summaryrefslogtreecommitdiff
path: root/sysdeps/m68k/memcopy.h
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/m68k/memcopy.h
downloadglibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz
initial import
Diffstat (limited to 'sysdeps/m68k/memcopy.h')
-rw-r--r--sysdeps/m68k/memcopy.h95
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