Definitions for efficient copying on CRIS.
authordrepper <drepper>
Tue, 10 Apr 2001 00:23:12 +0000 (00:23 +0000)
committerdrepper <drepper>
Tue, 10 Apr 2001 00:23:12 +0000 (00:23 +0000)
sysdeps/cris/memcopy.h [new file with mode: 0644]

diff --git a/sysdeps/cris/memcopy.h b/sysdeps/cris/memcopy.h
new file mode 100644 (file)
index 0000000..7bcf634
--- /dev/null
@@ -0,0 +1,57 @@
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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>
+
+/* We override the word-copying macros, partly because misalignment in one
+   pointer isn't cause for a special function, partly because we want to
+   get rid of wordcopy.c; these macros are only used in memmove.c (and
+   it's sibling bcopy) since we have arch-specific mempcpy, memcpy and
+   memset.  */
+
+#undef OP_T_THRES
+#define OP_T_THRES OPSIZ
+
+#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes)             \
+  do                                                                   \
+    {                                                                  \
+      unsigned long enddst_bp = dst_bp + nbytes - (nbytes % OPSIZ);    \
+      nbytes_left = (nbytes % OPSIZ);                                  \
+      while (dst_bp < (unsigned long) enddst_bp)                       \
+       {                                                               \
+         op_t x = *(op_t *) src_bp;                                    \
+         src_bp += sizeof x;                                           \
+         *(op_t *) dst_bp = x;                                         \
+         dst_bp += sizeof x;                                           \
+       }                                                               \
+    } while (0)
+
+#define WORD_COPY_BWD(dst_bp, src_bp, nbytes_left, nbytes)             \
+  do                                                                   \
+    {                                                                  \
+      unsigned long enddst_bp = dst_bp - nbytes + (nbytes % OPSIZ);    \
+      nbytes_left = (nbytes % OPSIZ);                                  \
+      while (dst_bp > enddst_bp)                                       \
+       {                                                               \
+         op_t x;                                                       \
+         src_bp -= sizeof x;                                           \
+         x = *(op_t *) src_bp;                                         \
+         dst_bp -= sizeof x;                                           \
+         *(op_t *) dst_bp = x;                                         \
+       }                                                               \
+    } while (0)