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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [stormy16/] [stormy16-lib2.c] - Rev 856
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/* This file contains 16-bit versions of some of the functions found in libgcc2.c. Really libgcc ought to be moved out of the gcc directory and into its own top level directory, and then split up into multiple files. On this glorious day maybe this code can be integrated into it too. */ /* Copyright (C) 2005 Free Software Foundation, Inc. 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. */ #include "tconfig.h" #include "tsystem.h" #include "coretypes.h" #include "tm.h" #ifdef HAVE_GAS_HIDDEN #define ATTRIBUTE_HIDDEN __attribute__ ((__visibility__ ("hidden"))) #else #define ATTRIBUTE_HIDDEN #endif #include "libgcc2.h" #undef int /* These prototypes would normally live in libgcc2.h, but this can only happen once the code below is integrated into libgcc2.c. */ extern USItype udivmodsi4 (USItype, USItype, word_type); extern SItype __divsi3 (SItype, SItype); extern SItype __modsi3 (SItype, SItype); extern SItype __udivsi3 (SItype, SItype); extern SItype __umodsi3 (SItype, SItype); extern SItype __ashlsi3 (SItype, SItype); extern SItype __ashrsi3 (SItype, SItype); extern USItype __lshrsi3 (USItype, USItype); extern int __popcounthi2 (UHWtype); extern int __parityhi2 (UHWtype); extern int __clzhi2 (UHWtype); extern int __ctzhi2 (UHWtype); 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); } SItype __ashlsi3 (SItype a, SItype b) { word_type i; if (b & 16) a <<= 16; if (b & 8) a <<= 8; for (i = (b & 0x7); i > 0; --i) a <<= 1; return a; } SItype __ashrsi3 (SItype a, SItype b) { word_type i; if (b & 16) a >>= 16; if (b & 8) a >>= 8; for (i = (b & 0x7); i > 0; --i) a >>= 1; return a; } USItype __lshrsi3 (USItype a, USItype b) { word_type i; if (b & 16) a >>= 16; if (b & 8) a >>= 8; for (i = (b & 0x7); i > 0; --i) a >>= 1; return a; } /* Returns the number of set bits in X. FIXME: The return type really should be unsigned, but this is not how the builtin is prototyped. */ int __popcounthi2 (UHWtype x) { int ret; ret = __popcount_tab [x & 0xff]; ret += __popcount_tab [(x >> 8) & 0xff]; return ret; } /* Returns the number of set bits in X, modulo 2. FIXME: The return type really should be unsigned, but this is not how the builtin is prototyped. */ int __parityhi2 (UHWtype x) { x ^= x >> 8; x ^= x >> 4; x &= 0xf; return (0x6996 >> x) & 1; } /* Returns the number of leading zero bits in X. FIXME: The return type really should be unsigned, but this is not how the builtin is prototyped. */ int __clzhi2 (UHWtype x) { if (x > 0xff) return 8 - __clz_tab[x >> 8]; return 16 - __clz_tab[x]; } /* Returns the number of trailing zero bits in X. FIXME: The return type really should be unsigned, but this is not how the builtin is prototyped. */ int __ctzhi2 (UHWtype x) { /* This is cunning. It converts X into a number with only the one bit set, the bit was the least significant bit in X. From this we can use the __clz_tab[] array to compute the number of trailing bits. */ x &= - x; if (x > 0xff) return __clz_tab[x >> 8] + 7; return __clz_tab[x] - 1; }
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