From 1564ca8e5ec57255a19ddee42882fa8782394110 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Thu, 4 Feb 1999 14:56:09 +0000
Subject: Added PowerPC specific header checksum code.

---
 .../exec/libnetworking/netinet/in_cksum_powerpc.c  | 39 +++-------------------
 1 file changed, 5 insertions(+), 34 deletions(-)

(limited to 'c/src/exec')

diff --git a/c/src/exec/libnetworking/netinet/in_cksum_powerpc.c b/c/src/exec/libnetworking/netinet/in_cksum_powerpc.c
index 8e0a417163..fe2f04e246 100644
--- a/c/src/exec/libnetworking/netinet/in_cksum_powerpc.c
+++ b/c/src/exec/libnetworking/netinet/in_cksum_powerpc.c
@@ -42,6 +42,7 @@ in_cksum(m, len)
 	register struct mbuf *m;
 	register int len;
 {
+	u_char junk;
 	register u_short *w;
 	register unsigned sum = 0;
 	register unsigned tmp;
@@ -91,30 +92,13 @@ in_cksum(m, len)
 				mlen -= 2;
 			}
 		}
-		/*
-		 * Advance to a cache line boundary.
-		 */
-		if (4 & (int) w && mlen >= 4) {
-			ADD(0);
-			MOP;
-			w += 2;
-			mlen -= 4;
-		}
-		if (8 & (int) w && mlen >= 8) {
-			ADD(0);
-			ADDC(4);
-			MOP;
-			w += 4;
-			mlen -= 8;
-		}
+
 		/*
 		 * Do as much of the checksum as possible 32 bits at at time.
-		 * In fact, this loop is unrolled to make overhead from
-		 * branches &c small.
+		 * In fact, this loop is unrolled to keep overhead from
+		 * branches small.
 		 */
-		mlen -= 1;
-		while ((mlen -= 32) >= 0) {
-			u_char junk;
+		while (mlen >= 32) {
 			/*
 			 * Add with carry 16 words and fold in the last
 			 * carry by adding a 0 with carry.
@@ -133,19 +117,6 @@ in_cksum(m, len)
 			ADDC(28);
 			MOP;
 			w += 16;
-		}
-		mlen += 32 + 1;
-		if (mlen >= 32) {
-			ADD(16);
-			ADDC(0);
-			ADDC(4);
-			ADDC(8);
-			ADDC(12);
-			ADDC(20);
-			ADDC(24);
-			ADDC(28);
-			MOP;
-			w += 16;
 			mlen -= 32;
 		}
 		if (mlen >= 16) {
-- 
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