If the address of the BEAM register file (rbx, apparently) stays constant, and the last write to that register was >5 cycles ago, the load can be speculated 5 c

If the address of the BEAM register file (rbx, apparently) stays constant, and the last write to that register was >5 cycles ago, the load can be speculated 5 cycles in advance; if the last write was <5 cycles ago, my understanding is that that gets handled by store-to-load forwarding with a latency of ~0.