1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #define __fenv_static 32 #include "fenv.h" 33 #ifdef __SPE__ 34 #include <sys/types.h> 35 #include <machine/spr.h> 36 #endif 37 38 #ifdef __GNUC_GNU_INLINE__ 39 #error "This file must be compiled with C99 'inline' semantics" 40 #endif 41 42 #ifdef __SPE__ 43 const fenv_t __fe_dfl_env = SPEFSCR_DFLT; 44 #else 45 const fenv_t __fe_dfl_env = 0x00000000; 46 #endif 47 48 extern inline int feclearexcept(int __excepts); 49 extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts); 50 extern inline int fesetexceptflag(const fexcept_t *__flagp, int __excepts); 51 #ifndef __SPE__ 52 extern inline int feraiseexcept(int __excepts); 53 #endif 54 extern inline int fetestexcept(int __excepts); 55 extern inline int fegetround(void); 56 extern inline int fesetround(int __round); 57 extern inline int fegetenv(fenv_t *__envp); 58 extern inline int feholdexcept(fenv_t *__envp); 59 extern inline int fesetenv(const fenv_t *__envp); 60 extern inline int feupdateenv(const fenv_t *__envp); 61 62 #ifdef __SPE__ 63 #define PMAX 0x7f7fffff 64 #define PMIN 0x00800000 65 int feraiseexcept(int __excepts) 66 { 67 uint32_t spefscr; 68 69 spefscr = mfspr(SPR_SPEFSCR); 70 mtspr(SPR_SPEFSCR, spefscr | (__excepts & FE_ALL_EXCEPT)); 71 72 if (__excepts & FE_INVALID) 73 __asm __volatile ("efsdiv %0, %0, %1" :: "r"(0), "r"(0)); 74 if (__excepts & FE_DIVBYZERO) 75 __asm __volatile ("efsdiv %0, %0, %1" :: "r"(1.0f), "r"(0)); 76 if (__excepts & FE_UNDERFLOW) 77 __asm __volatile ("efsmul %0, %0, %0" :: "r"(PMIN)); 78 if (__excepts & FE_OVERFLOW) 79 __asm __volatile ("efsadd %0, %0, %0" :: "r"(PMAX)); 80 if (__excepts & FE_INEXACT) 81 __asm __volatile ("efssub %0, %0, %1" :: "r"(PMIN), "r"(1.0f)); 82 return (0); 83 } 84 #endif 85