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-rw-r--r--sysdeps/i386/memcopy.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/sysdeps/i386/memcopy.h b/sysdeps/i386/memcopy.h
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+/* 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)