Copy from trunk.

1 files changed, 60 insertions, 0 deletions

diff --git a/libc/string/i386/memmove.c b/libc/string/i386/memmove.c
new file mode 100644
index 000000000..4bc5f3e42
--- /dev/null
+++ b/libc/string/i386/memmove.c
@@ -0,0 +1,60 @@
+/*
+ * This string-include defines all string functions as inline
+ * functions. Use gcc. It also assumes ds=es=data space, this should be
+ * normal. Most of the string-functions are rather heavily hand-optimized,
+ * see especially strtok,strstr,str[c]spn. They should work, but are not
+ * very easy to understand. Everything is done entirely within the register
+ * set, making the functions fast and clean. String instructions have been
+ * used through-out, making for "slightly" unclear code :-)
+ *
+ *		NO Copyright (C) 1991, 1992 Linus Torvalds,
+ *		consider these trivial functions to be PD.
+ */
+
+/*
+ * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+ * Modified for uClibc by Erik Andersen <andersen@codepoet.org>
+ * These make no attempt to use nifty things like mmx/3dnow/etc.
+ * These are not inline, and will therefore not be as fast as
+ * modifying the headers to use inlines (and cannot therefore
+ * do tricky things when dealing with const memory).  But they
+ * should (I hope!) be faster than their generic equivalents....
+ *
+ * More importantly, these should provide a good example for
+ * others to follow when adding arch specific optimizations.
+ *  -Erik
+ */
+
+#include <string.h>
+
+#undef memmove
+void attribute_hidden *__memmove(void *dest, const void *src, size_t n)
+{
+    int d0, d1, d2;
+    if (dest<src)
+	__asm__ __volatile__(
+		"rep\n\t"
+		"movsb"
+		: "=&c" (d0), "=&S" (d1), "=&D" (d2)
+		:"0" (n),"1" (src),"2" (dest)
+		: "memory");
+    else
+	__asm__ __volatile__(
+		"std\n\t"
+		"rep\n\t"
+		"movsb\n\t"
+		"cld"
+		: "=&c" (d0), "=&S" (d1), "=&D" (d2)
+		:"0" (n),
+		"1" (n-1+(const char *)src),
+		"2" (n-1+(char *)dest)
+		:"memory");
+    return dest;
+}
+
+strong_alias(__memmove, memmove)