Local Copy Propogation issue

[komaljai]

void ipip_push(inout headers_t hdr, in metadata_t meta)
{
   hdr.inner = hdr.outer;
   hdr.outer.srcAddr = meta.src;
   hdr.outer.dstAddr = meta.dst;
   hdr.outer.ttl = 64;
   hdr.outer.protocol = 4; /* IPIP */
   /* Assume MTU can accomodate +20 bytes */
   hdr.outer.totalLen = hdr.outer.totalLen + 20;
   hdr.outer.hdrChecksum = 0;
}

control Deparser(
    packet_out pkt,
    inout    headers_t hdr,
    in    metadata_t meta,
    in    pna_main_output_metadata_t ostd)
{
    apply {
        pkt.emit(hdr.ethernet);
	if (meta.push && hdr.outer.isValid()) {
               /* Push the ipip header */
               ipip_push(hdr, meta);
	}
    }
}

The IR representation at end of frontend looks like -

control Deparser(packet_out pkt, inout headers_t hdr, in metadata_t meta, in pna_main_output_metadata_t ostd) {
    @name("Deparser.hdr_0") headers_t hdr_1;
    @name("Deparser.meta_0") metadata_t meta_1;
    apply {
        pkt.emit<ethernet_t>(hdr.ethernet);
        if (meta.push && hdr.outer.isValid()) {
            hdr_1 = hdr;
            meta_1 = meta;
            hdr_1.inner = hdr_1.outer;
            hdr_1.outer.srcAddr = meta_1.src;
            hdr_1.outer.dstAddr = meta_1.dst;
            hdr_1.outer.ttl = 8w64;
            hdr_1.outer.protocol = 8w4;
            hdr_1.outer.totalLen = hdr_1.outer.totalLen + 16w20;
            hdr_1.outer.hdrChecksum = 16w0;
            hdr = hdr_1;
        }
    }
}

The issue is copy propogation, 'hdr' is assigned to 'hdr1' in beginning and 'hdr1' is assigned to 'hdr' back at the end, Shouldn't this be optimized?