--- /sys/src/cmd/cc/sub.c
+++ /sys/src/cmd/cc/sub.c
@@ -929,6 +929,10 @@ loop:
 	case ONOT:
 	case OADDR:
 	case OIND:
+	case OCOM:
+	case ONEG:
+	case OPOS:
+	case OTST:
 		n = n->left;
 		goto loop;
 
@@ -961,6 +965,8 @@ loop:
 	case OOROR:
 	case OCOMMA:
 	case ODOT:
+	case OFAS:
+	case OINDEX:
 		if(side(n->left))
 			break;
 		n = n->right;
@@ -972,6 +978,10 @@ loop:
 	case OSTRING:
 	case OLSTRING:
 	case ONAME:
+	case OREGPAIR:
+	case OEXREG:
+	case OREGISTER:
+	case OINDREG:
 		return 0;
 	}
 	return 1;