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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [stormy16/] [stormy16-lib2.c] - Rev 282
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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, 2008, 2009 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 3, or (at your option) any later version. 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. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #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 #ifndef MIN_UNITS_PER_WORD #define MIN_UNITS_PER_WORD UNITS_PER_WORD #endif #ifndef LIBGCC2_UNITS_PER_WORD # if MIN_UNITS_PER_WORD > 4 # define LIBGCC2_UNITS_PER_WORD 8 # elif (MIN_UNITS_PER_WORD > 2 \ || (MIN_UNITS_PER_WORD > 1 && LONG_LONG_TYPE_SIZE > 32)) # define LIBGCC2_UNITS_PER_WORD 4 # else # define LIBGCC2_UNITS_PER_WORD MIN_UNITS_PER_WORD # endif #endif #define word_type Wtype #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); #ifdef XSTORMY16_UDIVMODSI4 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; } #endif #ifdef XSTORMY16_DIVSI3 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; } #endif #ifdef XSTORMY16_MODSI3 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; } #endif #ifdef XSTORMY16_UDIVSI3 SItype __udivsi3 (SItype a, SItype b) { return udivmodsi4 (a, b, 0); } #endif #ifdef XSTORMY16_UMODSI3 SItype __umodsi3 (SItype a, SItype b) { return udivmodsi4 (a, b, 1); } #endif #ifdef XSTORMY16_ASHLSI3 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; } #endif #ifdef XSTORMY16_ASHRSI3 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; } #endif #ifdef XSTORMY16_LSHRSI3 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; } #endif #ifdef XSTORMY16_POPCOUNTHI2 /* Returns the number of set bits in X. FIXME: The return type really should be "unsigned int" 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; } #endif #ifdef XSTORMY16_PARITYHI2 /* Returns the number of set bits in X, modulo 2. FIXME: The return type really should be "unsigned int" 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; } #endif #ifdef XSTORMY16_CLZHI2 /* Returns the number of zero-bits from the most significant bit to the first nonzero bit in X. Returns 16 for X == 0. Implemented as a simple for loop in order to save space by removing the need for the __clz_tab array. FIXME: The return type really should be "unsigned int" but this is not how the builtin is prototyped. */ #undef unsigned int __clzhi2 (UHWtype x) { unsigned int i; unsigned int c; unsigned int value = x; for (c = 0, i = 1 << 15; i; i >>= 1, c++) if (i & value) break; return c; } #endif #ifdef XSTORMY16_CTZHI2 /* Returns the number of trailing zero bits in X. FIXME: The return type really should be "signed int" since ctz(0) returns -1, 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 that was the least significant bit in X. From this we can use the count_leading_zeros to compute the number of trailing bits. */ x &= - x; return 15 - __builtin_clz (x); } #endif #ifdef XSTORMY16_FFSHI2 /* Returns one plus the index of the least significant 1-bit of X, or if X is zero, returns zero. FIXME: The return type really should be "unsigned int" but this is not how the builtin is prototyped. */ int __ffshi2 (UHWtype u) { UHWtype count; if (u == 0) return 0; return 16 - __builtin_clz (u & - u); } #endif