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Diffstat (limited to 'sysdeps/m68k/memcopy.h')
| -rw-r--r-- | sysdeps/m68k/memcopy.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/sysdeps/m68k/memcopy.h b/sysdeps/m68k/memcopy.h new file mode 100644 index 0000000000..862e1b8a7f --- /dev/null +++ b/sysdeps/m68k/memcopy.h @@ -0,0 +1,95 @@ +/* memcopy.h -- definitions for memory copy functions. Motorola 68020 version. + Copyright (C) 1991 Free Software Foundation, Inc. + 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., 675 Mass Ave, +Cambridge, MA 02139, 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 |