[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/build/uClibc/libc/string/i386/memmove.c b/ap/build/uClibc/libc/string/i386/memmove.c
new file mode 100644
index 0000000..0ec8016
--- /dev/null
+++ b/ap/build/uClibc/libc/string/i386/memmove.c
@@ -0,0 +1,71 @@
+/*
+ * 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
+/*#define memmove TESTING*/
+void *memmove(void *dest, const void *src, size_t n)
+{
+ int eax, ecx, esi, edi;
+ __asm__ __volatile__(
+ " movl %%eax, %%edi\n"
+ " cmpl %%esi, %%eax\n"
+ " je 2f\n" /* (optional) src == dest -> NOP */
+ " jb 1f\n" /* src > dest -> simple copy */
+ " leal -1(%%esi,%%ecx), %%esi\n"
+ " leal -1(%%eax,%%ecx), %%edi\n"
+ " std\n"
+ "1: rep; movsb\n"
+ " cld\n"
+ "2:\n"
+ : "=&c" (ecx), "=&S" (esi), "=&a" (eax), "=&D" (edi)
+ : "0" (n), "1" (src), "2" (dest)
+ : "memory"
+ );
+ return (void*)eax;
+}
+#ifndef memmove
+libc_hidden_def(memmove)
+#else
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os memmove.c -o memmove
+ * and run ./memmove
+ */
+int main()
+{
+ static char str[] = "abcdef.123";
+ memmove(str + 1, str, 5);
+ printf(strcmp(str, "aabcde.123") == 0 ? "ok\n" : "BAD!\n");
+ memmove(str, str + 1, 5);
+ printf(strcmp(str, "abcdee.123") == 0 ? "ok\n" : "BAD!\n");
+}
+#endif