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-rw-r--r--sysdeps/m68k/memcopy.h100
1 files changed, 100 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, 1997, 2004 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; 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;				      \
+      op_t *__dst_ep = (op_t *) (dst_ep);				      \
+      op_t *__src_ep = (op_t *) (src_ep);				      \
+      switch ((nbytes) / sizeof (op_t) % 8)				      \
+	do								      \
+	  {								      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 7:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 6:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 5:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 4:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 3:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 2:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 1:							      \
+	    *--__dst_ep = *--__src_ep;					      \
+	  case 0:							      \
+	    __nblocks--;						      \
+	  }								      \
+      while (__nblocks != 0);						      \
+      (nbytes_left) = (nbytes) % sizeof (op_t);				      \
+      (dst_ep) = (unsigned long) __dst_ep;				      \
+      (src_ep) = (unsigned long) __src_ep;				      \
+    } while (0)
+
+#endif