1 /* FPU control word bits. RISC-V version. 2 Copyright (C) 1996-2021 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 _FPU_CONTROL_H 20 #define _FPU_CONTROL_H 21 22 #include <features.h> 23 24 #ifndef __riscv_flen 25 26 # define _FPU_RESERVED 0xffffffff 27 # define _FPU_DEFAULT 0x00000000 28 typedef unsigned int fpu_control_t; 29 # define _FPU_GETCW(cw) (cw) = 0 30 # define _FPU_SETCW(cw) do { } while (0) 31 extern fpu_control_t __fpu_control; 32 33 #else /* __riscv_flen */ 34 35 # define _FPU_RESERVED 0 36 # define _FPU_DEFAULT 0 37 # define _FPU_IEEE _FPU_DEFAULT 38 39 /* Type of the control word. */ 40 typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__))); 41 42 /* Macros for accessing the hardware control word. */ 43 # define _FPU_GETCW(cw) __asm__ volatile ("frsr %0" : "=r" (cw)) 44 # define _FPU_SETCW(cw) __asm__ volatile ("fssr %z0" : : "rJ" (cw)) 45 46 /* Default control word set at startup. */ 47 extern fpu_control_t __fpu_control; 48 49 # define _FCLASS(x) (__extension__ ({ int __res; \ 50 if (sizeof (x) * 8 > __riscv_flen) __builtin_trap (); \ 51 if (sizeof (x) == 4) asm ("fclass.s %0, %1" : "=r" (__res) : "f" (x)); \ 52 else if (sizeof (x) == 8) asm ("fclass.d %0, %1" : "=r" (__res) : "f" (x)); \ 53 else __builtin_trap (); \ 54 __res; })) 55 56 # define _FCLASS_MINF (1 << 0) 57 # define _FCLASS_MNORM (1 << 1) 58 # define _FCLASS_MSUBNORM (1 << 2) 59 # define _FCLASS_MZERO (1 << 3) 60 # define _FCLASS_PZERO (1 << 4) 61 # define _FCLASS_PSUBNORM (1 << 5) 62 # define _FCLASS_PNORM (1 << 6) 63 # define _FCLASS_PINF (1 << 7) 64 # define _FCLASS_SNAN (1 << 8) 65 # define _FCLASS_QNAN (1 << 9) 66 # define _FCLASS_ZERO (_FCLASS_MZERO | _FCLASS_PZERO) 67 # define _FCLASS_SUBNORM (_FCLASS_MSUBNORM | _FCLASS_PSUBNORM) 68 # define _FCLASS_NORM (_FCLASS_MNORM | _FCLASS_PNORM) 69 # define _FCLASS_INF (_FCLASS_MINF | _FCLASS_PINF) 70 # define _FCLASS_NAN (_FCLASS_SNAN | _FCLASS_QNAN) 71 72 #endif /* __riscv_flen */ 73 74 #endif /* fpu_control.h */