1 /* Floating point environment. C-SKY version. 2 Copyright (C) 2018-2025 Free Software Foundation, Inc. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library. If not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _FENV_H 19 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." 20 #endif 21 22 #ifdef __csky_hard_float__ 23 /* Define bits representing the exception. We use the bit positions 24 of the appropriate bits in the FPU control word. */ 25 enum 26 { 27 FE_INVALID = 28 #define FE_INVALID 0x01 29 FE_INVALID, 30 FE_DIVBYZERO = 31 #define FE_DIVBYZERO 0x02 32 FE_DIVBYZERO, 33 FE_OVERFLOW = 34 #define FE_OVERFLOW 0x04 35 FE_OVERFLOW, 36 FE_UNDERFLOW = 37 #define FE_UNDERFLOW 0x08 38 FE_UNDERFLOW, 39 FE_INEXACT = 40 #define FE_INEXACT 0x10 41 FE_INEXACT, 42 __FE_DENORMAL = 0x20 43 }; 44 45 #define FE_ALL_EXCEPT \ 46 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 47 48 /* The C-SKY FPU supports all of the four defined rounding modes. We 49 use again the bit positions in the FPU control word as the values 50 for the appropriate macros. */ 51 enum 52 { 53 FE_TONEAREST = 54 #define FE_TONEAREST (0x0 << 24) 55 FE_TONEAREST, 56 FE_TOWARDZERO = 57 #define FE_TOWARDZERO (0x1 << 24) 58 FE_TOWARDZERO, 59 FE_UPWARD = 60 #define FE_UPWARD (0x2 << 24) 61 FE_UPWARD, 62 FE_DOWNWARD = 63 #define FE_DOWNWARD (0x3 << 24) 64 FE_DOWNWARD, 65 __FE_ROUND_MASK = (0x3 << 24) 66 }; 67 68 #else 69 70 /* In the soft-float case, only rounding to nearest is supported, with 71 no exceptions. */ 72 73 enum 74 { 75 __FE_UNDEFINED = -1, 76 77 FE_TONEAREST = 78 # define FE_TONEAREST 0x0 79 FE_TONEAREST 80 }; 81 82 # define FE_ALL_EXCEPT 0 83 84 #endif 85 86 /* Type representing exception flags. */ 87 typedef unsigned int fexcept_t; 88 89 /* Type representing floating-point environment. */ 90 typedef struct 91 { 92 unsigned int __fpcr; 93 unsigned int __fpsr; 94 } fenv_t; 95 96 /* If the default argument is used we use this value. */ 97 #define FE_DFL_ENV ((const fenv_t *) -1) 98 99 #if defined __USE_GNU && defined __csky_hard_float__ 100 /* Floating-point environment where none of the exceptions are masked. */ 101 # define FE_NOMASK_ENV ((const fenv_t *) -2) 102 #endif 103 104 /* Type representing floating-point control modes. */ 105 typedef unsigned int femode_t; 106 107 /* Default floating-point control modes. */ 108 # define FE_DFL_MODE ((const femode_t *) -1L) 109