/* memcopy.h -- definitions for memory copy functions. Motorola 68020 version. Copyright (C) 1991, 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Torbjorn Granlund (tege@sics.se). The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <sysdeps/generic/memcopy.h> #if defined(__mc68020__) || defined(mc68020) #undef OP_T_THRES #define OP_T_THRES 16 /* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020, because of its weird instruction overlap characteristics. */ #undef WORD_COPY_FWD #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \ do \ { \ size_t __nwords = (nbytes) / sizeof (op_t); \ size_t __nblocks = __nwords / 8 + 1; \ dst_bp -= (8 - __nwords % 8) * sizeof (op_t); \ src_bp -= (8 - __nwords % 8) * sizeof (op_t); \ switch (__nwords % 8) \ do \ { \ ((op_t *) dst_bp)[0] = ((op_t *) src_bp)[0]; \ case 7: \ ((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \ case 6: \ ((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \ case 5: \ ((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \ case 4: \ ((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \ case 3: \ ((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \ case 2: \ ((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \ case 1: \ ((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \ case 0: \ src_bp += 32; \ dst_bp += 32; \ __nblocks--; \ } \ while (__nblocks != 0); \ (nbytes_left) = (nbytes) % sizeof (op_t); \ } while (0) #undef WORD_COPY_BWD #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ do \ { \ size_t __nblocks = (nbytes) / 32 + 1; \ switch ((nbytes) / sizeof (op_t) % 8) \ do \ { \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 7: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 6: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 5: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 4: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 3: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 2: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 1: \ *--((op_t *) dst_ep) = *--((op_t *) src_ep); \ case 0: \ __nblocks--; \ } \ while (__nblocks != 0); \ (nbytes_left) = (nbytes) % sizeof (op_t); \ } while (0) #endif