remove "clrl r0", which didn't clear carry

SCCS-vsn: sys/vax/vax/in_cksum.c 6.3

diff --git a/usr/src/sys/vax/vax/in_cksum.c b/usr/src/sys/vax/vax/in_cksum.c
index 34381c7..8b7903a 100644 (file)
--- a/usr/src/sys/vax/vax/in_cksum.c
+++ b/usr/src/sys/vax/vax/in_cksum.c
@@ -1,4 +1,4 @@
-/*     in_cksum.c      6.2     84/08/28        */
+/*     in_cksum.c      6.3     85/05/01        */

 
 #include "types.h"
 #include "mbuf.h"
 
 #include "types.h"
 #include "mbuf.h"


@@ -70,14 +70,18 @@ in_cksum(m, len)
                 */
                while ((mlen -= 32) >= 0) {
 #undef ADD
                 */
                while ((mlen -= 32) >= 0) {
 #undef ADD

-                       asm("clrl r0");         /* clears carry */
+#ifdef unneeded                 /* The loop construct clears carry for us... */
+                       asm("bicpsr $1");               /* clears carry */
+#endif

 #define ADD            asm("adwc (r9)+,r8;");
                        ADD; ADD; ADD; ADD; ADD; ADD; ADD; ADD;
                        asm("adwc $0,r8");
                }
                mlen += 32;
                while ((mlen -= 8) >= 0) {
 #define ADD            asm("adwc (r9)+,r8;");
                        ADD; ADD; ADD; ADD; ADD; ADD; ADD; ADD;
                        asm("adwc $0,r8");
                }
                mlen += 32;
                while ((mlen -= 8) >= 0) {

-                       asm("clrl r0");
+#ifdef unneeded                 /* The loop construct clears carry for us... */
+                       asm("bicpsr $1");               /* clears carry */
+#endif

                        ADD; ADD;
                        asm("adwc $0,r8");
                }
                        ADD; ADD;
                        asm("adwc $0,r8");
                }