bug - divide and mod of a byte

R=r
OCL=15370
CL=15370

src/cmd/6g/gen.c

@@ -1001,26 +1001,34 @@ dodiv(int op, Node *nl, Node *nr, Node *res, Node *ax, Node *dx)
 {
 	int a;
 	Node n3;
+	Type *t;
 
-	a = optoas(op, nl->type);
+	t = nl->type;
+	if(t->width == 1) {
+		if(issigned[t->etype])
+			t = types[TINT32];
+		else
+			t = types[TUINT32];
+	}
+	a = optoas(op, t);
 
-	if(!issigned[nl->type->etype]) {
-		nodconst(&n3, nl->type, 0);
+	if(!issigned[t->etype]) {
+		nodconst(&n3, t, 0);
 		gmove(&n3, dx);
 	}
 
 	regalloc(&n3, nr->type, N);
 	if(nl->ullman >= nr->ullman) {
 		cgen(nl, ax);
-		if(issigned[nl->type->etype])
-			gins(optoas(OFOR, nl->type), N, N);
+		if(issigned[t->etype])
+			gins(optoas(OFOR, t), N, N);
 		cgen(nr, &n3);
 		gins(a, &n3, N);
 	} else {
 		cgen(nr, &n3);
 		cgen(nl, ax);
-		if(issigned[nl->type->etype])
-			gins(optoas(OFOR, nl->type), N, N);
+		if(issigned[t->etype])
+			gins(optoas(OFOR, t), N, N);
 		gins(a, &n3, N);
 	}
 	regfree(&n3);