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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
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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
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+++ b/sysdeps/m68k/memcopy.h
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+/* 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