1 /* Floating point environment. C-SKY version. 2 Copyright (C) 2018-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _FENV_H 20 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." 21 #endif 22 23 #ifdef __csky_hard_float__ 24 /* Define bits representing the exception. We use the bit positions 25 of the appropriate bits in the FPU control word. */ 26 enum 27 { 28 FE_INVALID = 29 #define FE_INVALID 0x01 30 FE_INVALID, 31 FE_DIVBYZERO = 32 #define FE_DIVBYZERO 0x02 33 FE_DIVBYZERO, 34 FE_OVERFLOW = 35 #define FE_OVERFLOW 0x04 36 FE_OVERFLOW, 37 FE_UNDERFLOW = 38 #define FE_UNDERFLOW 0x08 39 FE_UNDERFLOW, 40 FE_INEXACT = 41 #define FE_INEXACT 0x10 42 FE_INEXACT, 43 __FE_DENORMAL = 0x20 44 }; 45 46 #define FE_ALL_EXCEPT \ 47 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 48 49 /* The C-SKY FPU supports all of the four defined rounding modes. We 50 use again the bit positions in the FPU control word as the values 51 for the appropriate macros. */ 52 enum 53 { 54 FE_TONEAREST = 55 #define FE_TONEAREST (0x0 << 24) 56 FE_TONEAREST, 57 FE_TOWARDZERO = 58 #define FE_TOWARDZERO (0x1 << 24) 59 FE_TOWARDZERO, 60 FE_UPWARD = 61 #define FE_UPWARD (0x2 << 24) 62 FE_UPWARD, 63 FE_DOWNWARD = 64 #define FE_DOWNWARD (0x3 << 24) 65 FE_DOWNWARD, 66 __FE_ROUND_MASK = (0x3 << 24) 67 }; 68 69 #else 70 71 /* In the soft-float case, only rounding to nearest is supported, with 72 no exceptions. */ 73 74 enum 75 { 76 __FE_UNDEFINED = -1, 77 78 FE_TONEAREST = 79 # define FE_TONEAREST 0x0 80 FE_TONEAREST 81 }; 82 83 # define FE_ALL_EXCEPT 0 84 85 #endif 86 87 /* Type representing exception flags. */ 88 typedef unsigned int fexcept_t; 89 90 /* Type representing floating-point environment. */ 91 typedef struct 92 { 93 unsigned int __fpcr; 94 unsigned int __fpsr; 95 } fenv_t; 96 97 /* If the default argument is used we use this value. */ 98 #define FE_DFL_ENV ((const fenv_t *) -1) 99 100 #if defined __USE_GNU && defined __csky_hard_float__ 101 /* Floating-point environment where none of the exceptions are masked. */ 102 # define FE_NOMASK_ENV ((const fenv_t *) -2) 103 #endif 104 105 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) 106 /* Type representing floating-point control modes. */ 107 typedef unsigned int femode_t; 108 109 /* Default floating-point control modes. */ 110 # define FE_DFL_MODE ((const femode_t *) -1L) 111 #endif 112