* Optimised many of the library functions

[fw/sdcc] / device / lib / _memcpy.c

diff --git a/device/lib/_memcpy.c b/device/lib/_memcpy.c
index e1d0770067a940470b506e5ca5a348e95f16cab2..2bb6d29f6be6f927cf3ebdea1c4ed3574d64a85a 100644 (file)
--- a/device/lib/_memcpy.c
+++ b/device/lib/_memcpy.c
@@ -3,17 +3,17 @@
 
              Written By -  Sandeep Dutta . sandeep.dutta@usa.net (1999)
 
-   This program is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by the
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published by the
    Free Software Foundation; either version 2, or (at your option) any
    later version.
    
-   This program is distributed in the hope that it will be useful,
+   This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
+   GNU Library General Public License for more details.
    
-   You should have received a copy of the GNU General Public License
+   You should have received a copy of the GNU Library General Public License
    along with this program; if not, write to the Free Software
    Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    
@@ -22,14 +22,40 @@
    what you give them.   Help stamp out software-hoarding!  
 -------------------------------------------------------------------------*/
 #include "string.h" 
+#include <sdcc-lib.h>
+
 #define NULL (void *)0
 
 void _generic * memcpy (
        void _generic * dst,
        void _generic * src,
-       int count
+       int acount
        ) 
 {
+#if _SDCC_Z80_STYLE_LIB_OPT
+       char _generic * d = dst;
+       char _generic * s = src;
+       int count = -acount;
+
+        count /= 4;
+        
+        while (count) {
+               *d++ = *s++;
+               *d++ = *s++;
+               *d++ = *s++;
+               *d++ = *s++;
+                count++;
+        }
+
+        if (acount & 2) {
+               *d++ = *s++; 
+               *d++ = *s++;
+        }
+        if (acount & 1) {
+               *d++ = *s++;
+        }
+       return dst;
+#else
        void _generic * ret = dst;
        char _generic * d = dst;
        char _generic * s = src;
@@ -37,9 +63,10 @@ void _generic * memcpy (
        /*
         * copy from lower addresses to higher addresses
         */
-       while (count--) {
+       while (acount--) {
                *d++ = *s++;
        }
 
        return(ret);
+#endif
 }