A simple optimization for strcmp()

[Soeren Sandmann]

I'm not sure I'm sending this to the right address. If not, please
tell where I should send it.

The patch below has a simple optimization for strcmp() for the case
where the two passed pointers are identical.  By returning immediately
in that case, you avoid reading both strings in from memory. 

I think this is a fairly common case, because constant strings are
often used as identifiers.

Sorry, I haven't benchmarked it.

Søren

--- strcmp.c.orig       Fri May  2 15:07:44 2003
+++ strcmp.c    Fri May  2 15:08:12 2003
@@ -33,6 +33,9 @@
   register const unsigned char *s2 = (const unsigned char *) p2;
   unsigned reg_char c1, c2;
 
+  if (p1 == p2)
+    return 0;
+  
   do
     {
       c1 = (unsigned char) *s1++;