From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Sat, 18 Feb 1995 01:27:10 +0000
Subject: initial import

---
 sysdeps/i386/memcopy.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 sysdeps/i386/memcopy.h

(limited to 'sysdeps/i386/memcopy.h')

diff --git a/sysdeps/i386/memcopy.h b/sysdeps/i386/memcopy.h
new file mode 100644
index 0000000000..506d3ea54d
--- /dev/null
+++ b/sysdeps/i386/memcopy.h
@@ -0,0 +1,86 @@
+/* memcopy.h -- definitions for memory copy functions.  i386 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>
+
+#undef	OP_T_THRES
+#define	OP_T_THRES	8
+
+#undef	BYTE_COPY_FWD
+#define BYTE_COPY_FWD(dst_bp, src_bp, nbytes)				      \
+  asm volatile(/* Clear the direction flag, so copying goes forward.  */      \
+	       "cld\n"							      \
+	       /* Copy bytes.  */					      \
+	       "rep\n"							      \
+	       "movsb" :						      \
+	       "=D" (dst_bp), "=S" (src_bp) :				      \
+	       "0" (dst_bp), "1" (src_bp), "c" (nbytes) :		      \
+	       "cx")
+
+#undef	BYTE_COPY_BWD
+#define BYTE_COPY_BWD(dst_ep, src_ep, nbytes)				      \
+  do									      \
+    {									      \
+      asm volatile(/* Set the direction flag, so copying goes backwards.  */  \
+		   "std\n"						      \
+		   /* Copy bytes.  */					      \
+		   "rep\n"						      \
+		   "movsb\n"						      \
+		   /* Clear the dir flag.  Convention says it should be 0. */ \
+		   "cld" :						      \
+		   "=D" (dst_ep), "=S" (src_ep) :			      \
+		   "0" (dst_ep - 1), "1" (src_ep - 1), "c" (nbytes) :	      \
+		   "cx");						      \
+      dst_ep += 1;							      \
+      src_ep += 1;							      \
+    } while (0)
+
+#undef	WORD_COPY_FWD
+#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes)		      \
+  do									      \
+    {									      \
+      asm volatile(/* Clear the direction flag, so copying goes forward.  */  \
+		   "cld\n"						      \
+		   /* Copy longwords.  */				      \
+		   "rep\n"						      \
+		   "movsl" :						      \
+		   "=D" (dst_bp), "=S" (src_bp) :			      \
+		   "0" (dst_bp), "1" (src_bp), "c" ((nbytes) / 4) :	      \
+		   "cx");						      \
+      (nbytes_left) = (nbytes) % 4;					      \
+    } while (0)
+
+#undef	WORD_COPY_BWD
+#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes)		      \
+  do									      \
+    {									      \
+      asm volatile(/* Set the direction flag, so copying goes backwards.  */  \
+		   "std\n"						      \
+		   /* Copy longwords.  */				      \
+		   "rep\n"						      \
+		   "movsl\n"						      \
+		   /* Clear the dir flag.  Convention says it should be 0. */ \
+		   "cld" :						      \
+		   "=D" (dst_ep), "=S" (src_ep) :			      \
+		   "0" (dst_ep - 4), "1" (src_ep - 4), "c" ((nbytes) / 4) :   \
+		   "cx");						      \
+      dst_ep += 4;							      \
+      src_ep += 4;							      \
+      (nbytes_left) = (nbytes) % 4;					      \
+    } while (0)
-- 
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