0;
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}
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__fenv_static inline int
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fetestexcept(int __excepts)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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return __fpscr & __excepts & FE_ALL_EXCEPT;
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}
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__fenv_static inline int
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fegetround(void)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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return __fpscr & _ROUND_MASK;
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}
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__fenv_static inline int
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fesetround(int __round)
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{
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fexcept_t __fpscr;
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if (__round & ~_ROUND_MASK)
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return -1;
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__get_fpscr(__fpscr);
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__fpscr &= ~_ROUND_MASK;
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__fpscr |= __round;
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__set_fpscr(__fpscr);
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return 0;
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}
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__fenv_static inline int
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fegetenv(fenv_t *__envp)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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__envp->__fpscr = __fpscr;
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return 0;
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}
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__fenv_static inline int
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feholdexcept(fenv_t *__envp)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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__envp->__fpscr = __fpscr;
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__fpscr &= ~FE_ALL_EXCEPT;
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__fpscr &= ~(FE_ALL_EXCEPT << 5);
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__set_fpscr(__fpscr); /* clear all */
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return 0;
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}
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__fenv_static inline int
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fesetenv(const fenv_t *__envp)
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{
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if (__envp == FE_DFL_ENV)
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__set_fpscr(FPSCR_DEFAULT);
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else
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__set_fpscr(__envp->__fpscr);
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return 0;
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}
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__fenv_static inline int
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feupdateenv(const fenv_t *__envp)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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__fpscr &= FE_ALL_EXCEPT;
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fesetenv(__envp);
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feraiseexcept((int)__fpscr);
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return 0;
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}
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#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
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/* We currently provide no external definitions of the functions below. */
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static inline int
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feenableexcept(int __mask)
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{
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fexcept_t __fpscr, __oldmask;
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__get_fpscr(__fpscr);
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__oldmask = (__fpscr >> 5) & FE_ALL_EXCEPT;
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__fpscr |= (__mask & FE_ALL_EXCEPT) << 5;
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__set_fpscr(__fpscr);
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return __oldmask;
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}
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static inline int
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fedisableexcept(int __mask)
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{
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fexcept_t __fpscr, __oldmask;
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__get_fpscr(__fpscr);
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__oldmask = (__fpscr >> 5) & FE_ALL_EXCEPT;
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__fpscr &= ~(__mask & FE_ALL_EXCEPT) << 5;
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__set_fpscr(__fpscr);
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return __oldmask;
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}
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static inline int
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fegetexcept(void)
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{
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fexcept_t __fpscr;
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__get_fpscr(__fpscr);
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return (__fpscr >> 5) & FE_ALL_EXCEPT;
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}
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#endif /* _NETBSD_SOURCE || _GNU_SOURCE */
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__END_DECLS
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#endif /* _SH3_FENV_H_ */
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