URL
https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [config/] [mt/] [lib2extra-funcs.c] - Rev 154
Compare with Previous | Blame | View Log
/* Copyright (C) 2005 Free Software Foundation, This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. In addition to the permissions in the GNU General Public License, the Free Software Foundation gives you unlimited permission to link the compiled version of this file into combinations with other programs, and to distribute those combinations without any restriction coming from the use of this file. (The General Public License restrictions do apply in other respects; for example, they cover modification of the file, and distribution when not linked into a combine executable.) GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #define BITS_PER_UNIT 8 typedef int HItype __attribute__ ((mode (HI))); typedef unsigned int UHItype __attribute__ ((mode (HI))); typedef int SItype __attribute__ ((mode (SI))); typedef unsigned int USItype __attribute__ ((mode (SI))); typedef int word_type __attribute__ ((mode (__word__))); struct SIstruct {HItype low, high;}; typedef union { struct SIstruct s; SItype ll; } SIunion; SItype __lshrsi3 (SItype u, word_type b) { SIunion w; word_type bm; SIunion uu; if (b == 0) return u; uu.ll = u; bm = (sizeof (HItype) * BITS_PER_UNIT) - b; if (bm <= 0) { w.s.high = 0; w.s.low = (UHItype)uu.s.high >> -bm; } else { UHItype carries = (UHItype)uu.s.high << bm; w.s.high = (UHItype)uu.s.high >> b; w.s.low = ((UHItype)uu.s.low >> b) | carries; } return w.ll; } SItype __ashlsi3 (SItype u, word_type b) { SIunion w; word_type bm; SIunion uu; if (b == 0) return u; uu.ll = u; bm = (sizeof (HItype) * BITS_PER_UNIT) - b; if (bm <= 0) { w.s.low = 0; w.s.high = (UHItype)uu.s.low << -bm; } else { UHItype carries = (UHItype)uu.s.low >> bm; w.s.low = (UHItype)uu.s.low << b; w.s.high = ((UHItype)uu.s.high << b) | carries; } return w.ll; } SItype __ashrsi3 (SItype u, word_type b) { SIunion w; word_type bm; SIunion uu; if (b == 0) return u; uu.ll = u; bm = (sizeof (HItype) * BITS_PER_UNIT) - b; if (bm <= 0) { /* w.s.high = 1..1 or 0..0 */ w.s.high = uu.s.high >> (sizeof (HItype) * BITS_PER_UNIT - 1); w.s.low = uu.s.high >> -bm; } else { UHItype carries = (UHItype)uu.s.high << bm; w.s.high = uu.s.high >> b; w.s.low = ((UHItype)uu.s.low >> b) | carries; } return w.ll; } USItype __mulsi3 (USItype a, USItype b) { USItype c = 0; while (a != 0) { if (a & 1) c += b; a >>= 1; b <<= 1; } return c; } USItype udivmodsi4(USItype num, USItype den, word_type modwanted) { USItype bit = 1; USItype res = 0; while (den < num && bit && !(den & (1L<<31))) { den <<=1; bit <<=1; } while (bit) { if (num >= den) { num -= den; res |= bit; } bit >>=1; den >>=1; } if (modwanted) return num; return res; } SItype __divsi3 (SItype a, SItype b) { word_type neg = 0; SItype res; if (a < 0) { a = -a; neg = !neg; } if (b < 0) { b = -b; neg = !neg; } res = udivmodsi4 (a, b, 0); if (neg) res = -res; return res; } SItype __modsi3 (SItype a, SItype b) { word_type neg = 0; SItype res; if (a < 0) { a = -a; neg = 1; } if (b < 0) b = -b; res = udivmodsi4 (a, b, 1); if (neg) res = -res; return res; } SItype __udivsi3 (SItype a, SItype b) { return udivmodsi4 (a, b, 0); } SItype __umodsi3 (SItype a, SItype b) { return udivmodsi4 (a, b, 1); }