lib2funcs.c revision 1.1.1.2
1/* libgcc routines for ARC 2 Copyright (C) 2019-2022 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published 8 by the Free Software Foundation; either version 3, or (at your 9 option) any later version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 26typedef int sint64_t __attribute__ ((mode (DI))); 27typedef unsigned int uint64_t __attribute__ ((mode (DI))); 28typedef unsigned int nint32_t __attribute__ ((mode (SI))); 29typedef int word_t __attribute__ ((mode (__word__))); 30 31sint64_t __muldi3 (sint64_t, sint64_t); 32nint32_t __umodsi3 (nint32_t, nint32_t); 33 34#ifdef __ARC_RF16__ 35 36/* Generic multiplication procedure. No mpy operation involved. */ 37sint64_t 38__muldi3 (sint64_t a, sint64_t b) 39{ 40 sint64_t res = 0; 41 uint64_t cnt = a; 42 43 while (cnt) 44 { 45 if (cnt & 1) 46 res += b; 47 b <<= 1; 48 cnt >>= 1; 49 } 50 return res; 51} 52 53/* Unsigned 32bit integer division/modulus. */ 54 55static inline __attribute__ ((__always_inline__)) 56nint32_t 57udivmodsi4 (nint32_t num, nint32_t den, word_t modwanted) 58{ 59 nint32_t bit = 1; 60 nint32_t res = 0; 61 62 while (den < num && bit && !(den & (1LL << 63))) 63 { 64 den <<= 1; 65 bit <<= 1; 66 } 67 while (bit) 68 { 69 if (num >= den) 70 { 71 num -= den; 72 res |= bit; 73 } 74 bit >>= 1; 75 den >>= 1; 76 } 77 if (modwanted) 78 return num; 79 return res; 80} 81 82nint32_t 83__umodsi3 (nint32_t a, nint32_t b) 84{ 85 return udivmodsi4 (a, b, 1); 86} 87 88#endif 89