1 files changed, 23 insertions, 0 deletions
diff --git a/S/byte_copy.S b/S/byte_copy.S
new file mode 100644
index 0000000..44ff449
--- /dev/null
+++ b/S/byte_copy.S
@@ -0,0 +1,23 @@
+.globl byte_copy
+.type   byte_copy, @function
+byte_copy:
+        pushl   %edi
+        pushl   %esi
+        movl    12(%esp), %edi
+        movl    16(%esp), %ecx
+        movl    20(%esp), %esi
+        cld
+
+#ifdef BYTE_COPY_FAST	
+        movl    %ecx, %eax
+        shrl    $2, %ecx
+        andl    $3, %eax
+
+	rep	movsl
+	movl	%eax, %ecx
+#endif
+	rep	movsb
+
+        popl    %esi
+        popl    %edi
+        ret