From 73b05b9d595ad5ac3949df548bf6d9aab868a4ff Mon Sep 17 00:00:00 2001
From: sergey-ryvkin <126426790+sergey-ryvkin@users.noreply.github.com>
Date: Tue, 7 Mar 2023 14:56:13 +0300
Subject: [PATCH] Update memcpy.c

transfer data safety optimization
---
 libgcc/memcpy.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/libgcc/memcpy.c b/libgcc/memcpy.c
index 58b1e405627aa..4a31424dd228a 100644
--- a/libgcc/memcpy.c
+++ b/libgcc/memcpy.c
@@ -4,9 +4,18 @@
 void *
 memcpy (void *dest, const void *src, size_t len)
 {
-  char *d = dest;
-  const char *s = src;
-  while (len--)
-    *d++ = *s++;
+  char *d;
+  const char *s;
+  if((size_t)destination<(size_t)source){
+    s=src+len;
+    d=dest+len;
+    while(len--)
+      *--d = *--s;
+  }else if((size_t)destination>(size_t)source){
+    s=src;
+    d=dest;
+    while (len--)
+      *d++ = *s++;
+  }
   return dest;
 }