/* $NetBSD: fenv.h,v 1.4 2024/10/30 15:56:12 riastradh Exp $ */ /*- * Copyright (c) 2016 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Christos Zoulas. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _SH3_FENV_H_ #define _SH3_FENV_H_ #include #include #include #include #ifndef __fenv_static #define __fenv_static static #endif /* Exception bits, from FPSCR */ #define FE_INEXACT ((uint32_t)FPSCR_EXCEPTION_INEXACT >> 5) #define FE_DIVBYZERO ((uint32_t)FPSCR_EXCEPTION_ZERODIV >> 5) #define FE_UNDERFLOW ((uint32_t)FPSCR_EXCEPTION_UNDERFLOW >> 5) #define FE_OVERFLOW ((uint32_t)FPSCR_EXCEPTION_OVERFLOW >> 5) #define FE_INVALID ((uint32_t)FPSCR_EXCEPTION_INVALID >> 5) #define FE_ALL_EXCEPT \ (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) /* Rounding modes, from FPSCR */ #define FE_TONEAREST FPSCR_ROUND_NEAREST #define FE_TOWARDZERO FPSCR_ROUND_ZERO /* These two don't exist and are only defined for the benefit of softfloat */ #define FE_DOWNWARD (FPSCR_ROUND_ZERO + 1) #define FE_UPWARD (FPSCR_ROUND_ZERO + 2) #define _ROUND_MASK \ (FE_TONEAREST | FE_TOWARDZERO) #ifdef __SH_FPU_ANY__ typedef uint32_t fexcept_t; typedef struct { uint32_t __fpscr; } fenv_t; #define FE_DFL_ENV ((fenv_t *) -1) #define __get_fpscr(__fpscr) \ __asm__ __volatile__ ("sts fpscr,%0" : "=r" (__fpscr)) #define __set_fpscr(__fpscr) \ __asm__ __volatile__ ("lds %0,fpscr" : : "r" (__fpscr)) __BEGIN_DECLS __fenv_static inline int feclearexcept(int __excepts) { fexcept_t __fpscr; __excepts &= FE_ALL_EXCEPT; __get_fpscr(__fpscr); __fpscr &= ~__excepts; __set_fpscr(__fpscr); return 0; } __fenv_static inline int fegetexceptflag(fexcept_t *__flagp, int __excepts) { fexcept_t __fpscr; __get_fpscr(__fpscr); *__flagp = __fpscr & __excepts & FE_ALL_EXCEPT; return 0; } __fenv_static inline int fesetexceptflag(const fexcept_t *__flagp, int __excepts) { fexcept_t __fpscr; __get_fpscr(__fpscr); __fpscr &= ~(__excepts & FE_ALL_EXCEPT); __fpscr |= *__flagp & __excepts & FE_ALL_EXCEPT; __set_fpscr(__fpscr); return 0; } static inline void __fmul(double a, double b) { #ifdef __sh4__ __asm__ __volatile__ ("fmul %1, %0" : "+d" (a) : "d" (b)); #endif } static inline void __fdiv(double a, double b) { #ifdef __sh4__ __asm__ __volatile__ ("fdiv %1, %0" : "+d" (a) : "d" (b)); #endif } __fenv_static inline int feraiseexcept(int __excepts) { fexcept_t __fpscr; if (__excepts & FE_INVALID) /* Inf * 0 */ __fmul(__builtin_huge_val(), 0.0); if (__excepts & FE_DIVBYZERO) /* 1.0 / 0 */ __fdiv(1.0, 0.0); if (__excepts & FE_OVERFLOW) /* MAX * MAX */ __fmul(LDBL_MAX, LDBL_MAX); if (__excepts & FE_UNDERFLOW) /* MIN / 10.0 */ __fdiv(LDBL_MIN, 10.0); if (__excepts & FE_INEXACT) /* 1 / 3 */ __fdiv(1.0, 3.0); __get_fpscr(__fpscr); __fpscr |= __excepts & FE_ALL_EXCEPT; __set_fpscr(__fpscr); return 0; } __fenv_static inline int fetestexcept(int __excepts) { fexcept_t __fpscr; __get_fpscr(__fpscr); return __fpscr & __excepts & FE_ALL_EXCEPT; } __fenv_static inline int fegetround(void) { fexcept_t __fpscr; __get_fpscr(__fpscr); return __fpscr & _ROUND_MASK; } __fenv_static inline int fesetround(int __round) { fexcept_t __fpscr; if (__round & ~_ROUND_MASK) return -1; __get_fpscr(__fpscr); __fpscr &= ~_ROUND_MASK; __fpscr |= __round; __set_fpscr(__fpscr); return 0; } __fenv_static inline int fegetenv(fenv_t *__envp) { fexcept_t __fpscr; __get_fpscr(__fpscr); __envp->__fpscr = __fpscr; return 0; } __fenv_static inline int feholdexcept(fenv_t *__envp) { fexcept_t __fpscr; __get_fpscr(__fpscr); __envp->__fpscr = __fpscr; __fpscr &= ~FE_ALL_EXCEPT; __fpscr &= ~(FE_ALL_EXCEPT << 5); __set_fpscr(__fpscr); /* clear all */ return 0; } __fenv_static inline int fesetenv(const fenv_t *__envp) { if (__envp == FE_DFL_ENV) __set_fpscr(FPSCR_DEFAULT); else __set_fpscr(__envp->__fpscr); return 0; } __fenv_static inline int feupdateenv(const fenv_t *__envp) { fexcept_t __fpscr; __get_fpscr(__fpscr); __fpscr &= FE_ALL_EXCEPT; fesetenv(__envp); feraiseexcept((int)__fpscr); return 0; } #if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE) /* We currently provide no external definitions of the functions below. */ static inline int feenableexcept(int __mask) { fexcept_t __fpscr, __oldmask; __get_fpscr(__fpscr); __oldmask = (__fpscr >> 5) & FE_ALL_EXCEPT; __fpscr |= (__mask & FE_ALL_EXCEPT) << 5; __set_fpscr(__fpscr); return __oldmask; } static inline int fedisableexcept(int __mask) { fexcept_t __fpscr, __oldmask; __get_fpscr(__fpscr); __oldmask = (__fpscr >> 5) & FE_ALL_EXCEPT; __fpscr &= ~(__mask & FE_ALL_EXCEPT) << 5; __set_fpscr(__fpscr); return __oldmask; } static inline int fegetexcept(void) { fexcept_t __fpscr; __get_fpscr(__fpscr); return (__fpscr >> 5) & FE_ALL_EXCEPT; } #endif /* _NETBSD_SOURCE || _GNU_SOURCE */ __END_DECLS #endif /* __SH_FPU_ANY__ */ #endif /* _SH3_FENV_H_ */